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What is this? Should I run like hell?

rokphish

By rokphish
in Adapting lenses to Fuji X

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Chucktin Collaborator

Chucktin

Posted
Posted

Could be someone tried to clean the back element with a caustic (glass cleaner with an additive?) and that etched the metal. You may never know how much that effected the rest of the lens without a tear down.

 

Sent from my Pixel XL using Tapatalk

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milandro Grand Master

milandro

Posted
Posted (edited)

It looks like that you can take that metal element out by unscrewing 3 screws. I don’t think there is anything more complicated than that!

 

It should then be easy to clean although the pattern looks like it is almost something intentional ( i can see a smudge where you probably have tried to clean the metal retainer) but it is impossible that it would have been purposely done when new.

 

Is this a Minolta 135mm MD f2.8 or thereabouts? They are not special lenses but should be good and frankly speaking given their relatively small value there is nothing wrong in attempting to clean it, you won’t be losing much even if you were to damage the lens.

 

Other than that, this is not a type of fungus which could infect your camera and other lenses and it would be harmless, I think.

 

If the metal is, as I think, aluminum, it has to be a reaction to some agent producing aluminum oxide crystals.

 

Remove them and then apply a coat of black spray mat paint.

 

http://www.howtocleanthings.com/surfaces/how-to-clean-aluminum/

Edited by milandro
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mdm Experienced

mdm

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Is this a Minolta 135mm MD f2.8 or thereabouts? They are not special lenses but should be good and frankly speaking given their relatively small value there is nothing wrong in attempting to clean it, you won’t be losing much even if you were to damage the lens.

 

 

Sorry for off topic but I need an advice.

 

Milandro, I'm pretty sure you have a big deal of experience with old Minolta lenses, so could you please suggest me what may I add to my recently purchased Minolta X-700 equipped with 50mm 1.4. I'd like to add some lens in wide and tele department. I've heard it's better to avoid MD III series and get older Rokkor ones. What can you say?

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addicted2light Collaborator

addicted2light

Posted
Posted

Sorry for off topic but I need an advice.

 

Milandro, I'm pretty sure you have a big deal of experience with old Minolta lenses, so could you please suggest me what may I add to my recently purchased Minolta X-700 equipped with 50mm 1.4. I'd like to add some lens in wide and tele department. I've heard it's better to avoid MD III series and get older Rokkor ones. What can you say?

 

 

You might find this helpful:

 

http://artaphot.ch/minolta-sr/objektiv-vergleiche

 

This guy tested old Minolta lenses on Sony full frame bodies and against modern glass like the latest A and E mount offering.

 

It is mostly in German (use Google Translate), but often the images really speak for themselves.

 

On a side note, I like quite a bit my Minolta MC 24/2.8 (old version, not the new one with the 49mm filter size) and the 105/2.5 MD (latest version).

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pranfeuri Apprentice

pranfeuri

Posted
Posted (edited)

Could be someone tried to clean the back element with a caustic (glass cleaner with an additive?) and that etched the metal. You may never know how much that effected the rest of the lens without a tear down.

 

Sent from my Pixel XL using Tapatalk

I have an 135mm Minolta lens that has just the same problem and it's never been cleaned with anything.

Edited by pranfeuri
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Aswald Mentor

Aswald

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Posted (edited)

The rest of the lens looks pristine, body and glasses.

e76c70247cbad291fd0bbf9d0c9af056.jpg

 

Just remove the screws, take the cover out and wash it with water and a good toothbrush. Use a good multipurpose cleaning agent, rinse clean, dry (under the sun for a good dose of uv) and replace. Chances are It won't come back again.

Edited by Aswald
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