Thread: focal length
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Old 08-07-2019, 08:47 PM
poider (Peter)
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Join Date: Apr 2012
Location: Adelaide, Australia
Posts: 224
focal length
G'day
Is there a website that can tell me what focal length matched lenses....
For example, I have a 150-500mm lens and I am wondering what the equivalent telescope would be in a refractor
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