Field rotation is rarely noticeable during normal viewing but is certainly an issue for AP. The Orion SkyQuest XT6 Classic Dobsonian telescope is the best telescope for beginners as it can open up the night sky for you and your entire family. For Canis Major to appear to move from below Orion to above Orion, the whole scene had to have rotated approximately 180 degrees. Dobsonian telescopes are great because you get a lot of aperture for your money. I think part of the reason is the “hunt.” Knowing an elusive and difficult target is out there and we hope to capture it on “film” drives us into the bitter cold night after night. It comes with a 2-inch, dual rate (11:1) Crayford focuser. In summary, AP with a Dobsonian telescope, including DSOs, is indeed very doable! But what if you also want Go-To ability and a scope that fits easily in your car so you can travel with it to darker skies? More subs will produce a better result. Or some will use the term “not ideal for astrophotography (AP) other than planetary”. I often times stop imaging, recenter the target, and start imaging again. Photos showed exactly what is packed in each box and give comprehensive step-by-step assembly and operating instructions. Dobs since then have morphed quite a bit; truss tubes, outstanding optics, GoTo and tracking capabilities, etc. Happy hunting! The scope comes with a true parabolic mirror (versus a spherical mirror). And remember, keep the target centered in the field of view during the entire imaging session. How to overcome these challenges? Astro Publishing Ltd, registered as a limited company in England and Wales under company number: 12023963. An easy way to visualize field rotation is to think about the following: when Orion rises in the east, Orion’s trusty hunting dog, Canis Major is below Orion and has yet to rise. It fills the entire field of view and many of its colors are easily seen. A lighter, less overly robust head would have eliminated this task and saved further weight. Read honest and unbiased product reviews from our users. The tracking and GoTo capabilities are not unlike other mounts. I almost always do some bit of post processing in Photoshop. I’ve imaged the moons of Uranus as well as quasars with this scope and yet I know folks with the same scope still struggling to image planets. Its objective lens was perhaps 1 inch across. On a night of good seeing, we found the optics of the scope gave us well-contrasted views of Jupiter and the Moon. The first we eluded to already, keep your exposures to 30 seconds or less. But most importantly, develop your own! The cameras I use are the ZWO ASI120MC, Sony QX-1, and Atik 420. This equates to 15 degrees per hour or .125 degrees every 30 seconds. An increase in the number of subs (often referred to as light frames) does several things for us. Suppose you want to shoot 200, 30 second subs of the Horsehead Nebula. The ground board is quite bulky, and slightly larger and heavier than perhaps it could have been. You can tell if one or both axes are off when reviewing frames (subs, frames, lights, are all synonymous) prior to processing. The Orion SkyQuest XT6 Classic Dobsonian … I then use PixInsight for debayering, dark/flat/bias calibration, image registration, image integration (stacking), and image post processing. For a given dollar amount, Dobs have a greater light collecting ability. Now let’s talk specifically about astrophotography with a Dobsonian. Experiment, take notes, try different techniques and combinations of techniques and tools. Explore Scientific 16-inch truss tube Dobsonian Well, it’s the alt/az mount. You can use the motors to automatically move to new objects or you can release the friction clutches and push it most of the way before finishing off with the motorised Go-To. Whichever method you use, the accuracy seems to be the same and when you have found the target, wherever you’re pointing in the sky, the motors automatically continue to follow it. I own an Orion 16-inch GoTo Dobsonian and as the name implies, it is a standard GoTo scope with the type of hand controller most of us are familiar with. Some field rotation effects can be removed during the stacking process however it still leads to poor image quality for longer exposures. We found the whole Go-To system to be well-behaved and relatively simple to use. Image 2 shows rejected pixels during the image registration process. Orion SkyQuest XX16g Dobsonian review Choose your book when you subscribe to BBC Sky at Night Magazine today! You can actually see how the “frames” rotate about one another. I also purchased the optional shroud to keep stray light from entering the bucket.

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