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Many users have a defective focussing unit, should be no problem as long one use a bajonett mount hood all the time.
Some have damaged the focussing unit when they transport the lens with extended tube (not infinity focus). Use of filters could probably damage the AF too.
Since I have cnverted a Minolta Rokkor my copy of the EF 50/1.4 is only a backup, or is few cases I nees AF.
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