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Mark Techer wrote:
 The term cylindrical actually refers to the shape of the lens in plan. From the front, the lens may be a square, rectangle or round, but when viewed from the top, the lens appears to have had a cylinder cut out from it (concave lenses) or resemble a part of a cylinder (convex lenses)... |
Aah!..Now I'm with you..It's either a Plano-Convex or Plano-Concave lens..
I have a Fresnel lens, which is 10" x 12", and as you may know, it's a flattened version of a Plano-Convex lens..
I was going to place it against the back prism, just to see what it did, but I don't have a decent enough saw to cut it to size, without damaging the rings, so I never tried it..
I don't think the quality of those lenses would be very good either...
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Yes, the more light control the better. I have also tried something new. Rather than block the ends of the prisms with flocking, I am just absorbing the light from the ends inside the case. And it seems to be working a treat too...
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That sounds like a very good idea..
As you may recall, I had the problem of light reflection from the adhesive of flock material, which was producing the side wall reflection..
I might try that with my lens..What's the best method for removing the flock?