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Post by physiognomy on Sept 27, 2006 21:24:12 GMT -5
Hi,
I am wondering whether anyone can help?
I just bought an 'as is' chrome Canon 50/1.8 (ser. #104715) that was stated to be free of haze/oil on the blades... Well, it turns out that it has some of both... While I'm not too happy it is a really nice lens otherwise and I didn't pay too much for it. I have written off a complaint to the seller, but I'm wondering if anyone knows how hard it would be to repair? I'm not looking to invest $$$ in repair by DAG or Sherry K. as it will likely double my total outlay for the lens.
Any help/info would be greatly appreciated.
Thanks!
Peter
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mickeyobe
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Posts: 7,280
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Post by mickeyobe on Sept 28, 2006 3:09:00 GMT -5
Peter,
Does the oil on the blades effect the operation of the shutter/aperture?
If not, why not leave well enough alone?
Mickey
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Post by physiognomy on Sept 28, 2006 11:14:34 GMT -5
Peter, Does the oil on the blades effect the operation of the shutter/aperture? If not, why not leave well enough alone? Mickey Hey Mikey, The oil is doing no harm to the aperture as it clicks through the range well. My worry is that the haze on the internal lens element directly behind the blades is caused by the oil... If I were to have someone clean it up (I am not brave enough) I would be concerned that it would return before long... The seller wrote back this morning & accused me of tampering with the lens (why are some sellers on ebay such a piece of work?) so I guess I'm stuck with it... What I found funny was the statement that the oil on the blades was caused by being thrown about during shipping... I'm tempted to write back & ask what that sais about his packing, but I guess I'll let it lie... For $85 + shipping others have probably had worse. As it is now the haze isn't bad & only tests will tell whether it will accentuate flare or reduce contrast/sharpness... Anyone had one of these lenses apart? Thanks, Peter |
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Post by kiev4a on Sept 28, 2006 11:27:32 GMT -5
If it's an RF lens oil on the blades usually isn't considered a big deal. On an SLR lens it is.
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mickeyobe
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Posts: 7,280
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Post by mickeyobe on Sept 28, 2006 12:36:36 GMT -5
Peter,
If the rear element isn't recessed too deeply you should be able to unscrew it with your fingers. When reinstalling it, turn it counter clockwise slowly until you hear or feel a faint click. That should eliminate the possibilty of cross threading or stripping the threads. Then turn it clockwise gently but firmly to tighten.
Leave the aperture blades alone other than very lightly dabbing, NOT RUBBING, them with a Q Tip.
Mickey
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Post by physiognomy on Sept 28, 2006 22:58:53 GMT -5
Peter, If the rear element isn't recessed too deeply you should be able to unscrew it with your fingers. When reinstalling it, turn it counter clockwise slowly until you hear or feel a faint click. That should eliminate the possibility of cross threading or stripping the threads. Then turn it clockwise gently but firmly to tighten. Leave the aperture blades alone other than very lightly dabbing, NOT RUBBING, them with a Q Tip.Mickey Not too sure I'm game to stick my fingers anywhere in there... The last thing I'd want to do is mess up the rear element... Thanks for the advice & I'll remember your tip about aperture blades... they do look so delicate! Is it the Black version or all-chrome version? The chrome version comes apart from the back. You will need a spanner and set of very thin needle-nosed pliers. The retaining ring for the element that you need to clean is inset, but reachable.The affected surfaces are probably on each side of the aperture blades. The bad news is the oil used in the Canon RF lenses tends to etch the coatings, and even glass, if left in too long. I had one out of four that had damage to the coating. An RFF member had one with etched glass. Brian, mine is the chrome version... I thought it would require some not-so-easy (for me)disassembly to get to the affected lens surfaces. Not good news about the possibility of coating damage... The haze is fairly light & only visible at certain angles with light shining in on the rear element. It does sound like I need to do something about this before it gets any worse though... Without having the tools you mention do you think it is something I'm better of sending to someone? Thanks, Peter |
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