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Squeezing New Life from Old Lens
Lens: Tamron Adaptall2 35-70mm (17A) Camera: Pentax K100D Super Photo Location: QLD Australia ISO: 200 Shutter Speed: 1/4s Aperture: F8 
Posted By: Rebootoz, 02-17-2016, 08:21 PM

Full Frame is back in Vogue - time to prepare with some repairs...

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02-18-2016, 08:41 AM - 1 Like   #2

Join Date: Feb 2015
Location: Nizhny Novgorod
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The vice-grip is scaring me : )
03-06-2016, 03:25 AM   #3

Join Date: Feb 2015
Location: Nizhny Novgorod
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What about results of the repair?
03-06-2016, 03:54 AM   #4
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Join Date: Oct 2015
Location: Queensland
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Original Poster
I acquired the lens with a smashed filter ring, and it was full of spider-web type fungus.

Removing 5 of the 7 elements was relatively straightforward.

However, one of the groups of multiple elements needed to be separated outside of the lens, which is difficult to hold with one hand, and unscrew with the other (hence the lightweight vice with soft jaws).

To access the last two elements requires some serious dismantling of the lens, and it didn't look too bad at that point, so I decided to skip and rebuild it.

One of the test shots of the rebuilt lens is attached.

Under further testing the lens exhibited a little bit of flare in strong backlit conditions, so I am going to dismantle again and clean the other 2 elements (when I get some spare time).

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