Manual Mode issue on K-30

fgpinarli · 11-30-2014, 04:21 PM

Manual mode metering of the green button doesn't work (all settings right) in my K30 +genuine pentax m42 adaptor+ SMC Tak 85mm 1.8. However, when I use a third party m42-PK adapter (no infinity focus, silver metal, not black) instead of genuine Pentax adapter, green button meters correctly. Does it mean that the cheap adapter has a better conductivity than the Pentax one?

Not a Number · 11-30-2014, 06:20 PM

Originally posted by fgpinarli

Does it mean that the cheap adapter has a better conductivity than the Pentax one?

The genuine Pentax adapter has no flange on it and does not touch the contacts at all. Takumar lenses usually have non-conductive mounts on them and are typically a smaller diameter that does not touch the contacts either. What some people do is after mounting the lens they stuff some metal foil between the lens and the contacts. You could try making a collar of sorts from an aluminum beverage can. Just be sure to sand off any paint or coatings on the area that will touch the contacts. The insides of the cans have a clear coating on them. The can material may be thick enough to throw off infinity focus though.

fgpinarli · 12-01-2014, 12:35 PM

Thank you for the explanation. However, I guess I won't try this, I'll rather prefer to use third party adapter for portraits and manual metering when I need to focus to infinity.

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11-30-2014, 04:21 PM	#16
fgpinarli Senior Member Join Date: Jan 2008 Location: Ankara, Turkey Photos: Gallery \| Albums Posts: 142	Manual mode metering of the green button doesn't work (all settings right) in my K30 +genuine pentax m42 adaptor+ SMC Tak 85mm 1.8. However, when I use a third party m42-PK adapter (no infinity focus, silver metal, not black) instead of genuine Pentax adapter, green button meters correctly. Does it mean that the cheap adapter has a better conductivity than the Pentax one?

11-30-2014, 06:20 PM	#17
Not a Number Moderator Join Date: Mar 2012 Location: Venice, CA Posts: 10,526	Originally posted by fgpinarli Does it mean that the cheap adapter has a better conductivity than the Pentax one? The genuine Pentax adapter has no flange on it and does not touch the contacts at all. Takumar lenses usually have non-conductive mounts on them and are typically a smaller diameter that does not touch the contacts either. What some people do is after mounting the lens they stuff some metal foil between the lens and the contacts. You could try making a collar of sorts from an aluminum beverage can. Just be sure to sand off any paint or coatings on the area that will touch the contacts. The insides of the cans have a clear coating on them. The can material may be thick enough to throw off infinity focus though.

12-01-2014, 12:35 PM	#18
fgpinarli Senior Member Join Date: Jan 2008 Location: Ankara, Turkey Photos: Gallery \| Albums Posts: 142	Thank you for the explanation. However, I guess I won't try this, I'll rather prefer to use third party adapter for portraits and manual metering when I need to focus to infinity.