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03-23-2011, 10:31 AM   #1
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Join Date: Feb 2011
Location: kirkby-in-ashfield
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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

Join Date: Oct 2006
Location: Chicago suburb, IL, USA
Posts: 1,535
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.

03-24-2011, 06:46 PM   #3

Join Date: Apr 2007
Location: Oklahoma USA
Posts: 1,503
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.

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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Original Poster
many thanks,everyone.

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