A few weeks ago, I noticed that the istDS AF did funny things in low light with my 85mm/f1.4. Occasionally, the camera wouldn't fire, even though I thought it was in focus (on a manually selected zone). It wouldn't even bother to hunt. A little while later, it would be fine. And then it would hunt on a perfectly brightly lit zone. I thought this was because of the lens.
Tried it with the 77mm LTD tonight. Worked fine for most of a 1GB card, then started doing it on the second card.
D'oh. I think I know what it is. Once the batteries are partially depleted, and even though the rest of the camera fires fine, the AF seems to be a bit sensitive to the power levels. Of course after a while the batteries recover if I go for a while without shooting.
I'm using two sets of Sony 2300mAH NiMH's. I think I might buy a few more.
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