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11-22-2012, 09:28 PM   #1
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No manual control for M lenses

It's not possible to set the shutter speed when using an M lens. Every position on the mode dial shows "Av" on the screen. This makes my M lenses rather useless. That's the biggest shortcoming I've found. I tried to use my mirror lens to shoot the moon today, and I couldn't manually set the exposure. I had to dial in exposure compensation instead, and it was a big hassle. Is there a way around this, or is it just not something that can be fixed?

Charles.

11-22-2012, 09:35 PM   #2
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You've got to select M mode- have you tried that?

Here are the full instructions:
https://www.pentaxforums.com/forums/pentax-lens-articles/110657-how-use-meter...k-x-k-7-a.html

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11-22-2012, 09:47 PM   #3
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Also, when you are in M mode, you will have to turn off Auto-ISO (that is, select a fixed ISO) for full manual control, because M+AutoISO = TAv mode.
11-22-2012, 09:48 PM   #4
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Hrm. Well, it's not intuitive. Problem was ISO was set to auto, which then did not allow me to set the shutter speed. The camera acted as if it was in Av mode -- and indeed, whenever I rotated the dial it indicated Av mode on the screen, no matter what it was set to. I set the ISO at 400 and suddenly I could change the shutter speed again.

Charles.

11-22-2012, 09:57 PM   #5
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Yeah, it can be a pain when you want total control, but it also can be really handy. On M42 lenses, TAv becomes "point and shoot" mode - it's always metering and selecting a useable ISO and shutter speed, so you don't even have to use the Green Button. You can use EV compensation to tweak shutter speed if necessary.
11-25-2012, 11:51 AM   #6
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The green button can be used (when the version 1.01 of the firmware is installed)
11-25-2012, 01:14 PM   #7
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QuoteOriginally posted by enzo Quote
The green button can be used (when the version 1.01 of the firmware is installed)
The green button can be used with any firmware with M lenses...
11-25-2012, 05:40 PM   #8
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Unless ISO is set to Auto, you mean. Then the green button doesn't do squat.

Also, do note that even with firmware 1.01, "TAv" never appears on the screen. "Av" shows up for all positions on the dial.

Charles.

11-27-2012, 04:31 PM   #9
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Green button works nice, but I wish that the rear LCD had a meter though OR the histogram would shift with changing shutter speeds/apertures. That would make the K-01 the king of MF K-mount.
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