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03-23-2011, 10:31 AM   #1
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pentax k100d

already have a 70--210 lens,seen a sigma 70-300 lens going for not a bad price, would i get any benefit,best regards.

03-23-2011, 11:14 AM   #2
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Hi og,

To see the difference in "reach" take a look at this page. I believe that you need to have Flash installed to use it, but most do.

Focal length comparison tool, Tamron USA

You haven't mentioned exactly which lenses you are talking about, so I couldn't comment on Image Quality.

Scott
03-24-2011, 06:46 PM   #3
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300mm will make a significant difference, but you should describe the exact model of each lens so you can get more comments on the merits of each lens.

Paul
03-24-2011, 09:53 PM   #4
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Your subjects will show approx 1.5x bigger (300/210) at the longest end.

I agree with tibbits to give a more accurate description of the lenses. From reading on these forums, some of the Sigma versions are better than others (some (subjective) opinions can be found on Sigma Lenses for Pentax: Zoom Lenses - Pentax Third-Party Lens Review Database ).

03-30-2011, 11:04 AM   #5
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many thanks,everyone.
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