I've noticed before with my Olympus 4/3 lenses that many telephoto lenses of equal focal length do not give equal magnification of a given subject at equal distance - my 75-300 @ 300mm was as near as I could estimate to my 300mm f2.8. However my Leica 14-150mm @ 150mm gave noticeably lower magnification than the 75-300 @ 150mm. Now I have discovered that my Canon 55-250mm STM @ 250mm produces considerably greater magnification than the Tamron 16-300mm @ 300mm!
I've yet to compare both plus the 400mm f5.6 L with my Sigma 150-600mm Sport which will be interesting. It appears that what is "written on the tin" is not always what's in it, so who can we trust and where can we find out the true focal length values of a lens? Not the manufacturer's info obviously!
David
I've yet to compare both plus the 400mm f5.6 L with my Sigma 150-600mm Sport which will be interesting. It appears that what is "written on the tin" is not always what's in it, so who can we trust and where can we find out the true focal length values of a lens? Not the manufacturer's info obviously!
David
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