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Is this lens shot?


scottsapp

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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.

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