One notable excerpt from the article's conclusion is as follows:
"Voigtlander 40mm F2.8 lens is very solidly built and is quite easy to perform CLA. Access to aperture chamber is relatively simple if you have experience using precise spanning wrench. I noticed signs of securing glue on bolts, so unscrewing them require initial high torque to loosen glue first. Due to very compact lens size this Voigtlander 40mm F2.8 Heliar requires higher accuracy of all moves and more patience comparing to working with averagely sized lens."
p.1 #3 · Disassembly - Voigtlander 40mm F2.8 Heliar Vintage Line Leica M
Thanks for good question Fred, yes there is a possibility of such adjustment by adding custom shims between rangefinder couple ring and helicoid cylinder to make it sit higher and shift RF patch toward infinity.
However if correction toward close focus is required it is more challenging. In that case I'd screw out RF couple helicoid cylinder from its thread and re-connect it to next CCW position, so it is sits deeper when rotated CW back to fit same position to connect RF couple ring. After that more thick shims need to be added between RF ring and RF cylinder. This adjustment is not ideal, because it may limit the path of RF ring and may not allow lens to focus closer than 1m.
p.1 #4 · Disassembly - Voigtlander 40mm F2.8 Heliar Vintage Line Leica M
yukosteel wrote:
Thanks for good question Fred, yes there is a possibility of such adjustment by adding custom shims between rangefinder couple ring and helicoid cylinder to make it sit higher and shift RF patch toward infinity.
However if correction toward close focus is required it is more challenging. In that case I'd screw out RF couple helicoid cylinder from its thread and re-connect it to next CCW position, so it is sits deeper when rotated CW back to fit same position to connect RF couple ring. After that more thick shims need to be added between RF ring and RF cylinder. This adjustment is not ideal, because it may limit the path of RF ring and may not allow lens to focus closer than 1m....Show more →
Thank you for sharing this information. In my experience, adjusting for front-focusing tends to be more challenging and, for some reason, is the most common issue.
