A2 P exposure bug: a hypothesis.

fotog said:

I was playing around with my A2 this afternoon, watching the camera
keep the aperture stuck on 7.1, and then something occured to me.

I have the lens wrung out to 200mm. First, as I swing the camera
towards brighter light, the aperture stays at 7.1 while the shutter
speed continues to shorten. All well and good, the idea is for the
camera to keep the lens in the sweet spot at 7.1.

Then I swing the camera towards darker areas, and again, with the
aperture staying at 7.1, longer and longer shutter speeds are being
selected. The speed gets to 1/200, but it doesn't stop there. And,
of course, that appears to be the problem, me thinks that maybe it
should allow the aperture to change now, and allow the shutter
speed to stay at 1/200 sec, in order to stop handheld blur. But
sadly no, the aperture stays locked 7.1, and the shutter gets
longer and longer, until... hey, at 1/60 second, the camera snaps
out of it and finally adjusts the aperture.

It occurs to me that the bug might be that the camera expects the
AS to be on. And in that case, we would continue to get good
handheld results right down to the 1/60 sec, with the lens zoomed
out to 200mm.

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fotog said:

I was playing around with my A2 this afternoon, watching the camera
keep the aperture stuck on 7.1, and then something occured to me.

I have the lens wrung out to 200mm. First, as I swing the camera
towards brighter light, the aperture stays at 7.1 while the shutter
speed continues to shorten. All well and good, the idea is for the
camera to keep the lens in the sweet spot at 7.1.

Then I swing the camera towards darker areas, and again, with the
aperture staying at 7.1, longer and longer shutter speeds are being
selected. The speed gets to 1/200, but it doesn't stop there. And,
of course, that appears to be the problem, me thinks that maybe it
should allow the aperture to change now, and allow the shutter
speed to stay at 1/200 sec, in order to stop handheld blur. But
sadly no, the aperture stays locked 7.1, and the shutter gets
longer and longer, until... hey, at 1/60 second, the camera snaps
out of it and finally adjusts the aperture.

It occurs to me that the bug might be that the camera expects the
AS to be on. And in that case, we would continue to get good
handheld results right down to the 1/60 sec, with the lens zoomed
out to 200mm.

Click to expand...

LeifShutter said:

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lhomer said:

fotog said:

I was playing around with my A2 this afternoon, watching the camera
keep the aperture stuck on 7.1, and then something occured to me.

I have the lens wrung out to 200mm. First, as I swing the camera
towards brighter light, the aperture stays at 7.1 while the shutter
speed continues to shorten. All well and good, the idea is for the
camera to keep the lens in the sweet spot at 7.1.

Then I swing the camera towards darker areas, and again, with the
aperture staying at 7.1, longer and longer shutter speeds are being
selected. The speed gets to 1/200, but it doesn't stop there. And,
of course, that appears to be the problem, me thinks that maybe it
should allow the aperture to change now, and allow the shutter
speed to stay at 1/200 sec, in order to stop handheld blur. But
sadly no, the aperture stays locked 7.1, and the shutter gets
longer and longer, until... hey, at 1/60 second, the camera snaps
out of it and finally adjusts the aperture.

It occurs to me that the bug might be that the camera expects the
AS to be on. And in that case, we would continue to get good
handheld results right down to the 1/60 sec, with the lens zoomed
out to 200mm.

Click to expand...

If you repeat your test with AS off you will see that as you get to
shutter speeds slower than 1/200 the AS warning sign turns on. As
others have posted if you still insist on 1/200 you can use
exposure lock or Ps shutter.
Minolta has more faith in AS than some of the complainers.

lhomer said:

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fotog said:

I was playing around with my A2 this afternoon, watching the camera
keep the aperture stuck on 7.1, and then something occured to me.

I have the lens wrung out to 200mm. First, as I swing the camera
towards brighter light, the aperture stays at 7.1 while the shutter
speed continues to shorten. All well and good, the idea is for the
camera to keep the lens in the sweet spot at 7.1.

