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best scope for DLSR photography
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05-10-2019, 06:35 PM
poider
(Peter)
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Join Date: Apr 2012
Location: Adelaide, Australia
Posts: 224
So how is the focal length determined, I have a 600mm long refractor with a focal length of 600 but my sigma 150-500mm is no where near 500mm it is just over 350mm long
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