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01-09-2014, 06:30 PM   #31
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Location: Puget Sound
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QuoteOriginally posted by grahame Quote
Tak 300/3.5 is a preset lens. There is nothing on the read end controls aperture. The 2nd ring on the front does that. Pushing green button won't do anything to the exposure metering or aperture stop down. Camera meters before you press the shutter button.
Correct, I misspoke! I meant metering with the green button using a M42 lens. Not stopping down as I indicated...sorry. Also, I was using a 200/3.5

01-09-2014, 06:36 PM   #32

Join Date: Oct 2011
Location: Savannah, GA
Posts: 5,002
QuoteOriginally posted by monochrome Quote
This (no Green Button metering in LiveView for Takumar lenses) is a well-documented condition, begining with the K-01. It has to do with the paint on the Takumar lens mount failing to short the contacts on the camera. There are kludge work arounds such as using bits of foil stick to the lens - apparently Pentax is in no hurry to correct this in a FW update.

Bayonet mount lenses do not exhibit this behavior, presumably because the mounts are not painted.
Getting back to the original topic (sort of, since I can only comment on the K-01), just repeating that my K-01 green button sets the shutter speed just fine with m42 lenses (or even no lens at all) in M mode. (ISO must be fixed.)

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