Focotar 50mm f1/4.5 from first year to last. Transmission difference.

[nfoto]

I have the Rodenstock APO 240/9. Not that good for UV even when all the extra hassles of using such a lens for landscapes are sorted.

[bobfriedman]

Yes. The APO lenses are not good and I left them off deliberately as I have a number of them. I suspect the additional coatings

[ulf]

I have the Rodenstock APO 240/9. Not that good for UV even when all the extra hassles of using such a lens for landscapes are sorted.

 

My 240mm has a cutoff (-50%) wavelength of ca 355nm and the 150mm ca 365nm.

I have assembled a combination of step rings bellow and a helicoid to be able to focus at infinity and a bit closer but never actually tried to use them for any interesting motives.

 

[Andrea B.]

There are a number of Rodenstock enlarger lenses useable for UV. Not quite the same as what you are discussing, but some of them are rather well made.

[bobfriedman]

There are a number of Rodenstock enlarger lenses useable for UV. Not quite the same as what you are discussing, but some of them are rather well made.

 

the ones i listed worked for me back in the day.. they were not APO lenses..

 

Rodenstock Rodagon 135mm f/5.6 was my best performer. but it was empirical..