I found this design and it fitted my need perfectly. It is a mount for a very popular camera lens used in astrophotography. It not only functions as a weight relief for the camera but also allows to rotate the field of view. Moreover it is possible to focus the lens with the installation of a stepper motor, which will be the next step.
The single parts are screwed together with the help of threaded heat inserts. Just to make sure they are also glued together with epoxy, as the mount really needs to hold up. The screws are locked with Loctite.
Edit: Link to the mount (not my design): https://www.thingiverse.com/thing:6099113
This is weird - I've never seen my Canon 70-200 2.8 as an astrophotography lens. I usually opt for my wide angle, fisheye, or telescope attachment.
What is it about this lens that you enjoy for astrophography specifically?
Edit: love the stepper motor addition! Very cool.
Edit: Oh! I misread. This is based on that lens! Interesting. Weird that a 135mm would be used for this!
This lens is incredibly sharp and produces nearly no coma. Also the image is super flat and the lens also works for full frame cameras. For its high image quality it‘s also used by some more advanced astrophotographers.
As I bought it new for 400€ this was a no brainer because we can also use it for 'normal' photography.
I‘m sure your lens works well for many nebulae!