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ISCO Westron 35/2.8 Disassembly
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PostPosted: Fri Sep 19, 2014 9:20 am    Post subject: ISCO Westron 35/2.8 Disassembly Reply with quote
HI

This version of the ISCO Westron 35/2.8 suffers from a very tight aperture ring. It's made of plastic. Anyone knwos how to remove it?

Here is a pic of the lens with the aperture ring marked with the green arrow

https://www.flickr.com/photos/40638730@N04/15099397647/


I've managed to remove the name plate easily by using a rubber stopper
https://www.flickr.com/photos/40638730@N04/15099189179/in/photostream/

Inside are 4 screws that hold the focusing ring to the focusing helicoid. I removed two and slided the focus ring out
https://www.flickr.com/photos/40638730@N04/15099191059/in/photostream/

I can see a retaining ring, marked with the red arrows. I tried to turn it with a lens spanner, it turns 1 CM and is then stuck. I've tried to turn it with a lot of strength but it won't turn anymore. Should I use brute force?

This is where I got stuck. How do I get to the aperture ring?


There is nothing at the back of the lens to unscrew
https://www.flickr.com/photos/40638730@N04/15286011335/
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