Peter_Jones
Well-known
I have an Industar 61 which I have recently lubed, and whilst apart I noticed the rear element's coating was flaking off, I blew off the loose coating but now when looking fron the front of the lens there is a strong reflection in the centre - is there any way to remove the rest ?
Unless you are getting Newton's Rings or other problems with the remaining portion of the coating, I would leave it alone. It still does its job over the area it covers- reduce reflections.
You can remove coatings with a mild abrasive and LOTS of rubbing. Some use fine silver polish. You can also use Cerium Oxide- check Ebay for astronomy supply stores.
You can remove coatings with a mild abrasive and LOTS of rubbing. Some use fine silver polish. You can also use Cerium Oxide- check Ebay for astronomy supply stores.
Limpovitj
Established
I had pretty much what your talking about, only mine was caused by fungus (cleaned it off, glass O.K., but the coating gone where the fungus had been). I removed the rest of the coating, as suggested by Tomosy, with polishing tooth paste (and a whole pack of Q-tips). I took a couple of hours, but the result was perfect. No one could tell anything has ever been wrong by looking at the lens.
However, as Brian says, why bother? Tomosy says an uncoated element is better than one with half the coating gone but gives no reason, and I can't see why. I shot several rolls with the coating half gone, and I can't tell anything from looking at the pictures (and to be quite honest, I can't tell them apart from the later ones wihtout coating, either (but I know which are which from the negative sleeves)).
Perhaps it depends on which surface it's on. I removed it mainly because it annoyed me, I suppose.
Shoot a roll and see if you like the results before you do anything.
(Edit: My coating woes were on the first surface of the second element in a Tessar-type lens.)
However, as Brian says, why bother? Tomosy says an uncoated element is better than one with half the coating gone but gives no reason, and I can't see why. I shot several rolls with the coating half gone, and I can't tell anything from looking at the pictures (and to be quite honest, I can't tell them apart from the later ones wihtout coating, either (but I know which are which from the negative sleeves)).
Perhaps it depends on which surface it's on. I removed it mainly because it annoyed me, I suppose.
Shoot a roll and see if you like the results before you do anything.
(Edit: My coating woes were on the first surface of the second element in a Tessar-type lens.)
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