Hey guys,

I'm searching for a lens to use for UV alt process enlargements. I've been talking with a guy who has already built a UV enlarger, and he has found that uncoated dialyte lenses are the best for UV transmission. He's using a kodak enlarging ektar 4" f/4.5, which is a dialyte lens, but the 10" f/4.5 version is a tessar type, not a dialyte. There is a 10" f/8 dialyte version, but that is a stop slower, which for alt processes could be significant. Do any of you know if there exists an approximately 10" or 240mm dialyte lens with a maximum aperture around f/5.6?

Thanks,
Ethan

[edit: I should mention that I need the 10" or 240mm focal length since I'm enlarging 8x10]