Posted: Wed Feb 24, 2010 12:52 pm Post subject: UV black lamp use on Takumar 50mm F1.4 |
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beachboy2 wrote:
I have been trying to bleach yellowing of Super Tak lens. Some hot sessions in the sun seem to be too much risk from lens overheating. I found a 20 watt compact fluorescent UVA party light bulb ('black lamp") at the local hardware store. Cost was AUD $17.50, or about USD$16. I mounted the bulb in a desk lamp, aimed it down into a foil covered bowl with the Super Tak at wide open aperture. Distance was close with a few centimetres gap between lamp and bowl to enable air circulation. Now 73 hours later, yellowing of lens is almost gone. Will do another few days and report whether yellowing dissappears completely.
bb2 _________________ K5, K20D, Bigma, Sigma EX 105, Sigma EX 10-20, Sigma EX 28-70 F2.8, Sigma Ex 1.4TC,
Pentax 135 F3.5, Pentax 30mm F2.8 , Pentax 50mm F1.7, Pentax 55mm F1.8, S-M-C Tak 35mm F3.5, Super Tak 135mm F3.5, Super Tak 50mm F1.4, Super Tak 200mm F4
Vivitar 135mm F2.8, Vivitar TX 200mm F3.5, Vivitar 2X TC, Vivitar TX 300m F5.6 Vivitar T4 400mm F6.3
Tamron SP 35-80,80-210 F3.8, 300mm F2.8 360b,Helios 44M, Chinon 28mm F2.8, Chinon 35mm F2.8, 3M-5A 500mm F8, Mir 1B 37mm F2.8, Jupiter 9 85mm F2, CZJ Biometar 80mm F2.8 |