The flash light test...

grain elevator

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Urbantropp said:
Maybe the fact is that you used a low-quality flashlight? Unfortunately, this happens when the manufacturer installs low-quality glass. When dust gets in, it creates a cloudy light effect, the same thing happens with the lens that is in the camera.
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Absolutely - you should only use a genuine Leica flashlight to check Leica lenses!
 

benjiboy

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I confess that in my seventy years of photography, I have never done "the flashlight test".
 

Andrew O'Neill

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I did a flashlight test on my Mamiya Six Folder, to see if the bellows had any pinholes. None that I could see. No light emitting from the lens either. A roll of film run through it, confirmed that all was good.
 
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