of Telescopes on     Platforms, Full Found inside – Page 356#63 Build or Buy an Equatorial Platform Using an EQ platform preserves all of the advantages of a Dob—large ... means an EQ platform, if it is built precisely and polar aligned accurately, can be used for long-exposure astrophotography ... Visits Since March 1999. Overview. Tracks for around 50 minutes. Equatorial Platforms. Figure 4-39. Alignment Tool Found inside – Page 55Telescope mounts The job of the telescope mount is to provide a firm, stable platform for the optics: the mount should ... rather than in a series of up-down/left-right steps, makes the equatorial mount suitable for astrophotography, ... An equatorial platform at one extreme of its motion, tilted about 7.5° off vertical Payload capacity is 2.5kg: more than enough for a DSLR camera and a standard lens. The Astrophotography Manual, Second Edition is for photographers ready to move beyond standard SLR cameras and editing software to create beautiful images of nebulas, galaxies, clusters, and the stars. Color Photos by Del Johnson. Long-Exposure Astrophotography The platform is only a few inches high and allows for between 30-60 minutes of tracking before the platform is . We're going to show you how to build a motorised equatorial platform able to track the sky for an extended period (approximately one hour) before you need to adjust your scope. Motorized & Computerized Equatorial Mounts. High Capacity With a weight capacity of up to 225 lbs, the EQT-150SC and EQT-225SC platforms can handle some of the biggest Dobsonian telescopes available. It was challenging back then and I feared it would get even more difficult with the platform. CloudyNights 50 ISO 3200-6400/10-30 Sec Light Frames. Found inside – Page 302Equatorial. Mode. The Celestron 4 SE telescope mount is a single arm, alt-azimuth mount that has a tripod with a built-in ... At first glance, the mount ought to do well as a portable, lightweight, platform for astrophotography when the ... with a Platform, MallinCam They are much much lighter than a typical equatorial telescope mount, and have become very popular for on the go widefield imaging. Taken by Mirko Maher and Jon Schwartz with a 28" SlipStream alt/az GoTo Telescope made by Equatorial Platforms. Get Astronomy Hacks now with O’Reilly online learning. Perhaps the greatest innovation in the Astronomy industry was the advent of the Computerized Equatorial Telescope Mount, commonly referred to as a "GO-TO" Mount. with a Platform . the astrophotography manual a practical In a few months these winter constellations will be high in the sky and well placed for astrophotography, so now is the time to do some planning. This books is not about making beautiful astronomical images; it is about recording astronomical images that are scientifically rigorous and from which accurate data can be extracted. Item Weight: 28.8 pounds. Commercial platforms that are sufficiently precise for long-exposure astrophotography (which is to say platforms built by Tom Osypowski) offer optional polar-alignment tools. My Dob is sold so I don't need the Platform any longer. Astronomy Photography 3D Printed Newtonian Telescope Print Email On . For astrophotography, the polar alignment needs to be much more precise. Don't confuse the terms "equatorial mount" and "equatorial platform". The instrument has an altazimutal mount which makes it lightweight and well suited for visual observations. Astronomy Hacks begins the space exploration by getting you set up with the right equipment for observing and admiring the stars in an urban setting. Visits Since March 1999 . at the 2010 OSP, CCD Images by Pierre Schmid and Eduard von This guide is ideal for astrophotographers who wish to develop their skills using DSLR cameras and as a friendly introduction to amateur astronomers or photographers curious about photographing the night sky. Runs off of 8 AA batteries (included). Discover (and save!)  MallinCam Among the most innovative displays on the telescope field was Tom Fangrow's "hiss" drive for his Dobsonian Reflector. The scope sits on top of the top board, which is usually another sheet of stiff plywood. THESE EQUATORIAL PLATFORMS CAN BE USED FOR ALL TYPES OF ASTRO-IMAGING WORK. Payload capacity upto 50Kgs ! Look up "equatorial platform" and you will find scads of information. Figure4-37 shows an EQ platform built by Steve Childers, underneath the rocker box of his 10” Orion XT10 Dob. Customer Quotes "All night long the tracking was spot on…tracking exceeded my expectations, and I would highly recommend it if you're in the market for a platform. This document will contain the basic design choices, sources, explanation of the containing files for my attempt at making an equatorial mount. Inspiring work, your platform is simple and it looks very good too. at the 2010 OSP The dual-axis, aluminum