qvsm Posted November 20, 2011 Share #1 Â Posted November 20, 2011 Advertisement (gone after registration) I picked up the below 50mm Summilux V2 last week, but didnt notice the marking on the aperture baldes under the shop lighting. Once home and having another look, I seen what you see pictured. Its hard to say whether the marks are wet indicating oil, or dry (possibly again oil) or whether the marks are worn blades. All the marks are uniform across each of the 12 blades. Â Any advice as to what the marks are? Can it be fixed? Â Obviously trying to determine whether to pass the lens back to where it was bought from - or whether to get the shop to CLA it (not on my money!) Â Thanks Link to post Share on other sites More sharing options...
Advertisement Posted November 20, 2011 Posted November 20, 2011 Hi qvsm, Take a look here Worn aperture blades or oil? Or both?. I'm sure you'll find what you were looking for!
pico Posted November 20, 2011 Share #2 Â Posted November 20, 2011 What you see is entirely benign wear. It won't hurt anything. If none of your lenses show the same, then you haven't used them enough. Â Open the lens to widest aperture and shine a light through the backside. See any oil on the glass? No. Good to go. Link to post Share on other sites More sharing options...
qvsm Posted November 20, 2011 Author Share #3 Â Posted November 20, 2011 Thanks pico. Is there an easy way to see oil - and distinguish it from dust particles? Link to post Share on other sites More sharing options...
ho_co Posted November 21, 2011 Share #4 Â Posted November 21, 2011 Oil looks smeary, like a jelled liquid. When you see it, you'll recognize it. Â But my 50/1.4 looks exactly like yours and works fine. It's just normal wear. Link to post Share on other sites More sharing options...
Messsucherkamera Posted November 21, 2011 Share #5  Posted November 21, 2011 What you see is entirely benign wear. It won't hurt anything. If none of your lenses show the same, then you haven't used them enough. Open the lens to widest aperture and shine a light through the backside. See any oil on the glass? No. Good to go.  I'd agree with Pico on this.  If you see a lens that has aperture blades that look oily, that lens has been left in a car in hot weather and has been subjected to overheating. The dry lubricant used in aperture blades changes to a liquid state when subjected to extreme heat.  This can be corrected but requires that the lens be sent to off for a CLA.  Moral of the story: Don't leave your cameras and lenses in a car to bake in hot weather. Link to post Share on other sites More sharing options...
qvsm Posted November 21, 2011 Author Share #6 Â Posted November 21, 2011 Many thanks for the advice. Link to post Share on other sites More sharing options...
brill64 Posted November 21, 2011 Share #7 Â Posted November 21, 2011 Advertisement (gone after registration) nice piece of kit Link to post Share on other sites More sharing options...
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