Pentacon 100mm infinity / macro hacks

[Pancolart]

Wanted to share two interesting stuff i've learned about Pentacon 2.8/100mm:

1. Removable alu spacer: thick for M42 and thin for EXA (applying EXA spacer on M42 lens will get you closer to the sensor)
2. Two screws that act as macro / infinity focusing limiters. You can see i've removed macro limiter thus lens MFD is enhanced a bit. Aperture still works normally. Infinity limiter now also acts as MFD limiter.

[iangreenhalgh1]

Is this really a sensible idea? Taking a lens apart and modifying it is a lot riskier than using a simple extension tube to get closer focus.

[Pancolart]

Frankly, no. But if you already have it apart due to greasy aperture blades you can consider these hacks. Besides it's not really much apart. Three screws on rear and you're already there. It's also interesting for those that cannot reach infinity due to different reasons. Pentacon 100mm does not allow classic front (focusing ring release) infinity adjusting!

[DR.JUAN]

It's nice fl to work with, and the lens is good enough to use.

Modify a lens, doing a good work, is a pleasure. And for somebody is a satisfaction too.

Thanks for sharing the adventure with that pentacon (meyer) lens.}