I am looking to buy a Sigma AF 70-300mm f4-5.6 DG APO Macro lens. Can someone tell me when they say 70-300mm zoom is that based on a film camera as I believe for a digital camera you need to times that by 1.4 I believe.
Thanks in advance
Christopher A. Vedros
Yes, Simon, 70-300mm represents the ACTUAL focal length(s) of the lens.
The field of view seen by your digital SLR will reduced, and will be similar to what you would get with a longer lens on a film SLR. The FOV factor depends on what camera you have. Most reduced-sensor Nikons have a 1.5x FOV factor, most reduced-sensor Canons have a 1.6x FOV factor. I think the factor for an Olympus dSLR is 2.0x.
So if I put a 70-300mm lens on my Canon Digital SLR, it will give a field of view similar to a 112-480mm lens on a film SLR.
Chris A. Vedros
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