I use an SBIG STL 11000M self-guiding CCD camera with an internal filter wheel. The filter wheel contains Baader Planetarium LRGB and H-alpha filters. I usually use a focal reducer to increase the photographic speed of the system. For years, I used an Astro Physics 0.75x .focal reducer. It yields a focal ratio of f/8.3 but is only a reducer, not a corrector, and leaves the coma inherent in Schmidt-Cassegrain telescopes in the image corners. Recently, I began using a Starizona SCT Large Format (LF) reducer/corrector. It yields a focal ratio of around f/7.5, depending upon what else is in the imaging train (see below) and corrects the SCT coma all the way to the corners of the STL's large format chip. You can tell which reducer may have been used for a particular image based on the f/ratio listed after the image's exposure data. 

When possible, I use the SBIG AO-L adaptive optics device. It corrects guiding and seeing errors up to 10 times per second, yielding sharper images but it will typically achieve only 3 to 8 corrections per second. The Compustar mount has a worm gear drive with substantial periodic error which would yield trailed stars but, unlike most modern drives, has no provision for periodic error correction. The rapid corrections of the AO-L permit guiding that is equivalent to that obtained with the most expensive precision mounts. However, It requires bright guide stars (the brighter, the faster the correction rate achieved), which are sometimes not available for a particular target. That is more of a problem when using the H-alpha filter, which dims guide stars considerably.