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Focal Reducer test: Celestron SCT f6.3 and 80mm refractor (2008 article)

May 14, 2013  •  Leave a Comment

 

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)
 
FlatsComparison
Field of view comparisons
 
FOVComparison
Toronto Skyline 33 miles away (poor and variable viewing conditions) 
80mm with no focal reducer ISO 250 @ 10 seconds
(click for larger image)
 
TO_Skyline_80mm
 
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)
 
TO_Skyline_80mm_f63
 
80mm no focal reducer (exceptional conditions back in July 2007)
(click for larger image)
 
33 Miles Away

 

Keywords: Astrophotography, review

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