Then I swing the camera towards darker areas, and again, with the
aperture staying at 7.1, longer and longer shutter speeds are being
selected. The speed gets to 1/200, but it doesn't stop there. And,
of course, that appears to be the problem, me thinks that maybe it
should allow the aperture to change now, and allow the shutter
speed to stay at 1/200 sec, in order to stop handheld blur. But
sadly no, the aperture stays locked 7.1, and the shutter gets
longer and longer, until... hey, at 1/60 second, the camera snaps
out of it and finally adjusts the aperture.

It occurs to me that the bug might be that the camera expects the
AS to be on. And in that case, we would continue to get good
handheld results right down to the 1/60 sec, with the lens zoomed
out to 200mm.

--

Click to expand...

tom said:

Tom

fotog said:

I was playing around with my A2 this afternoon, watching the camera
keep the aperture stuck on 7.1, and then something occured to me.

I have the lens wrung out to 200mm. First, as I swing the camera
towards brighter light, the aperture stays at 7.1 while the shutter
speed continues to shorten. All well and good, the idea is for the
camera to keep the lens in the sweet spot at 7.1.

Then I swing the camera towards darker areas, and again, with the
aperture staying at 7.1, longer and longer shutter speeds are being
selected. The speed gets to 1/200, but it doesn't stop there. And,
of course, that appears to be the problem, me thinks that maybe it
should allow the aperture to change now, and allow the shutter
speed to stay at 1/200 sec, in order to stop handheld blur. But
sadly no, the aperture stays locked 7.1, and the shutter gets
longer and longer, until... hey, at 1/60 second, the camera snaps
out of it and finally adjusts the aperture.

It occurs to me that the bug might be that the camera expects the
AS to be on. And in that case, we would continue to get good
handheld results right down to the 1/60 sec, with the lens zoomed
out to 200mm.

--

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Click to expand...

fotog said:

tom said:

Tom

fotog said:

I was playing around with my A2 this afternoon, watching the camera
keep the aperture stuck on 7.1, and then something occured to me.

I have the lens wrung out to 200mm. First, as I swing the camera
towards brighter light, the aperture stays at 7.1 while the shutter
speed continues to shorten. All well and good, the idea is for the
camera to keep the lens in the sweet spot at 7.1.

Then I swing the camera towards darker areas, and again, with the
aperture staying at 7.1, longer and longer shutter speeds are being
selected. The speed gets to 1/200, but it doesn't stop there. And,
of course, that appears to be the problem, me thinks that maybe it
should allow the aperture to change now, and allow the shutter
speed to stay at 1/200 sec, in order to stop handheld blur. But
sadly no, the aperture stays locked 7.1, and the shutter gets
longer and longer, until... hey, at 1/60 second, the camera snaps
out of it and finally adjusts the aperture.

It occurs to me that the bug might be that the camera expects the
AS to be on. And in that case, we would continue to get good
handheld results right down to the 1/60 sec, with the lens zoomed
out to 200mm.

--

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PDM said:

All would be fine as long as the camera firmware would look at the
status of the AS. You would think the camera would look at the
status of the AS, then decide. The status is available, as it is
recorded in the EXIF info. Minolta needs to fix some major issues
in the firmware. OOF, exposure, and P mode issues would be a good
start.

Paul

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t. said:

Perhaps someone could enlighten me - why would one turn off AS for
handheld shooting anyway? If you set it active for exposure only
then surely battery drain is minimal.

Personally I think the only reason Minolta allow it to be turned
on/off is so they can legitimately put a great big green LED on the
back to highlight the feature.

(Maybe I'm a moron novice or just have an unusually steady hand,
but I don't think twice about shooting at 1/60 at full tele for
static subjects - and I haven't had problems with motion blur.
Then again, I don't think I've ever used "P" or "Auto", and the
program settings got switched to memory recalls as soon as I
figured out how. )

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Ingo R said:

According to the manual, Anti-Shake is only enabled "when the
shutter speed falls below a certain limit depending on the focal
length in use."

So unless you're shooting a lot of low shutter speed shots, it
won't come into play enough to overheat IMO. The manual also says
to turn it off for tripod-mounted shots (as it's not needed).

The only heat issue that I've encountered so far has been when
shooting many pics in rapid succession, especially raw, where the
CF card gets mighty warm/hot with write operations. I have removed
the battery on such occasions and found it no be hardly even warm.

I have not been shooting in particularly hot weather yet, though.

--
Ingo

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