02-26-2017, 08:19 AM
Canada balsam, I don't think has been used much in modern lenses. According the Wikipedia (I don't have the link) it has been phased out since the end of WWII due to thermal instability among other reasons. I think I tend to agree with JoJu. If you can find a defective lens with an intact rear doublet that would be ideal. So my dream of fixing my 80's era lens with a little separation are probably just that.