Focal Reducer test: Celestron SCT f6.3 and 80mm refractor (2008 article)
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)
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Field of view comparisons
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Toronto Skyline 33 miles away (poor and variable viewing conditions)
80mm with no focal reducer ISO 250 @ 10 seconds
(click for larger image)
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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)
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80mm no focal reducer (exceptional conditions back in July 2007)
(click for larger image)
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Keywords:
Astrophotography,
review
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