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ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.

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  1. Rapala

    Sigma 100-300 f/4 Bokeh/Aberration Issue

    Here's a few recent photos; 1. 1/640 f/5.6 ISO 1600 2. 1/640 f/5.6 ISO 1600 3. 1/800 f/5.6 ISO 250 The bokeh seems a bit better the farther away the background is (as it should be), but in other shots I'm still getting the distracting bokeh.
  2. Rapala

    Sigma 100-300 f/4 Bokeh/Aberration Issue

    Mike, Thanks for your input. I found the lens new on Amazon. It would seem that Pentax mounts are quite rare for this lens from what I've heard about it. TBF, The first photo (Fox Sparrow) was taken @ 1/1000 f/5.6, and the Yellow-Rumped Warbler was taken @1/800 f/4.5. I had assumed they were...
  3. Rapala

    Sigma 100-300 f/4 Bokeh/Aberration Issue

    I recently ordered and received a Sigma 100-300 f/4 DG EX to use with my Canon T4i. Focus is quick and accurate, and subjects are sharp. However I've noticed some 'nervous' bokeh in many of the photos that have a background near to the subject. With birds in flight there is not problem, but with...
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