mark_pw Posted August 2, 2017 Share #1 Posted August 2, 2017 Advertisement (gone after registration) I've kept my Summarit-M 90mm in the dry cabinet for some time. I recently took it out and found the rubber ring turned white or kind of greyish. I tried a cleaner pen from Lens Potion. The website is www.LensPotion.com Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/275302-lens-focusing-ring-rubber-turned-white-summarit-m-90mm-f25/?do=findComment&comment=3328572'>More sharing options...
Advertisement Posted August 2, 2017 Posted August 2, 2017 Hi mark_pw, Take a look here Lens focusing ring rubber turned white - Summarit-M 90mm f2.5. I'm sure you'll find what you were looking for!
luigi bertolotti Posted August 2, 2017 Share #2 Posted August 2, 2017 My Summarit 75 (identical in finishing) has also developed a gradual "de-blacking" of the rubber focusing ring... material isn't a top one, apparently... btw, I have not kept mine in a specific container... my feeling is that (considering that the greying, at the moment, is rather uneven on the barrel), this can be also an effect of exposure to light : a bit annoying.., so, thanks for your indication about the cleaner pen... when the gray will be well even (supposed one day it will become like this) i will make use of. Link to post Share on other sites More sharing options...
01af Posted August 2, 2017 Share #3 Posted August 2, 2017 To restore the rubber's black colour (or at least to mitigate the discoloration), you can try to scrub the rubber with an old toothbrush. Dunk the brush into warm water with a drop of dish-washing agent, shake the water off so it's just damp, not drippingly wet, and scrub. Link to post Share on other sites More sharing options...
Ko.Fe. Posted August 2, 2017 Share #4 Posted August 2, 2017 Common problem with all ribber rings on lenses. Here is most recent solution reported. Link to post Share on other sites More sharing options...
pico Posted August 2, 2017 Share #5 Posted August 2, 2017 I've kept my Summarit-M 90mm in the dry cabinet for some time. I recently took it out and found the rubber ring turned white or kind of greyish. I tried a cleaner pen from Lens Potion. It is confusing that you post an image from Lens Potion's web page rather than images showing your own results. Link to post Share on other sites More sharing options...
luigi bertolotti Posted August 2, 2017 Share #6 Posted August 2, 2017 It is confusing that you post an image from Lens Potion's web page rather than images showing your own results. Maybe is the seller's page that displays Mark' results... "co-marketing" isn't a mortal sin... (or has it a different name ?...) Link to post Share on other sites More sharing options...
mark_pw Posted September 27, 2017 Author Share #7 Posted September 27, 2017 Advertisement (gone after registration) To restore the rubber's black colour (or at least to mitigate the discoloration), you can try to scrub the rubber with an old toothbrush. Dunk the brush into warm water with a drop of dish-washing agent, shake the water off so it's just damp, not drippingly wet, and scrub. The dish washing agent is very likely to be soap based, i.e. alkaline and corrosive in nature. The agent erodes the rubber surface. I probably won't want to harm my Leica lenses by it. Canon EF lenses? May be. Link to post Share on other sites More sharing options...
mdemeyer Posted September 28, 2017 Share #8 Posted September 28, 2017 I did try the clean toothbrush technique mentioned here on mine. Did the trick. Link to post Share on other sites More sharing options...
mdemeyer Posted September 28, 2017 Share #9 Posted September 28, 2017 To be clear, no detergent and a dry, soft toothbrush. Cleaned it up nicely. Link to post Share on other sites More sharing options...
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