- apo refractor
The stars are sharp in the corners when used with my Sky-Watcher 100mm APO but the vignetting is bad. Difficult to calibrate out.
I am truly impressed with the Stararizona’s Apex reducer. I am using it with an apo refractor 102mm 714mm focal length, f/7 that became a much faster f/4.55 and FL 464mm. I recommend it for anyone looking a faster scope with wider field. It made perfect, the marriage between my ASI183mm and my 102. Noticeably faster, super exciting.