Jesito
Joined: 24 Aug 2007
Posts: 5745
Location: Olivella, Catalonia, (Spain)
Expire: 2015-01-07
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 Posted: Sun Oct 21, 2007 6:21 pm Post subject: Fixing Pentax Super Takumar 50mm F1.4 "radiactive" |
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Jesito wrote:
Seen on the net:
http://www.rangefinderforum.com/forums/showthread.php?t=47689
It shows how to cure the yellowish tint, not sure if radiactivity goes away as well or if it's innocuous.
Best regards,
Jes.
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Jesito, Moderator 
Jesito's backsack:
Zooms Sigma 70-300, Tamron 35-135 and 70-210 short, 70-210 long, 28-70 CF Macro, 35-70, 35-80, Vivitar 70-210 KA, Tamron 70-250.
Fixed Industar-50, , Tamron 24mm, Tamron 135mm, Sands Hunter 135mm, Pancolar 50mm, Volna-3, many Exakta lenses
DSLR SIGMA SD9 & SD14, EOS 5D, Sony A700 and NEXF3, Oly E-330, E-400, E-450, E-1
TLR/6x6/645 YashicaMat, Petri 6x45, Nettar, Franka Solida, Brilliant
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Rangefinders Chinon 35EE, Konica C35 auto, Canonet 28, Yashica Lynx, FED-2, Yashica electro 35, Argus C3 & C4, Regula Cita III, Voigtlander Vitoret (many), Welta Welti-I, Kodak Signette 35, Zorki-4, Bessa-R & L, Minolta Weathermatic, olympus XA2
Compact Film Konica C35V, Voigtlander Vitorets, Canon Prima Super 105, Olympus XA2 and XA3
Compact Digital Olympus C-5050, Aiptek Slim 3000, Canon Powershot A540, Nikon 5200, SIGMA DP1s, Polaroid X530, IXUS55, Kodak 6490, Powershot G9 and G10
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blende8
Joined: 29 Sep 2007
Posts: 260
Location: Bremen, Germany
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| Posted: Fri Nov 09, 2007 9:10 am Post subject: |
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blende8 wrote:
Yes, this works.
The point is that over time the glas structure is changing.
There are rumours on the net that this has to do with radioactivity or rare earth elements. But this is not clear.
What is clear though is that it seems that UV light is changing the glas structure back to its original state.
It works better when you put the lens in front of the window glas, if possible, because the glas is blocking UV light.
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Best wishes, Wieland
K-1, K-5IIs
Pentax, mysterium quod absconditum fuit ... |
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