Sky-Watcher 0.85x Focal Reducer/Corrector for PRO 120 ED APO Telescope

hye-won I'm Martin and welcome to another great edition for astronomy for beginners and today I'm going to do a video guide on how to adjust the air gap of your DCD between your forceful juicer or comb or corrector or any other optical attachments now the reason why I'm doing this video guide is there's a lot of us that will do a lot of imaging using si CDs and dedicated cameras and DSLRs and you probably find that you've come across this quite a few times and usually when you have a common corrector or fourth reducer or field flattener usually we use these are optical devices to eliminate a certain artifacts in our images particular like Komal corrector for example a common character is used with in conjunction with a Newtonian telescope to eliminate as much of the comic feeling or the coma around the field of view of the stars so that's why we put a coma corrector in conjunction betwe