bah. Any tips to flatten a fresnel?

Status
Not open for further replies.
take 2 piece of thick card board like the one your t.v comes in. put your fresnel in the middle. put on a flat table. use iron heat gently for a couple of seconds place large flat object on top and apply pressure while fresnel still warm. good luck
 
Mine came slightly warped so I clamped a wooden frame around all 4 edges, very simple to do, get some thin timber, nuts and bolts and your laughing 🙂 The frame makes it handy to attach to threaded rod or whatever else you want to use to move the lens back/forth.

Alternative is to stick it to some glass. 😀
 
Don’t laugh, same idea crossed my mind too, when I thought at “duplex” glass.
The process is simple: tow sheets of glass are bond together with some sort of liquid that solidifies when is UV exposed. So why not glue the smooth side of a fresnel to a sheet of glass? And speaking of UV, why not use a UV reflective glass? (well, it will be exposed from the fresnel side 🙂 ). You will have a perfect flat fresnel and an UV filter as a bonus.
 
Status
Not open for further replies.