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04-03-2015, 02:57 AM   #1
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Tamron 60b disassembly instructions / service manuals

I`ve got a Tamron SP 300/2.8 LD IF ( Adaptall-2 model 60b ) from EBay. It is quite nice lens but there is one moment of which I am worried about.



It has some specs at a rear group of lenses. Some of that specs looks like dried stains around the border of the lenses. And there is one looks like some small piece of a fungus. Fortunately that all issues are not affecting on the photo. But I would like to clean up the lens to prevent fungus growth (if it is a fungus).



A problem is that I need to get in to the lenses behind of the aperture blades. That means I will need to disassemble a lens tail including aperture mechanism. I would like not to do that untill I will definitely know that it will help. So I need to find some instructions or service manuals for any adaptall-2 SP lenses (I believe they have similar disassembling sequences). May be someone has experience of cleaning such lens and may advise where to start?



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Last edited by andreybs; 04-03-2015 at 03:52 AM.
04-03-2015, 04:38 AM   #2
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Exposure to UV light should be enough to kill the fungi, as a stop-gap solution.
You could try leaving the lens in direct sunlight or using a UV lamp (EXERCISE EXTREME CAUTION AS UVs ARE DANGEROUS FOR EYESIGHT) as has been previously tried by another forum member here:
https://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/278966-can-...-safe-use.html

I'm not to be held responsible if you try and fry your retinas...
04-03-2015, 05:03 AM   #3
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QuoteOriginally posted by LensBeginner Quote
Exposure to UV light should be enough to kill the fungi, as a stop-gap solution.
That was the first I have done. I`ve used common household UV irradiator (for disinfecting the room space) for a 30 minutes. The light was sent directly into the rear lens. But you see there are at least 3 reflecting surfaces with multi-coatings. Do you think UV rays might kill fungi in such case?
04-03-2015, 07:07 AM   #4
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Don't worry about a few spots! Not likely to have any effect on IQ. Snap away. With correct storage don't worry about it growing - it wont.

Here in UK I would recommend The Lens Doctor for a buffing up of a quality adaptall like the 60B. In Russia .. well ???

04-03-2015, 08:21 AM   #5
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QuoteOriginally posted by marcusBMG Quote
With correct storage don't worry about it growing - it wont.
Yes, I know that dry storing conditions will not allow fungi grow up. But when used in a wild nature there are no guarantees that lens will be used in a dry conditions. That is the point.

I have some experience in repairing the lenses including cleaning the lenses from fungi. Disassembling of the lens is not a problem when you have special tools and knowing how use them. So if I would find a service manual or instructions for a lens then It would be easy to remove fungi by myself. Honestly I do not trust to a service center when repairing the old lenses.
04-03-2015, 08:52 AM   #6
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Do let me know how you get on Andrey, my 60B needs a bit of tlc as well (stiff aperture after getting a knock).
04-03-2015, 12:05 PM   #7
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QuoteOriginally posted by marcusBMG Quote
stiff aperture after getting a knock
Aperture lever is sticking or its blades do not return to the closed position? I suppose you are using AE mode...
04-03-2015, 12:23 PM   #8
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No, just the movement of the aperture ring. The iris is fine, and works fine with PKA mount. Problem is on my mirrorless cameras, moving the ring by hand.

04-03-2015, 03:04 PM   #9
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QuoteOriginally posted by dcshooter Quote
And UV won't get rid of any debris already in the lens.
You right. I`ve decided to postpone cleaning procedures till fungi will grow (if they will). Of course I will store a lens in a dry place. When I will disassemble it I will need your photos. Dropped email in PM. Thanks.
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