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Photography Question 


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

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4/11/2007 3:22:36 AM

Christopher A. Vedros
BetterPhoto Member Since: 3/14/2005
  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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4/11/2007 7:17:06 AM

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