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Time Lapse app Autofocus

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Post Options Post Options   Quote windhorse Quote  Post ReplyReply Direct Link To This Post Topic: Time Lapse app Autofocus
    Posted: 06 March 2019 at 11:36
Does autofocus function of Sony Time Lapse app set to autofocus (single shot AF) work by autofocussing (or not autofocussing) on the first exposure in the sequence then stay at that same focus for the remainder of the sequence?

I figure this may explain why a whole time lapse sequence I just tried to do with NEX6 starting in darkness and ending in bright morning light after the sun came up turned out way out of focus: ie the camera could not AF in the dark before sunrise, so focus started out wrong, and stayed wrong through the whole sequence, even though the light was strong so autofocus would have been easy for the camera to do towards the end of the sequence, because the app does not refocus once the sequence starts?

Problem is manual focus is also not easy to do in the dark before sunrise either
 



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stiuskr View Drop Down
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Post Options Post Options   Quote stiuskr Quote  Post ReplyReply Direct Link To This Post Posted: 06 March 2019 at 20:00
I've looked at a few reviews and tutorials and not one addresses that but going by your experience I'd think auto focus is locked after the first shot. According to the specs the focus modes are Single-shot AF, DMF and Manual Focus. Should be easy to test though, set up a time lapse with just a few frames dialed in and then after the first shot remove or move the subject you were focused on.
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windhorse View Drop Down
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Post Options Post Options   Quote windhorse Quote  Post ReplyReply Direct Link To This Post Posted: 07 March 2019 at 05:04
Yes absoutely right: more thorough testing required when time permits.

Meanwhile I did attempt to see if I could replicate the problem, starting a sequence in semi-darkness to run into light (from before to after sunrise) and noticed that the green focus confirmation button was blinking continuosly at the start of the sequence, indicating that the camera was not able to autofocus at the start of the sequence, probably due to insufficient light? The whole sequence was out of focus, even though by the end of the sequence, there was ample light.

Whereas in a quick follow up test that started and ended in ample light the focus was accurate.
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