I recently got a 18 inch focal length rapid rectilinear lens. I have some haze in the front
Cemented element. Any advice to get rid of it? The glass is nice and throws a nice picture
Even with the haze present, but I would like to get rid of it.

Have you taken the element out to clean the inside of the glass? If it isn't on the inside it is probably the cement that holds the double element together. They can be re-cemented but I'm not sure how much that would cost you. Maybe someone else on the forum can ???

I came to the conclusion that there is a separation and the balsam is causing the yellowing.
What is the best way to separate the lenses and re-cement them?

Thanks!!!

soak the element in kerosene for a few days/weeks. eventually they will slip apart. you done need cement to reinstall, just clean and put into the cell. haze on the front element is not as bad as haze on the rear.