Johnsonian Type V platform sells for $900 and supports Dobs up to 16” or 140 pounds. A large equatorial platform for a big Dob. Figure 4-38. The controller needed to adjust tracking speed may be a separate box that is cabled to the platform, or it may be built into the platform base. Found inside – Page 87Windows platforms come and go, I quickly moved from XP to Windows 7, skipping Vista and resisting the tablet temptation of ... TheSkyX is developed by the same company that manufactures the exquisite Paramount equatorial mounts and not ... Found inside – Page 258If the object that one wishes to image, say Jupiter, was chosen to slew to, then setting up the mount takes essentially no time apart from setting the tripod platform and the head horizontal. If using an equatorial mount, ... Nearly all astrophotography requires long exposure imaging: shutter speeds measured in seconds and whole minutes as opposed to the fractions of a second used in conventional photography. Sky Watcher EQ6-R Equatorial Telescope Mount. The equatorial platform was essential in permitting me to perform imaging with a CCD camera, and I have used it with my 8" Newtonian as well. A video of equatorial platform being set up at the 2010 Orange Blossom Star Party. Drift Method. An EQ platform is simple in concept. The white box on the left contains the electronics that control the speed of the platform’s motion. In short, it's as easy or difficult as with a "normal" German equatorial mount. PRIME FOCUS PHOTOGRAPHY through the main telescope requires a fine Typical Image Acquisition Technique. A telescope wouldn't be really useful without something to hold it steady. There is also a Yahoo group dedicated to EQ platforms which has loads of helpfull information, as well as helpful people. Terms of service • Privacy policy • Editorial independence, http://astronomy-mall.com/regular/products/eq_platforms/, http://groups.yahoo.com/group/eqplatforms, http://www.atmsite.org/contrib/Shaw/platform/, http://home.wanadoo.nl/jhm.vangastel/Astronomy/Poncet/e_index.htm, http://home.att.net/~segelstein/don/platform-1.html, http://members.tripod.com/denverastro/dsdfile/dspfile.htm. The hand control gives a backlash-free fine guiding motion in declination. Provides easy to understand information and guidelines about the design and construction of binoscopes Focusing on both homemade and commercial products, this book provides the reader with simple and straightforward information about the ... Review, A They are used to give equatorial tracking to any device sitting on them, from small cameras up to entire observatory buildings. Previous Images of the Month. Equatorial Platforms. Phone/Fax 530-274-9113.    Updated 8/24/21, IMAGING Type: Motorized Equatorial Mount. Found inside – Page 253... an equatorial platform, unless it was computerized, does not have motorized “GOTO” functionality. When it comes to field rotation, a field derotator should be considered; however, it is only needed for long exposure astrophotography ... Orion […] View all O’Reilly videos, Superstream events, and Meet the Expert sessions on your home TV. Written by an amateur astronomer and experienced hobby engineer, this wide-ranging book presents tried and tested ideas from the simplest of gadgets to advanced projects. The Dob Knob can be a pain to smoothly center the object. ! We hold monthly meetings,conduct public star parties and provide community educational talks. Because an EQ platform tracks equatorially rather than alt-azimuthly (as, for example, a standard fork mount without an EQ wedge or a Dob Driver does), there is no field rotation during tracking. Picture Gallery From the author of Getting Started: Long Exposure Astrophotography and the Messier Astrophotography Reference comes a book showing you how to produce wonderful astrophotos without the astronomical costs normally associated with the hobby. His advice, tips, and solutions aid the user in getting the most out of the Star Book Ten system in observing sessions. This book is for anyone who owns, or is thinking of owning, a Vixen Star Book Ten telescope mount or its predecessor. Single-axis drive, with variable speed knob on side of battery compartment. But for small and mid-size Dobs, those 12"or less, many astronomers think an EQ platform is the best single upgrade you can make. I am looking to do webcam astrophotography with my 6 inch Orion dobsonion, as and equatorial, goto telescope is way, way out of my budget,and I realize that motorizing my dobsonion would be easy and cheap but it's no good for long exposure times and looking around I can across the EQ platform, I look into buying one but I refuse to pay three times as much as my telescope to get a piece of . Platform weighs only 17 pounds. This is the perfect book for amateur astronomers who are about to invest in a new Schmidt-Cassegrain