Most of the box cameras that use a singlet used a meniscus lens rather than
a plano-convex or double convex lens. Best results come from using a stop
between the subject and lens and concave side toward subject.
Last time I checked, there were a couple of meniscus lenses in one of the
Edmunds catalogs in the educational section. There are also some listed on
the surplus shed site someone else posted.
I have no idea how much of an improvement this is over a plano-convex lens.
John Sparks
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