In reply to Michael Foster's message of Sat, 17 Sep 2005 19:03:06 -0400 (EDT): Hi Michael, [snip] >resistant, but kind of saggy. Therefore, I would guess >the cost would go up about 20 times the price of my >super cheap fresnel lens film. I used to buy quite a >bit of polycarbonate, but haven't priced it lately, so >it's just an estimate.
Thanks, that's all I wanted. [snip] >Conversely, imagine this cheap stuff stapled to a cheap >wooden or maybe tubular plastic frame. You blast it with >a heat gun or perhaps even hold it over an open fire >and the film shrinks tight as a drum, giving you a flat >lens probably more rigid than if you sandwiched it between >thicker materials. Cheap, cheap, cheap. Did I mention cheap? Ok, but doesn't stretching it play havoc with the focal point? Regards, Robin van Spaandonk In a town full of candlestick makers, everyone lives in the light, In a town full of thieves, there is only one candle, and everyone lives in the night.
