200 to 300 mm magnification larger than 300 to 400?

Started Oct 2, 2012 | Discussions thread
Jeff_Donald
Regular MemberPosts: 300Gear list
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Re: 200 to 300 mm magnification larger than 300 to 400?
In reply to sherwoodpete, Oct 2, 2012

The lens' stated focal length by the manufacture is often less than the actual measured focal length. For example my wife owns the the Canon 100~400mm lens and when the lens is zoomed to 400mm it measure about 370mm. This is a known issue with many telephoto lenses.
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Jeff Donald
Executive Director Florida Center of Creative Photography

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