The Firing Line Forums - View Single Post - Loss of clarity from storing their scopes in dark safes or closets?

30Cal · November 28, 2012, 05:40 PM

I think your camera tech was thinking of the old Takumar (Pentax) lenses that yellow over time (something to do with the decay of Thorium in the glass or coating). Supposedly you stick them in the sun for a couple weeks and it'll clear up.

November 28, 2012, 05:40 PM	#11
30Cal Senior Member Join Date: December 3, 2002 Posts: 1,264	I think your camera tech was thinking of the old Takumar (Pentax) lenses that yellow over time (something to do with the decay of Thorium in the glass or coating). Supposedly you stick them in the sun for a couple weeks and it'll clear up.