X-rite colorchecker Vis UV UVIVFL

[DaveO]

I thought I would share some of the interminable test shots we all make, this time the excuse was that I had just got my D-750 back after a lab sensor clean and my Rayfact UV-Nikkor after a screw re-tighten. The equipment and settings are as I always use for my studio shots.

 

First Visible with Metz 15 MS flash, Baader UV/IR cut filter on camera.

 

UV with Nissin Di866 flash (modified by removing plastic diffuser) and Baader U on camera

 

UVIVFL illuminated by UV-LED with Baader U over LED and Baader UV/IR cut on camera

 

My guess is that the UVIVFL color of the wood block support is due to fluorescence of the lignin or some such compound in the timber

[JMC]

Thanks for sharing. In the bottom image, there looks to be spotty blue highlights on the wood, white tile, and even the colour checker chart. What's causing that?

[Andrea B.]

Bright blue specks or squiggles in a UVIVF photo are usually lint, fibers or dust -- all of which waste no time in leaping onto a UVIVF subject to get their photo taken. Sigh.

 

The tile might is probably scratched revealing a fluorescent substrate?

 

Dave, what's the date on your CC Passport? Mine seems a little more fluorescent than yours. My CCP is one of the "new" ones, after Nov 2014. The attached link is to a funny foto because the CCP was so horribly linted up that day. I take good care of it, really I do !!! It's that pesky static electricity.

Link: http://www.ultravioletphotography.com/content/index.php/topic/2011-color-checker-uviv-fluorescence/

[DaveO]

I bought and first used my CC Passport in January 2015. The white tile is an uncalibrated Spectralon sample, probably needs a good wash and scrub. The serial number on the CC is MSCCPP-SN# 160499, the white balance on the visible shot was made in PN using a light source calibration from the CC in that shot. I always use the same WB for my fluorescence shots.

[Andrea B.]

Thanks, Dave. We both have the new CC Passport.

I think I was was probably using stronger UV illumination in my fluorescent photo of the chart.