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| p.1 #2 · oil on aperture blades of 58 FL 1.2 - can it affect picture quality too? |
"Oil mist" can certainly deposit onto lens surfaces, but should be visible if looking through the lens. A real torture test is to shine a flash light through the lens while looking, this will reveal any deposits on the glass. Beware that all lenses look bad when doing this (all lenses have dust inside them). 1.2 and faster lenses are softer than their 1.4 and 1.8 counterparts and the term "sharp wide open" is among the most overused one in the photo community. In other words; your lens could be fine, you may just not be used to how soft old, fast lenses can be. The FL lenses I've owned (28/3.5 and 55/3.5 macro) had terrible coatings (not damaged, just really poor at handling stray light, resulting in low contrast), which could also affect your perception of sharpness.