Have just received Alan Greene's book Primitive Photography and would like to have a go at crafting my own portrait lens (a la Blue Peter). Where in the UK and the rest of Europe can I get hold of specific sized/shaped optics that aren't prohibitively expensive. I'm after such things as planar-convex and positive meniscus lenses.
I'll probably ransack an old pair of binoculars in the end, just thought I'd ask here first.
Thanks
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