Originally Posted by
Jim Graves
On mine, the front spacer ring is the narrower of the two. But, when I switch just the rings, it makes little difference ... the focal length stays the same and I don't get vignetting ... so I don't think that's your issue.
The Radar is a modified Tessar with the rear element being a cemented triplet. The rear element should have the flat side toward the iris and the convex side toward the film. The front element set should be convex on the front and concave on the iris side.
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