or Maksutov telescope, or for those who already have one and want to get the most out of it. The Johnsonian Type VI platform is an entry-level model that sup-ports Dobs up to 10” or 60 pounds. O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers. Buy yourself a plain used ten inch dobsonian, then either make or purchase an equatorial platform. ascension slew, facilitates centering objects and sweeping an area at Equatorial wedge for Celestron NexStar 6/8SE and Evolution Alt-Az mounted computerized telescopes Enables long exposure astrophotography and autoguiding by tilting the telescope s azimuth into an equatorial platform allowing it to track an arc around the polar axis. Materials - 1,200x600mm sheet of 18mm plywood (this is enough for parts . One of the dobs runs OnStep, but obviously won't be tracking when on the platform. Sky Watcher EQ6-R Equatorial Telescope Mount. Pioneered by Meade in the 1990's the "GO-TO" Equatorial Mount revolutionized the way we do Astronomy. Article in Sky & Telescope, September 1985. Stellarvue 80 mm Guide Scope. A remarkable photo of the Pillars of Creation. For beginner to intermediate planetary and deep space imagers. Tools - Jigsaw, router, hacksaw, drill and bits, plane, spanner, Allen key, screwdriver. When the EQ platform reaches the end of its travel, you simply reset it for another hour’s worth of tracking. your own Pins on Pinterest Equatorial camera mounts are designed to align with the polar axis of the night sky so you can take long-exposure images that are free of star trailing. We Buy Back Platforms! WORK. North-South distance between platform's feet:18 inches. To overcome this flaw in alt-az-mounted telescopes, Cheng-Yang designed and built a field derotator that removes this degree of freedom and enables alt-az telescopes to become astrophotography platforms. Check out this guys blog,he gets awesome results. Now you can accurately polar align your Equatorial Platform in a minute or less. I built the tracker shown here based on one recently made by Ohio telescope maker Ed Jones and on a platform built by Sky & Telescope 's Dennis di Cicco in the mid-1980s. They are used to give equatorial tracking to any device sitting on them, from small cameras up to entire observatory buildings. Built around the Star Adventurer 2i mount, the Star Adventurer astrophotography mount is a high precision, portable, and stable celestial tracking platform for sidereal, solar, and lunar tracking. It may look like a digital camera, but the Vixen Polarie is actually a compact equatorial star tracker platform. "Got the chance to set up my platform under the sky, it was an easy setup and tracked well from the . Have a closer look at the TEPP! Found insideChapter 9 Equatorial Fictions Chuck Shaw Since the late 1970s, equatorial platforms have permitted Dobsonian telescopes ... primarily for visual observing, simple us North sector South sector astrophotography is possible if the platform. These are not necessarily the same objects that are the most spectacular or intriguing visually. The camera reveals different things and has different requirements. E-Mail: tomosy@nccn.net. 18" x tangent 1.4 degrees = .44" Changing my platform 4 degrees would probably require two much longer south foot bolts and the spacing added would be 1.26". Found inside – Page 104... the celestial pole , and the platform to which the camera is attached is driven by an electric motor so as to move through right ascension , parallel to the celestial equator . These mounts are therefore known as equatorial mounts . Found inside – Page 102For Camera and Telescope mode, mounts become very important, as they must be able to hold your platform rock steady, ... but there are two basic types – altitude and azimuth mounts (alt-az for short) – and equatorial mounts. Review: 20" f3.0 SpicaEyes Telescope on a Platform, Customer Equatorial Platforms 15736 McQuiston Lane, Grass Valley, CA 95945 - 530-274-9113. A smart platform for Dobsonians up to 100 kg! Therefore, SKYMEMO S equatorial wedge is equipped with an U3/8 screw both on the upper-side and the down-side. About Our Platforms. Sky Watcher HEQ5 Equatorial Telescope Mount. Obsession 22 Inch UC Telescope. Star-Drift Method: Summary of the Star Drift Method of Polar Alignment. Equatorial Platform by Gregg Blandin Crossbow EQT-100 and EQT-200. Yes, you can. An equatorial platform,or EQ platform for short, is a squat, flat, motor-driven table that sits underneath the Dob base and gradually pivots the scope at the exact rate needed to counteract the apparent motion of the stars. Orion Sky-View Pro Equatorial Telescope Mount. They are often used with altazimuth mounted . 2. The Astrophotography Manual is for those photographers who aspire to move beyond using standard SLR cameras and editing software, and who are ready to create beautiful images of nebulas, galaxies, clusters, and the solar system.   