I recently bought a Schneider 180mm Apo-Symmar L (new). After a while I noticed that one of the shutter blades was out of sync with the rest. In other words it appeared slightly more open than the rest. The result is that, when progressively stopped down, the shutter opening looks slightly tear-drop shape.
The lens went back to Schneider and then to Copal. Both said that the shutter was within tolerable limits and would not affect picture quality, e.g., bokeh.
I have no reason to doubt their word but I would like to know if a non-round shutter opening would affect the final photograph in any way.
Many thanks.
Steve
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