A simple Star Test is done by focusing and defocusing a bright star in both directions: IN focus & OUT focus. This way you may check your telescope optics as well as collimation. Concentric rings should be obtained when focusing and defocusing on perfect lenses and mirrors. This video is a star test of a very bright star, Arcturus at around a magnification of 200x. A 6 mm eyepiece on a 1250mm focal length telescope yields that power. The telescope used here is a 125mm telescope, a Celestron NexStar 5SE XLT and the camera for recording was a Canon EOS 450d (Rebel XSi) DSLR. The focuser is moved back and forth during the recording of this video. This video is not about Ufo Sightings nor Nasa Imagery, nor Nibiru, Aliens, etc. It is just a visual aid to check optics quality and collimation on a telescope. Star test, Optics, Collimation, in focus, out focus, focusing, Telescope, Celestron NexStar 5SE XLT, Astronomy, Astrophotography, Astrophoto, Backyard, 2011, Canon EOS 450d, Rebel XSi, video, DSLR, Live video, Reflector, Refractor, SCT
Low Cost Aquasana Replacement Filters Cheap Chamberlain Liftmaster Remotes
0 comments:
Post a Comment