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0.5" is one stop less than 1" (half the initial exposure time), and 2" is one stop more than 1" (twice the initial exposure time). So where is the problem?
Posted 34 months ago.
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I think the problem is that, even though the camera (and dtmateojr), knows what the exposures should be, "the G10 won't make the EV+1 exposure" (the two seconds).
I know mine works for shorter exposures but I haven't tried it with anything long, like the example. I must give it a test.
Originally posted 34 months ago.
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Geoff in Kingston edited this topic 34 months ago.
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Well, as far as I can see, if you're on Aperture Priority (Av) with AEB you just don't get the expected readings at all. I can't get an exposure of more than 1 second either. Shutter Priority (Tv) seems to alter the aperture in the expected manner, but not Av for longer exposures..... although I got some very strange exif information in many tests.
Anybody care to give this a longer or more scientific test?
Posted 34 months ago.
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I made a few tests. No problem with AEB in Tv mode at any shutter speed. No problem either with AEB in Av mode at 1/100" for example. However, even when not using AEB, it seems impossible to use the Av mode when an exposure time of more than 1" would be necessary. That has most likely something to do with the fact that “this camera, however, applies special processing to images shot at shutter speeds slower than 1.3 seconds to eliminate noise, thereby producing high-quality images” (p. 97 of the User Guide).
Originally posted 34 months ago.
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P. L. edited this topic 34 months ago.
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Good point, P.L., but I'd have thought that the exif information on the exposure would show the actual exposure details (shutter speed) properly.
I must say my tests were not very methodical - I'll just have to try it a lot more. I'm not even sure about what I discovered.... does the camera make its three exposures with only one press of the shutter button? That's what appeared to be happening.
I suppose it's only going to be relevant with HDR - I can't imagine going for a single, long (like a minute), exposure with the G10 - far too noisy. And, as you say, it appears to be fine with shorter exposures.
Posted 34 months ago.
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Anyway the minimum shutter speed with the G10 is 15 sec. Did you ever test such a long exposure? I didn't yet, but I wouldn't be surprised if the noise was less of a problem with long exposure times than with high ISO. Why? See for example this Web page for an explanation: albertdebruijn.com/home/archives/59?content.6.
Posted 34 months ago.
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That information in the User Guide, about "special processing on slow shutter speeds", is interesting..... maybe it changes ISO to prevent the shutter speed rising over 1.3 seconds.
Either way, it results in an image that looks just like the ones at 1 sec or faster, so it's not really going to work with HDR - or for any image where you need a long exposure to get image blur (moving water, for example).
I'll keep experimenting.
Posted 34 months ago.
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Just as an afterthought, I wondered if the 'normal' slow AEB of 1/2 sec, 1 sec and 2 secs might work in Raw, rather than Jpeg...... it didn't.
Posted 34 months ago.
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I noticed this Av limitation when I was taking shots at dusk. I had to use manual exposure to take 6 shots of the same scene.
I use Av mode most of the time. Should we contact Canon about this?
Re noise during long exposures: When taking night shots I use full manual mode. Even 15 secs at ISO 100 look acceptable in terms of noise. And when I do take really long exposures I don't even bother post processing my photos. They look nice as they are. Here's a sample of a 10 sec f5.6 ISO 100 shot:
Originally posted 34 months ago.
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dtmateojr edited this topic 34 months ago.
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Well that image doesn't look over-noisy to me, or at least no more than you'd expect with a night shot. Canon have got this "special processing to images shot at slower than 1.3 seconds" thing wrong, I believe..... the camera does Raw, so it's marketed towards the more knowledgeable amateur, isn't it? So why interfere with normal camera operations? Not that Canon are going to change anything on the G10.
Posted 34 months ago.
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The same thing happened to me, so manual bracketing for night shots which is a bit of a pain.
Posted 34 months ago.
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