Carl Zeiss 50mm F2 T* ZM Planar – lens disassembly

Most of Zeiss ZM lens are quite compact and solidly built and work flawlesly for long period of time. The 50mm F2 Planar may only need disassembly for cleaning dust or relubrication. However sometimes you may also want to calibrate the infinity focus point on Leica M body.

Fortunately disassembling ZM 50mm F2 Planar is quite simple process, though it requires precision and some precaution steps.


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7artisans 35mm F1.2 – shifting 6th element

After reading great review of 7artisans 35mm F1.2 on 35MMC I explored more details about Sonnar design C Sonnar T* optical formula. I was wondering what happens to the picture if the 6th lens element is placed in same group with 4th and 5th, like it’s done in Zeiss Sonnar C 50mm F1.5 ZM T*.

It’s quite easy to try, because 7artians engineers made the rear lens block very easy to disassemble without using any tools. Regular rubber glove provides firm grip and enough torque to unscrew the metal ring around the 6th element. Then it’s easy to pull out the 6th glass, remove the metal shim under it and place it back, and screw the metal ring to it’s place.

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Voigtlander 40mm F1.4 – disassembly


The Voigtlander 40mm F1.4 is one of my favorite CV lens. It renders great on Leica M, and also adapted on Fujinon cameras producing pleasant classic looking images without extra modern sharpness. I had few samples in the past required cleaning of the glass surface in the aperture chamber, and typically disassembled the rear area. In this post I’ll also show how to run disassembly from the front which looks easier.

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Comparison – Mitakon 35mm F0.95 MK-II vs 7artisans 35mm F1.2 vs Voigtlander 40mm F1.4 S.C


Today I’ve put Fujinon X-E2s camera on a tripod, set ISO200 and made sequence of shots at different apertures up to F4 with following 3 lens:

  • Mitakon Zhongyi 35mm F0.95 MK-II
  • 7artisans 35mm F1.2
  • Voigtlander 40mm F1.4 S.C

Shots with Voigtlander are made from longer distance to catch same frame area. Then I’ve cut 3264×3264 from each shot (original frame is 4896×3264) to compare square area between each lens.

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7artisans 35mm F1.2 lens – partial disassembly

Today my goal was to fix small problem with unmounting 7artisans 35mm F1.2 lens from the Fujifilm camera. During recent 7artisans 35mm F1.2 lens review I’ve realized that this lens can stuck when the lens lock pin of the camera catches one of lens mount bolt location. So I’ve disassembled the rear area to see what can be done.


You will need T6 Torx screwdriver to start the disassembly.

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7artisans 35mm F1.2 – calibrating infinity

Number of 7artisans 35mm F1.2 owners reported that infinity focus at F1.2 is not correct. During my recent review I’ve assumed that three tiny Allen (or Torx) bolts on the focus ring may serve to calibrate the infinity point.

Today I decided to check that. I’ve also realized that my sample can’t perfectly focus at infinity on the very far distance (more than 200ft). And the good news is that it can be relatively easily calibrated without disassembly or sending the lens back to the factory : )


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eXperiment – embedding lens filter

Front lens caps are nicely protecting your lens… until you accidentally scratch the front glass element by misplaced cap border in the photo bag. I also don’t like front caps for the extra time required to take them off.

Protective filters solves that concerns. However I often don’t like how the lens look with filter, and that it becomes slightly longer.

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7artisans 35mm F1.2 lens review

Once the 7artisans 35mm F1.2 got announced on Fujirumors I started watching their lens and exploring more details online waiting for release.

The sales started on December 28 2017, but I didn’t find any good review of this lens, so decided to purchase and try it myself.

This noon I’ve received free sample directly from 7artisans factory which they generously gifted as a result of our recent cooperation ( thank you 7artisans Team! )

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