Tristan Pemberton

I've found it's much more economical (time & money) to use 3D printer supplier. That way you have someone experienced who can check the designs for errors before you even start printing prototypes. Depending on the size of the part/object, it's not that expensive to have it printed in most plastics on offer. Also 3D printers designed for "professional" accuracy are very expensive, and probably give you much better quality prints than the entry level models. I have experience using 3D/CAD, so creating the designs isn't too difficult for me. For someone starting out, that can be a huge disincentive, especially with the steep learning curve required to use most 3D/CAD software.

Very interesting stuff. Definitely something I'd want to attempt myself - certainly not with a lens that matters.

Hey Roger, I'm interested in the Zeiss 12-120mm. Send you a private message.

What is the condition of the optics?

What is the front diameter of this lens? What is the weight? I've heard the lens telescopes when focused, is that true? What sort of price are you hoping to get? Thanks.