Closed GoogleCodeExporter closed 9 years ago
In Tv mode AutoISO raises ISO when the camera sets an exposure longer than
MaxTv; with those parameters, I would expect a constant ISO at 100, because the
camera cannot set an exposure longer than the limit, and thus AutoISO never
kicks in. And this is exactly what happened in my tests.
For AutoISO to work in those conditions, you should set a MaxTv value shorter
than the camera's limit (25 seconds, for example).
Original comment by eduardo....@gmail.com
on 12 Aug 2012 at 10:06
Did you point the camera at a bright light source during your test?
I would also expect a constant ISO 100, indeed this is what I want to happen,
but this in not the behavior i am seeing when "min Tv" is set high (25sec or
30sec), and the camera is in bright conditions. (if it is not bright then it
works as it should)
I have tested this on two cameras, both show the same behavior.
please re-test this as it is a real bug, not my imagination.
camera setting:
camera in Av Mode. lens aperture at f3.5
AutoISO
Enable Yes
Min ISO 100
Max ISO 400
Min Tv 25"
Max Av f/5.0
indoors seems fine (constant ISO 100), but with bright light (point camera
directly into a light/at the sun) it go's back to ISO 400!
Original comment by purest...@gmail.com
on 12 Aug 2012 at 1:43
Retested and reproduced!
In the context of long exposures, I assumed that a "bright light" was a lamp or
something similar, I was not expecting the sun to enter the game. But yes, when
the camera sets a very short shutter speed (1/1000 - 1/4000, for example),
400plus wrongly raises the ISO.
I'll try to fix this as soon as possible.
Original comment by eduardo....@gmail.com
on 12 Aug 2012 at 5:35
This issue was closed by revision r1424.
Original comment by eduardo....@gmail.com
on 12 Aug 2012 at 9:59
Original issue reported on code.google.com by
purest...@gmail.com
on 11 Aug 2012 at 7:09