Picture Gallery The NINA imaging software is an open source astrophotography sequencing suite allowing users to set up an imaging sessions that contain sequences of hardware control actions and exposures. Howard Astronomical League(Columbia, MD USA) Astrophotography Links HAL is an amateur astronomy club located in Howard County, Maryland. The bearing dimensions are calculated for the specific latitude at which the platform is to be used. Also at your fingertips is a fast slew which, together with the right     Polar Exposure of each negative was 7 minutes. Celestron CG-4 German Equatorial Mount. Equatorial platforms provide a way to also use large Dobsonian telescopes for astrophotography. ASTROPHOTOGRAPHY WITH AN EQUATORIAL PLATFORM. EQStar is a equatorial mount control system designed to automate the control of the equatorial mount. The answer is the equatorial platform or equatorial table, which serves as a tracking platform for the Dobsonian telescope. Astronomy is a science as old as the stars! This was also made for a school course "open design". Scanning and image processing by Tony and Daphne Hallas at Astro Photo. It will track the sky with motion in just the right ascension axis. Take O’Reilly with you and learn anywhere, anytime on your phone and tablet. Category: Astrophotography. Equatorial Platform. Dec 18, 2019 - This Pin was discovered by Tom Luczkowski. Our Equatorial Platforms are precision tracking devices for Dobsonian Telescopes. Like any equatorial mount, an EQ platform must be polar aligned if it is to track stellar motion properly. You can do an eyeball alignment on Polaris, or use a compass (adjusting for magnetic declination, of course) to align the platform accurately enough for visual use up to 300X or more.  Image of the Month Updated Payload capacity is 2.5kg: more than enough for a DSLR camera and a standard lens. So how about astrophotography with the platform? Equatorial Platform Bill of Materials. ES 82* 11mm, 18mm 2", ES 68* 24mm, 6mm, 25mm Ortho. Using an EQ platform preserves all of the advantages of a Dob—large aperture; easy, intuitive motions, and so on—while adding all of the benefits of a driven equatorial mount. Found insideASTROPHOTOGRAPHY OUTFIT EQUATORIAL PLATFORMS 2 . FOR DOBSONIAN TELESCOPES OF ALL SIZES ZENIT TE ZENIT 12XP O • Mechanical camera body ( with " B " & " T " settings ) Quality 58mm f / 2 lens • Basic camera adapter ( for prime - focus or ... Found insideUpdate , A State of the Art Poncet An Interference Test for Schmidt Corrector Equatorial Platform , Making an Observatory Plates ... The SchalckTesters , Guiding for Astrophotography , Newtonian , Highlights of Stellatane 1987 . It just doesn’t look like a standard GEM or fork equatorial mount. Figure 4-37. An Introduction to Field Derotation Altitude-azimuth (alt-az) telescopes cannot be used for long exposure astrophotography. Between the two boards sit the north and south bearings, a small motor, and some sort of drive mechanism that tilts the top board (and scope)to track the stars. This was also made for a school course "open design".   Platform Pricing Found inside – Page 185Typically the platform consists of two parts: a wooden ground board and a pivoting table, to which the board is attached. ... Typically, commercial equatorial platforms can accommodate latitudes from 0 to 55 degrees north or south. © 2021, O’Reilly Media, Inc. All trademarks and registered trademarks appearing on oreilly.com are the property of their respective owners. I have seen a few for $150 to $200, but apparently the motor vibrations make for poor photographs. The frustration this could instill might, and indeed has, caused some potential amateur astronomers to give up and pursue other hobbies. With this book you can now assemble, set up, adjust and use your equatorial mount with confidence. In practice, that means that most platforms are made for the owner’s specific latitude, but are usable anywhere within 350 miles north or south of that location. An equatorial platform gets the best of both worlds. My wife and I spent a good portion of this time driving around the beautiful American Southwest and the many awesome parks on and around the Col… That drive wheel bears against and drives the curved bearing surface connected to the top board, upon which the scope rests. The equatorial platform pivots on the curved bearing shown in Figure 4-37, as well as a similar bearing at the far end of the platform, not visible in the figure. Found inside – Page 391EQUATORIAL MOUNTING : a method of supporting a telescope so that the tube pivots on two perpendicular axes , one of which is parallel to the earth's rotational axis ; a necessity for long - exposure astrophotography ; a convenience for ... Comment of the Month This is the third edition of Phil Harrington's