BMPCC6k lens flange protrusion mod

Blackmagic Pocket Cinema Camera 6k internal mod

This is a piece to replace the original flange thing on the first-gen BMPCC 6k.

Problem:

The original piece is too thick and interferes with some lenses that have a large rear protrusion.

I recently bought a Blazar Remus 33mm T1.8 cine lens, which has a very long protruding rear element, and it physically cannot mount unless almost all the shims are used. However, that way, the lens isn't able to focus to infinity since the flange distance is too long.

Unfortunately, this piece is necessary on the camera since the IR cut filter is only held on with friction from a rubber O-ring, so with enough vibrations, it might come out if the part is just removed to solve the issue.

I took a bunch of measurements and recreated this piece in Blender, but decreased the width of the wall so that the lens is now able to fit just like the original piece.

Note that the cutout for the electrical contacts is rotated slightly from the centre so that Blender doesn't mess up the boolean, and I'm too lazy to work around it. This doesn't affect anything. Also, the 3D printed one doesn't have the same ribs/grooves as the original one. I couldn't be bothered to add them, and so far it hasn't seemed to change the image.

The modded piece now allows for a wider variety of lenses to be used with the camera, and proper focus can be set since the lens can physically sit closer to the sensor.

original piece:

Modded piece:

Assembly

Just unscrew the 3 screws to take out the original piece with a small Phillips head screwdriver, lift the old piece out carefully, and use the same screws to attach the modded piece

Print settings

Print with a very fine layer height for accuracy.

I printed mine in black PLA+, using PETG support interface so that overhanging bits don't sag and make the parts too thick.

- 0.08mm layer height

- 3 walls

- infill doesn't matter, walls are thin

- Esun black PLA+ with bambu HF PETG support interface