my fresnel appears to be quite wonky! I think it is the cause of some of my brightness consistancy issues..
Does anyone have any tricks to flatten them out again?
Does anyone have any tricks to flatten them out again?
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
If you are pressing on the flat side it can be fixed. Dont press on the rings!
Important: Solve the heat issue that caused it before you put it back. Sounds like you need heat glass.
Important: Solve the heat issue that caused it before you put it back. Sounds like you need heat glass.
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. 😀
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.
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.
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