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Endless choices IMHO.
Many years ago I converted two telephoto lenses to finder duty - the first was a Takumar 135mm, with a 20mm kellner behind that. Later I used a 500mm f/8 mirror lens - very stubby thing, 60mm aperture, worked beautifully for many years.
Now I'm using a 70mm APO as a finder which I feel is ideal.
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