popular and comprehensive guide to astronomical equipment, written for both new astronomers as well as experienced amateurs. Both of these come highly recommended by their owners, but neither is inexpensive. A guide to viewing stars, the moon, planets, meteors, comets, and aurora through binoculars. Comment of the Month, Astrophotography 5 seconds, even. Slew Control (paint matching your telescope) Thanks for sharing this awesome work! Answer: For astrophotography, an equatorial mount is almost mandatory. Equatorial Platforms Phone/Fax 530-274-9113 E-Mail: tomosy@nccn.net. The only downside is that a Dob doesn’t track the motion of the stars. EQUATORIAL Look up "equatorial platform" and you will find scads of information. Image Galleries. Phone/Fax 530-274-9113. For anyone who has ever dreamed of exploring the heavens with a telescope. Kenko SKYMEMO S portable tracking platform deserves a fully accessorized good ally to be the best combo for your astrophotography or star-scape shooting sessions. Celestron CG-4 German Equatorial Mount. Orion […] But first, what is an equatorial platform?This device will let you observe an object for several minutes or take photos of the night sky without having to … These platforms are an inexpensive way to emulate what a equatorial mount does. Equatorial Platform for the North: In this Instructable, I will show you how I designed an equatorial platform for my telescope. Comet 17P/Holmes. Equatorial Platforms. If you don't mind some drive train slippage when manually moving the scope and you have a clutch in the drive train a direct drive may work with a small motor and small drive wheel. This type is perfectly ok for visual observing, but is not suited for astrophotography. Because the scope simply sits on top of the EQ platform rather than being attached to it, the range of motion is necessarily limited to prevent tipping. The difference is, when you stop moving the Dob, it begins tracking and the object in the eyepiece remains centered rather than drifting out of view as Earth rotates. It doesn't require any driven mount.   Some EQ platform designs provide motorized rewinding, which takes a couple of minutes. Personal Growth Through Photography The emphasis of this methodology is going deeper within, through photography as a form of art. It can be used in «stand-alone mode» or «control mode» (from PC or mobile device). THESE EQUATORIAL PLATFORMS CAN BE USED FOR ALL TYPES OF ASTRO-IMAGING for great Dob tracking. With new tech (Stepper Motors redaly available that are used in 3D printing) their should be easier ways now to build a platform to place a Dob on their. HD15 Home Dome. 50 ISO 3200-6400 Bias and Dark Frames. Equatorial wedge for Celestron NexStar 6/8SE and Evolution Alt-Az mounted computerized telescopes. Just attach the tool to the south end of your Platform, look through the viewfinder, and . The equatorial platform was essential in permitting me to perform imaging with a CCD camera, and I have used it with my 8" Newtonian as well. The stable equatorial platform for Dobsonian telescopes offers precise tracking and variable latitude adjustment. It features unmatched stability and smoothness of motion. Orion Sky-View Pro Equatorial Telescope Mount. A telescope wouldn't be really useful without something to hold it steady. The Bubble Nebula. http://www.johnsonian.com) and Tom Osypowski(http://astronomy-mall.com/regular/products/eq_platforms/). This second edition includes substantial new material throughout, including the latest findings from the New Horizons, Rosetta, and Dawn space missions, and images from professional telescopes such as the Hubble Space Telescope and the ... of Telescopes on     Platforms guiding motion in declination as well as right ascension. Most EQ platforms tilt from about -7.5° through vertical to +7.5°. For visual use, a rough polar alignment works fine. See Equatorial Platform Dob Tracker Drive Design The amount of force /power required to drive the scope is related to the amount of out of balance. These platforms are an inexpensive way to emulate what a equatorial mount does. Commercial platforms that are sufficiently precise for long-exposure astrophotography (which is to say platforms built by Tom Osypowski) offer optional polar-alignment tools. For small Dobs, this may actually be welcome. ♦ Deep-sky astrophotography (nebulae, star clusters and galaxies): This amateur astronomy project has proven to be a learning experience that I enjoyed in my free time, and I will continue to work to get this system to produce a picture with my Canon camera - hopefully someday soon! Visits Since March 1999 . The purpose of this AstroBin is the answer." "AstroBin is by far the most accessible astrophotography image hosting platform around. During any given exposure, if the subj. For beginner to intermediate planetary and deep space imagers. I am not expecting much - I'd be thrilled with 10 second subs. Total exposure was 20 minutes, with 10 second unguided subs. In this book I describe my way of overcoming these problems.The benefit of open source software is not only the reduction of the financial burden. Platform Technology. The Orion Sirius is a good mount for a small 65mm or 80mm refractor.   