I agree with your comment about needing to decide whether or not we actually want art to fluoresce for the camera, but when white is brighter than white and also brighter than anything in my profile target, I think it could be a source for more problems down the road, so I'd rather filter the UV at the light source. It's not exactly a lie to view and copy the original in light that has less rather than more UV either, so I feel that it's a variable we don't need at the camera. However to meet the new ISO standards in 2009, viewing boxes and luminaries for critical viewing such as those made by GTI went from allowing none to now allowing a controlled amount of UV. http://info.gtilite.com/2011/01/where-do-you-set-your-standards/#.UaI2NZw_BP... I've seen this specification go from a lot to none to now some UV over the years so even the experts who write the standards don't always agree how things should look, so I decide in my shop what's best for my copy processes. I know one thing, my calibrated display only goes to white, not brighter than white, and I print on papers that don't have OBAs in them either so I think it's best to filter it out at the light source. Robin Meyers did some experiments for Betterlight and wrote a great paper describing this issue of IR in digitally reproducing problematic fine art: http://www.betterlight.com/downloads/whitePaper/wp_color_accurate_photo.pdf -----Original Message----- From: Iliah Borg Sent: Sunday, May 26, 2013 11:45 AM To: John Castronovo Subject: Re: B+W 77mm UV/IR Cut (486M) MRC Filter On May 26, 2013, at 11:39 AM, John Castronovo wrote:

It's still best to keep UV from exciting the artwork to fluoresce in the visible spectrum

The question is - what is it that we are trying to reproduce? If the original fluorescents, and the eye can see it,..? Other than that, the UV is to be filtered off on the light sources.

The most infamous case of IR issues with art comes from cobalt blue pigment which will turn purple on digital capture. It's common to need additional IR filtration at the camera

As I said, maybe to test the camera before mounting those additional glass-air interfaces which add flare. -- Best regards, Iliah Borg ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3343 / Virus Database: 3184/6359 - Release Date: 05/26/13