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02-01-2010, 01:59 PM   #1
Pentaxian




Join Date: Aug 2007
Location: Madison, Wis., USA
Posts: 1,510
DP Review and Sigma 18-250 OS HSM

Responsive when focusing but soft at both ends. Image stabilization not that hot at 250. When you need it.

Drat ... I'm struggling with my older Tamron 18-250 travelers' workhorse - slow/missing focus at 250mm and/or softness. Saws back and forth trying to focus, even in bright shade, then gives up. Shift to manual, and find that the shiny weather vane loses its crispness.

I assume that both are the result of a superzoom compromise design and F/6.3.

PTX 55-300 solves both problems but calls for a lot of shifting from 17-70 to 55-300 and back.

Guess I wait for the next round of lens re-invention

02-01-2010, 02:08 PM   #2
Damn Brit
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Moved to Lens forum.
02-01-2010, 02:44 PM   #3
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Join Date: Mar 2008
Location: Quebec city, Canada
Photos: Gallery
Posts: 5,830
You know the saying : jack of all trades, master of none.

If you want a lens with amazing IQ, get a prime. With great IQ, get a good, low reach zoom. Want a jack of all trades? Be ready for comprimises. At f8 it should already improve a lot.
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