Focal Reducer test: Celestron SCT f6.3 and 80mm refractor (2008 article)
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Focal Reducer Test (2008)
Using the Celestron SCT f6.3 focal reducer on the Sky-Watcher Equinox 80mm refractor
80mm no reducer = 500mm lens @f6.3
80mm with the reducer = 333mm lens @f4
Connection: Unscrewed Orion 2in prime focus adaptor and put the Celestron f6.3 reducer in between.
Flat field (increased contrast)
Field of view comparisons
Toronto Skyline 33 miles away (poor and variable viewing conditions)
80mm with no focal reducer ISO 250 @ 10 seconds
(click for larger image)
Toronto Skyline 33 miles away (poor and variable viewing conditions)
80mm with Celestron SCT f6.3 focal reducer ISO 250 @ 5 seconds
(click for larger image)
80mm no focal reducer (exceptional conditions back in July 2007)
(click for larger image)
Keywords:
Astrophotography,
review
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© Kerry-Ann Lecky Hepburn