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05-03-2019, 03:53 PM   #1
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Adaptall-2 19AH Iris Issues

Note: Not Irish issues.

I was using my 19AH with the PK/A adapter, and as I was attaching it, it jammed and the aperture ring froze. When I looked inside, two of the iris blades appear to have come loose inside. I was considering opening it up and attempting repair. In the condition it's in (good other than the iris blades), I doubt it would be worth trying to sell. Plus, I rather like the lens. Anyone with experience opening this lens?

05-03-2019, 05:22 PM   #2
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Hmm, maybe post over on MFlenses.com. This isn't really a Pentax repair and warranty issue, though. There's an Adaptall thread you can try: Adaptall Mount Club (Tamron). - Page 250 - PentaxForums.com
05-04-2019, 12:58 PM   #3
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QuoteOriginally posted by luftfluss Quote
Hmm, maybe post over on MFlenses.com. This isn't really a Pentax repair and warranty issue, though. There's an Adaptall thread you can try: Adaptall Mount Club (Tamron). - Page 250 - PentaxForums.com
I'll give it a try over there - thank you!
05-04-2019, 02:08 PM - 1 Like   #4
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Not clear to me how that could have happened - the mount has a plate that pushes on a wheel that is on the end of a small lever that connects to the iris actuation. There isn't really anything to catch and break...
Getting at the iris looks like a complete disassembly, it's in the middle of the lens. There is some info here:

Google Translate

However even if you get there you may well find the iris isn't repairable if eg the hinge pins on the iris blades have broken/pulled out.
Bad do.

05-08-2019, 03:00 PM   #5
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QuoteOriginally posted by marcusBMG Quote
Not clear to me how that could have happened - the mount has a plate that pushes on a wheel that is on the end of a small lever that connects to the iris actuation. There isn't really anything to catch and break...
Getting at the iris looks like a complete disassembly, it's in the middle of the lens. There is some info here:

Google Translate

However even if you get there you may well find the iris isn't repairable if eg the hinge pins on the iris blades have broken/pulled out.
Bad do.
Thank you, Marcus, as always. I'll let y'all know how I go on this.
05-13-2019, 11:29 PM - 1 Like   #6
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QuoteOriginally posted by marcusBMG Quote
Not clear to me how that could have happened - the mount has a plate that pushes on a wheel that is on the end of a small lever that connects to the iris actuation. There isn't really anything to catch and break...
I agree, the iris mechanism couples passively to the mount.


Steve
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