adamlang
-
Posts
4 -
Joined
-
Last visited
Content Type
Profiles
Forums
Blogs
Events
Downloads
Gallery
Store
Posts posted by adamlang
-
-
Not just trace elements, apparently these are RADIOACTIVE thorium glass element(s) in this lens, just like the concave front element FD 35/2. Unless bleached by UV light the degree of yellow to brown darkening corresponds to degree of radioactivity. SO as an act of kindness I would be willing to take the darker lens into protective custody for a mere $100 USD (g). Seriously be careful. There may be gamma radiation involved.
-
I have a pair of 55 Asphericals: the 55/1.2 AL SSC (a beautiful piece!) and a later 55/1.2 SSC Aspherical. The difference between them is easily seen through a viewfinder: the former's glass has browned substantially, while the latter remains very clear. I have also seen 55/1.2 SSC Asphericals which were almost beer bottle brown...seriously. So whether Canon made a running change in glass formulation or these anomalies are related to slightly different trace elements content (like thorium) I do not know, but to me the second theory seems more likely.
It's interesting to read Leica expert Erwin Puts' comparison of the top standard lenses done some years ago. When all was said and done, he called Canon's FD 55/1.2 Aspherical the best of the best!
Just bought my first FD Body in a while
in Canon FD Mount
Posted
Why bother? The EF automatically adjusts voltage and works great with 1.5 volt 625A alkalines....