I have been looking at reflection curves for a mirror coatings suitable for UBV photometry with an Opted SSP-3. I was little surprised at the sharp fall off for protected Al and Enhanced Al coatings below 400 nm. I believe from my readings in Astronomical Photometry by A. Henden and R. Kaitchuck that proper Data Reduction can transform observation from almost any system into reliable data. But I still wished to know if this observing community has a preferred coating, maybe 'Beral' just based on published curve; for the optics of a 10" f/8 newtonian and a 16" f/11 classic cassegrain. Note: Both OTA do NOT have a corrector plate. I see some published UV enhanced coating curves that do NOT have sharp fallout below 400 nm, but again I question whether this is wrong-headed thinking for photometric observing at 1,250 feet above sea level in semi-arid central Kansas.