Sironar 240mm Rear Element Anyone?

[G Benaim]

Hello,

i recenly purchased a sironar 240mm with separation in the rear element, and was wondering if anyone has one of these elements lying around that I can buy from them. Thanks.

[Steve Hamley]

You might consider having John Van Stelton at Focal point recement it if there's nothing else wrong with it. Probably cost about $180, and you don't have to worry about a mis match.

http://www.focalpointlens.com/fp_menu1.html

Steve

[Bob Salomon]

The front and rear cells are matched at the factory before the lens is shipped. You can't mix and match cells and expect proper results.

[Donald Hutton]

"You can't mix and match cells and expect proper results."

Quality control must be really bad if this is the case - I find it hard to believe that the rear elements would not be interchangeable on the same model lens - what's involved in the "matching" process?

[Bob Salomon]

" I find it hard to believe that the rear elements would not be interchangeable on the same model lens"

The lens is not a 240mm. It is ±240mm and the front and rear cells are matched depending on what the actual focal length is.