Adaptall-2 19AH Iris Issues

**jawats** · 05-03-2019, 03:53 PM

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?

**luftfluss** · 05-03-2019, 05:22 PM

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

**jawats** · 05-04-2019, 12:58 PM

Originally posted by luftfluss

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!

**marcusBMG** · 05-04-2019, 02:08 PM - **1 Like**

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.

**jawats** · 05-08-2019, 03:00 PM

Originally posted by marcusBMG

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.

stevebrot · 05-13-2019, 11:29 PM - **1 Like**

Originally posted by marcusBMG

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

05-03-2019, 03:53 PM	#1
jawats Site Supporter Join Date: Nov 2017 Photos: Gallery \| Albums Posts: 756	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?

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05-03-2019, 05:22 PM	#2
luftfluss Site Supporter Join Date: Jun 2011 Location: NJ Photos: Gallery \| Albums Posts: 11,619	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
jawats Site Supporter Join Date: Nov 2017 Photos: Gallery \| Albums Posts: 756 Original Poster	Originally posted by luftfluss 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
marcusBMG Site Supporter Join Date: Nov 2012 Location: North Wales Photos: Gallery \| Albums Posts: 2,868	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
jawats Site Supporter Join Date: Nov 2017 Photos: Gallery \| Albums Posts: 756 Original Poster	Originally posted by marcusBMG 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
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by marcusBMG 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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