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11-10-2012, 10:59 AM   #1
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Green button and Takumars

Hello, I hope someone can tell me what I am doing wrong, or it is just the way it is on the K-30. I have a few M lenses and several Takumars. In Manual mode, I've got the green button set to do Tv shift, so when I set the aperture, press the green button, it will select a shutter speed. It works great on my M lenses, but it will not work on my takumars (the one I am working with is a SMC Tak, 28mm f3.5). I press the green button and it will set it to 1/2000, regardless of where I am pointing the camera. Out a bright window, 1/2000, inside a dark room, 1/2000. I change the ISO and it will change the shutter speed a bit, but will not vary the selection when pointing at different light sources. I do the same thing on my K-x with the same settings and lenses, and it works fine. I used to use the green button on my K200D and K100D (before it was a dedicated button) in the same way, and they all worked the same as the K-x.

Does anyone have a K-30 and screw-mount lenses that have used the green button with Tv shift? How does it work for you?

Thanks in advance for any insight you can give me with this.


11-10-2012, 11:15 AM   #2
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Reset your green button mapping and everything should work!

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11-10-2012, 05:00 PM   #3
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Hi Adam,

Thanks for your help with this. I did some testing and found:
-- Manual green button works for M: lenses.
-- It doesn't for screw-mounts. If you have auto-ISO on, the camera goes into Av mode (the mode is displayed on the top-left of the LCD). If not, the green button doesn't work.
-- But, the one really cool thing I found is, in Av mode (selected on top dial to Av), the camera meters screw-mount lenses fully, without having to use the green button to meter. The exposure changes as you change the aperture and light intensity, just like normal aperture-priority cameras. The only difference is with a screw-mount is, of course, you don't have open-aperture metering - you have the lens aperture set to manual.

This is great! It is so much more convenient to have full metering without having to use the green-button.


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