Adjustable phone holder for afocal projection astrophotography

Notes

update - Redesigned from scratch after a few test prints. The blocks on the edges didn't quite close around my phone with it aligned on the eyepiece. Also, it couldn't handle phones like samsungs where the camera was in the middle. This version should be a bit more useful.

Background

I am designing this for the Edmonton RASC observatory at the Telus World of Science, Edmonton.

They hold public observing when the weather is good, and many people out for a walk in the park stop by. Invariably, someone wants to take a photo with their phone.

Idea

Since we can't predict just what phone exactly will be used, I have taken the design for the holder for the minikossel, and turned it into an astronomy outreach tool.

This thing is intended to be used with an eyepiece in place already - it won't fit directly in the focuser. I have estimated that the 2inch eyepiece we want to use this with has about 2.2inches OD at the spot where the eyecup normally fits on it. A similar guess was made for the 1.25" version. I will refine those once I have actual numbers.