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.
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.
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
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