Is this lens shot?

Discussion in 'Canon FD' started by scottsapp, Feb 28, 2019.

  1. C8EFC073-9703-4493-AC7B-29713F8883B0.jpeg BF21C70B-A672-4EF5-8C06-397A09E50DBA.jpeg Or is this operator error? Canon EF and 28mm 2.8.
  2. Not operator error. Perhaps the lens has been reassembled incorrectly, for example, with an element reversed. Does it show signs of having been opened up, burr marks etc?
  3. What lens? Agree with the above comment. Looks like the lens was taken apart and reassembled wrong.
  4. Even if it is toast, you might want to hang on to it as a soft-focus lens. I "made" a soft focus lens from a magnifying glass, a T-mount, and a toilet paper tube that gives similar results.
  5. As stated, this looks like one (or more) of the elements is in backwards. I learned years ago to mark the outside surface with a Sharpie. Once, someone sent me a 50/2 Summicron with three groups inserted backwards. That took a lot of trial and error to correct.

    Which lens is this? Perhaps looking at the optical formula will help determine which element is reversed. The Canon 100/3.5, 135/3.5, some others- the rear element is easy to put in the wrong way.
  6. thanks for the replies. the lens is a Canon FD 28mm 2.8. I'll have a look tonight to see if it looks like it was opened up. I'd like to see if i can put it back together properly if it can be saved.
  7. I cannot find the optical formula for that lens- not given by the Canon Museum. The rear element would be my first suspect.

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