Mona the homemade meniscus lens

I took the front element of a broken japanese 50mm standard slr lens and mounted it on a M42 thread with tubes from cardboard. The tubes can be telesoped to focus. Now it's a single element f/4 70 mm lens, an extra aperture of f/6.3 can be attached reducing the aberrations.

I took the front element of a broken japanese 50mm standard slr lens and mounted it on a M42 thread with tubes from cardboard. The tubes can be telesoped to focus. Now it's a single element f/4 70 mm lens, an extra aperture of f/6.3 can be attached reducing the aberrations.

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