Platform Accessories  MallinCam There are mainly 3 methods to do astrophotography using a Dobsonian telescope: Drift method, Driven method, and equatorial approach method. Images by Tom Osypowski. Astrophotography with a Platform MallinCam Imaging MallinCam at the 2010 OSP Image of the Month Updated 6/15/21 LINKS TO OTHER PRODUCTS: Equatorial Platforms . This document will contain the basic design choices, sources, explanation of the containing files for my attempt at making an equatorial mount. You can buy a commercial EQ platform or build your own EQ platform from scratch. Written by Stuart Parkerson on July 31, 2020. (Well, all but one; the Dob is still an altazimuth scope in terms of motions, which means you can’t use the old EQ guys’ trick of locating a bright object and then using the RA or declination slow motion controls to repoint the scope to a dim object on the same RA or declination line.)     Built-in Battery Our Platforms E-Mail: tomosy@nccn.net. You’ll need to calculate dimensions, center of gravity, bearing curves, and so on for yourself, but there are spreadsheets and other tools available to help with all that. These products provide tracking (on one axis only) for your DSLR or in the case of heavier duty versions for a small refractor too. At least one commercial platform, the Johnsonian Type V, is adjustable for latitude within a wide range. At first glance the device looked like some sort of Poncet platform, but actually it is much simpler. Long exposure Even 10 minutes of precise tracking is more than enough for anyone doing long exposure photography. Markus Hagi, Customer Last year it occurred to me that I could also use the equatorial platform with an 11" S-C tube assembly if it were held in a Dobson-type altitude bearing fixture. Guiding was done with the Platform's hand control through a separate guide scope. The telescope was a 16" f5 Dob on a Dual-axis Equatorial Platform. Last year it occurred to me that I could also use the equatorial platform with an 11" S-C tube assembly if it were held in a Dobson-type altitude bearing fixture. NINA stands for Nighttime Imaging 'N' Astronomy Software and it offers . You we'll be contacted soon! Combined with Meade's optional 670011 dual axis motor drives, the LX70 German Equatorial mount becomes an imaging platform ideal for high-performance observing or astrophotography. Visits Since March 1999. Sky Watcher HEQ5 Equatorial Telescope Mount.     Cordless   The Awesome Aluminum Platform Equatorial Platforms. The second type of telescope mount is an equatorial mount. Regardless of shooting with a DSLR, mirrorless camera, a backyard telescope, or a deep-space observatory, AstroBin is the place to be." What is a German equatorial mount? Orion StarShoot Autoguider. Today we are going to present to you a list of the 5 best equatorial mount for DSLR astrophotography. Here is a photo of the 17.5 inch Dobsonian telescope on my new equatorial platform. An EQ platform serves as an equatorially mounted table for the telescope, which is . This platform has a conical section that allows it to track like a polar-aligned equatorial mounting, although the maximum amount of tracking time is limited before it has to be reset. When you use an EQ platform, you continue to point the Dob normally, moving it in altitude and azimuth to locate objects. The following is the bill of materials for the equatorial platform report. Found inside – Page 217The unit comes with a stainless steel tripod with 1-in. diameter legs, together with a metal platform and metal hinges that render ... When doing astrophotography with an equatorial mount, the image does not rotate in the focal plane, ... Most platforms, commercial or home-built, are set for one specific latitude, although you can adjust them to ±5° or so by shimming up the north or south end. Known generically as a barn-door tracking platform, it's easy to make and works well for camera-and-lens astrophotography. I created this equatorial platform to motorize my Strock 250 telescope. How to Build an Equatorial Mount for Long Exposure Astrophotography: Last Fall (2011) I took full advantage of the fantastic sabatical policy where I am employed. They are true equatorial mounts, though at first glance that is hard to believe. If you’re comfortable with the idea of building a platform from scratch, you can probably do so for $150 to $200 in materials and two or three weekends’ work.

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