Asahi Takumar 1:2.5/135 Dissasembly

Justin9999 · 01-24-2019, 08:32 PM

I found this Lens Dissasembly Database, but the 135mm f/2.5 lens doesn’t have anything.
Pentax Lens Disassembly Database - PentaxForums.com

Does anyone know how to disassemble this lens?

I am in the process, but this is my first lens tear down and I’m running the risk of learning something unexpectedly.

If no one knows of a tear down guide, then maybe this thread will become such as I share what I’ve done and others answer my questions when I’m stuck.

Thank you in advance!

**Just1MoreDave** · 01-24-2019, 08:57 PM

The barrel in front of the focus grip unscrews on all of the models - Super-Tak, S-M-C Tak or Takumar Bayonet. That splits the lens just in front of the aperture blades, so it is easy to access the front side of the blades. The Bayonet version has a couple of elements in front. A thin ring with spanner slots holds in the front element and you can unscrew this ring via the filter threads. That should allow you access to all the front stuff. The rear has a tube with the other two elements, also with spanner slots. Look into using something that dissolves threadlocker, often found on these lenses. I've never taken apart any of the other models, just checked to see if the barrel unscrews.

**niceshot** · 01-30-2019, 05:22 PM

what exactly is the reason why?

01-24-2019, 08:32 PM	#1
Justin9999 New Member Join Date: Jan 2019 Posts: 1	Asahi Takumar 1:2.5/135 Dissasembly I found this Lens Dissasembly Database, but the 135mm f/2.5 lens doesn’t have anything. Pentax Lens Disassembly Database - PentaxForums.com Does anyone know how to disassemble this lens? I am in the process, but this is my first lens tear down and I’m running the risk of learning something unexpectedly. If no one knows of a tear down guide, then maybe this thread will become such as I share what I’ve done and others answer my questions when I’m stuck. Thank you in advance!

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01-24-2019, 08:57 PM	#2
Just1MoreDave Site Supporter Join Date: Feb 2007 Location: Aurora, CO Photos: Gallery \| Albums Posts: 6,340	The barrel in front of the focus grip unscrews on all of the models - Super-Tak, S-M-C Tak or Takumar Bayonet. That splits the lens just in front of the aperture blades, so it is easy to access the front side of the blades. The Bayonet version has a couple of elements in front. A thin ring with spanner slots holds in the front element and you can unscrew this ring via the filter threads. That should allow you access to all the front stuff. The rear has a tube with the other two elements, also with spanner slots. Look into using something that dissolves threadlocker, often found on these lenses. I've never taken apart any of the other models, just checked to see if the barrel unscrews.

01-30-2019, 05:22 PM	#3
niceshot Site Supporter Join Date: Mar 2014 Location: NY Photos: Gallery Posts: 1,564	what exactly is the reason why?