Archived posting to the Leica Users Group, 2017/03/21
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]That's a nice shot of your Super Takumar, Jim. I have three of them - a 55/1.8 no. 3182721, a 35/3.5 no. 3402817, and a 105/2.8 no. 3711646 - and all seem fine with no discoloration. I think lens wise, we're lucky over here in Ireland and the climate certainly doesn't seem conducive to fungus or other rot. I'll give them a spin on the A7ii shortly, but I'm next due to try my OM Zuiko 55/1.2 which is the newer version and not the radioactive one. Douglas On 20/03/2017 20:25, Jim Nichols wrote: > My slightly radioactive Pentax Super-Multi-Coated Takumar 50/1.4 is > undergoing a sunshine treatment in hopes of reducing the slight > discoloration of the 3 rear elements. The recommended exposure is > about a week, but may get extended because of bad weather days. You > may note that this photo was taken with with a Takumar 55/1.8, which > also has Thoriumdioxide glass, but is not discolored enough to notice. > > http://www.gallery.leica-users.org/v/OldNick/20170320-P3205865.JPG.html > > Comments and critiques welcomed and appreciated. >