Weird issue w/Ext. tube + M42 lens

Started Apr 20, 2012 | Discussions thread
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Martin Ocando
Martin Ocando MOD Veteran Member • Posts: 4,946
Weird issue w/Ext. tube + M42 lens

If I shoot my G3 using the extension tube and my 55mm Takumar, stopped down to f:11, this is what I get. Look the bright spot in the center of the image:

But if I shoot wide open, the center is not bright, but I don't have enough DOF.

What could be causing this, and how to avoid it.
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Martin Ocando
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