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12-11-2009, 01:55 PM   #16
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Ok I did the ruler test.
In M mode I see a huge difference in DOF between the two aperture values. (This time I set the ISO at 1600 in order to have a correct exposure even a f/22)
In Av mode there is no difference in DOF between the two aperture values.

12-11-2009, 01:57 PM   #17
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QuoteOriginally posted by miss_alexx Quote
Ok I did the ruler test.
In M mode I see a huge difference in DOF between the two aperture values. (This time I set the ISO at 1600 in order to have a correct exposure even a f/22)
In Av mode there is no difference in DOF between the two aperture values.
This is to be expected. In Av-mode only the biggest aperture can be used (in this case f1.7). So when you want to use any other aperture you need to set your camera to the M-mode.
12-11-2009, 02:00 PM   #18
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QuoteOriginally posted by matiki Quote
How is that?
For starters, shutter speed priority (Tv) mode isn't even available for m-series lenses. Second, she said she set the aperture to f22 and then pushed the green button, giving her a shutter speed of 0.4". If indeed she had exceeded the ISO-limit, the shutter speed should be at it's minimum, namely 30".

What she encountered was simply faulty metering.
12-11-2009, 02:02 PM   #19
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I understand now. Thank you to all who helped me!
I've been using a 50mm f/2 in Av mode for at least one month... I did not notice that the Av mode was not really working...

12-11-2009, 02:02 PM   #20
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QuoteOriginally posted by kevinschoenmakers Quote
For starters, shutter speed priority (Tv) mode isn't even available for m-series lenses. Second, she said she set the aperture to f22 and then pushed the green button, giving her a shutter speed of 0.4". If indeed she had exceeded the ISO-limit, the shutter speed should be at it's minimum, namely 30".

What she encountered was simply faulty metering.
A mistype. Sorry. Aperture priority.

Last edited by matiki; 12-11-2009 at 02:14 PM. Reason: self remedying some rudeness
12-11-2009, 10:56 PM   #21
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QuoteOriginally posted by miss_alexx Quote
I understand now. Thank you to all who helped me!
I've been using a 50mm f/2 in Av mode for at least one month... I did not notice that the Av mode was not really working...
You aren't the first to make that mistake, and won't be the last.
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