![]() Overall very happy with the results, but still plenty of room to improve and learn. Tripod/mount is next up on my upgrade list. More importantly, I was only able to use 45 of 70 frames due to camera motion. This small sensor will give a Field Of View similar to 500mm on a full frame camera. ![]() ![]() I was able to mostly remove it in post processing by reducing the sigma clipping threshold on the negative side. The Focuser is 50. I tried unsuccessfully to remove it from the camera during the session, but eventually gave up. Williams Optics ZenithStar 61II Special Features The full-frame sensor size is approximately 36X24. If you notice a dark nebulous region near M110, it's not a new black hole, it's some sort of tiny bug that was walking across the image sensor. While most of the process was easier and produced higher quality results than before, there were a few hiccups. This time around I've upgraded to a 360mm focal length scope and an ASIAIR Pro to handle the guiding and shutter. I still like the WO 90 and 110 doublets, both within my price range but the Astronomica prices for triplets are less than half the price of a similar WO. The first was with a dslr zoom lens at around 200mm with a light pollution filter, a guide camera hooked up to my laptop, and manual control of a remote shutter with a stopwatch. The William Optics Zenithstar 61 II APO features an air-spaced doublet lens with fully multi-coated optics and an Ohara FPL-53 ED glass element for sharp. This is my second attempt to get a good shot of the Andromeda Galaxy.
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