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3D CAD drawing:
Bracket for Pentax 645 300mm ED f/4 lens


Contents:

  1. Draw a bracket for the back end of lens
  2. Draw a bracket for the front end of lens
  3. Draw a 180 teeth pulley for motor focus of the lens
  4. To be continued

Note:
I take no responsibility or liability for what are written here, you use the information at your own risk!


1, CAD draw a bracket for back end of lens:

Introduction:

I have already made a pair of tube ring holders for my guiding system. This time I make a drawing of two tube ring holders to my Pentax 645 medium format lens, the 300 mm ED f 1/4.


Pentax 645 300 mm bracket at back end:

3D CAD: Pentax 645 300 mm f 1/4 ED lens tube ring

I have started with the tube ring that is towards the camera, the back end. I choose a similar design as I had for the Tokina lens. But this lens is much heavier and I increased the dimension of it. I have the same height as I had to the Canon 300 mm lens, I want the pulley sit at the same place so I can reuse the focus motor bracket and simple just switch between the lenses. The top end I also made more compact.


3D CAD: Pentax 645 300 mm f 1/4 ED lens tube ring

The nuts is placed into pockets to not have to thread them later.

When I 3D-print it later I have tweaked the 3D-printer with spring loaded rods. You can see the details here: 3d-printer setup. Earlier I adjusted the frame of the 3D-printer.


3D CAD: Pentax 645 300 mm f 1/4 ED lens tube ring

The depth of it is 20 mm and the thickness of the ring is 7 mm, is it strong enough to hold this heavy lens ? I will know after some cold nights if it's enough.


3D CAD: Pentax 645 300 mm f 1/4 ED lens tube ring

The screw can not be too long, if, they will hit the lens body and destroy it.


3D CAD: Pentax 645 300 mm f 1/4 ED lens tube ring

The size of this screw is M6. Now I have to make another drawing to the front tube ring. The diameter of the barrel at the front is of a bigger diameter.

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