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SD15 Autofocus Woes

Started Aug 20, 2018 | Discussions thread
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bvy Regular Member • Posts: 330
SD15 Autofocus Woes

I have a newly serviced SD15 with three lenses: Sigma 17-70 (non OS), Sigma 50mm 1.4 (non Art), and a much older Sigma 28-80 macro lens from an SA-9. I’m doing portraits up close (~6 feet) and needing the eyes to be sharp. I’m shooting at f5.6 or wider and I’m using a flash a lot of times (so shutter speeds no slower than 160 ).

Four out of five of my photos are sharp in the eyes. The others appear to be back-focused. It’s the same with all three lenses, but slightly worse with the 28-80. I’m not ready to dismiss this as a camera or lens issue. Honestly, I shoot mostly film and use manual cameras, but I’ve had to update my digital arsenal to do some senior portraits this fall.

What are some simple things I should check (settings or technique) to see if I can remediate this? I always place the AF indicator over the eyes or lips, half press, then recompose. AF is usually pretty responsive and doesn’t hunt.

Thank you.

 bvy's gear list:bvy's gear list
Sigma DP1x Olympus E-520 Sigma SD15
Sigma SD15
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