With a very sturdy and rigid mount design, shaking as well as miss-alignment while observing deep space is a minimal to non-existent problem. Don’t let its massive size fool … If a star leaves a straight trail, you are looking at errors in both axes. More short exposures or fewer long exposures – Which is better? I don’t want to shoot too low because I am now competing with the Earth’s atmosphere…but too high of an elevation, I find the azimuth drive doesn’t track as well. It's certainly one to show off at a star party. On a night of good seeing, we found the optics of the scope gave us well-contrasted views of Jupiter and the Moon. Setting up the Go-To requires a two-star alignment process. Now, do the same thing with another friend but this time show them one of your pictures while doing it. Of all the telescopes listed here, the Skywatcher S11840 Dobsonian has the largest aperture at 16, followed by the Zhumell Z12 & SkyWatcher S11820 GoTo Dobsonian … Your field will have rotated 1.67 x 15 degrees = 25 degrees! Second, let’s not tell people what their limitations are. Total time for tear-down and setup is about 25 min. A fair amount of the assembly time was spent attaching the nine 1kg counterweights, which help balance the head unit that houses the secondary mirror. I then use PixInsight for debayering, dark/flat/bias calibration, image registration, image integration (stacking), and image post processing. You’ll see the reaction is completely different! The optics are outstanding. Many folks out there (I call these folks the “naysayers”), including formal and professional sites, will tell you Dobsonian scopes cannot do astrophotography. Experiment, take notes, try different techniques and combinations of techniques and tools. Pictures allow us to carry our hobby with us and share its joys with others. Its objective lens was perhaps 1 inch across. For Canis Major to appear to move from below Orion to above Orion, the whole scene had to have rotated approximately 180 degrees. Refer back to your first sub and compare it to the most recent sub. It fills the entire field of view and many of its colors are easily seen. First, what is AP? You can do this by visually aligning stars within the field of view. Now, rotate your camera such that the live preview (or a test sub) closely matches the first sub taken. But I also think we are motivated by the following: sharing the love and fascination of the hobby with others. How to overcome these challenges? Where field rotation is a problem is during exposures. Read honest and unbiased product reviews from our users. 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. Simply put, field rotation causes objects to form arcs much like star trails. You can view more of this scope’s images at: importantly, develop your own! They’re simple to setup, easy to operate and provide excellent value for the aperture size. Alt/az mounts, however, track in both axes at the same time hence the probability of a bad frame due to a tracking error just about doubles. This equates to 15 degrees per hour or .125 degrees every 30 seconds. Many faint galaxies can be viewed through my Dob whereas they remain invisible in his SCT. With excellent light grasp, point-and-view ease of use, convenient portability, and a low price, the XT6 Classic Dobsonian reflector should be on the top of any beginner’s telescope wish-list. Star testing showed some minor differences either side of focus – possibly arising from uneven cooling of the mirror, which is substantially thicker at the centre than at the edges. The scope can be completely … 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. 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. Generally speaking, the maximum exposure time to minimize and overcome the effects of field rotation is 30 seconds. Also the physical construction of the unit is … I can get it in and out of my Chevy Venture when I go to star parties but anything bigger would be a no-go. That equates to 100 minutes of imaging…or 1.67 hours. In summary, AP with a Dobsonian telescope, including DSOs, is indeed very doable! I occasionally use Topaz for additional noise reduction. Let’s not quell growth in this hobby by setting limits for people on day one by telling owners or soon to be owners of Dobs, “You can’t do astrophotography.”. During exposures, the field rotation effects are being captured by the sensor! My typical video processing: convert to AVI (if needed), process video in AutoStakkert (stack video frames), and pull out details using wavelet layers in RegiStax. A friend of mine with an 11-inch Schmidt-Cassegrain (SC) has told me there is no comparison between the two scopes. The ground board is quite bulky, and slightly larger and heavier than perhaps it could have been. The XX16g’s innovative design features enhance the appeal of owning a large Dobsonian. 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. If that is the case, then we could call any type of scope (Mak, refractor, SC, astrograph) mounted on an alt/az mount a “Dobsonian.” The point being, the terms “Dob,” “Dobsonian,” “alt/az mount,” are all, generally speaking, synonymous.
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