Thread: SkyWatcher DOB comparison
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Old 20-10-2015, 10:26 AM
zumka (Daniel)
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Join Date: Dec 2008
Location: East Bentleigh, Victoria
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SkyWatcher DOB comparison
Hi Everyone,

I was comparing 3 Skywatcher BK DOBs and found interesting difference with the F/Ratio 10" - F4.7 , 12" - F4.9, 14" - F4.5.

I know this is a silly question but why 10" has lower F/Ratio than 12"

See the attached comparison image.
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