Comments on: More UV flash and torch tests

By: Mark King

Mark King — Sun, 05 Jan 2020 11:50:47 +0000

http://www.savazzi.net/photography/uv-b.html
The link above explains the different colors registered by digital camera sensors from UV light of different frequencies. For example, 365nm registers as yellow. Purple is 390-405nm and so on. I find this useful for “duotoning” while I shoot, choosing which colors go where and creating the basic foundation for the image which will then be further developed in post. It’s a lot easier when you control the colors from the beginning and give yourself something to work with. I work entirely with home-assembled UV-led lights, which you can buy in 100W power if you want (20W is perfect for me). I use these: 365nm, 380nm, 395nm. All produce distinctly different colors. Using LEDs also makes filtering much easier since you don’t have any IR light to begin with. I liked your page about the hot mirror filters, impressive attention to detail.

Mark

By: Dave Kennard

Dave Kennard — Mon, 13 Mar 2017 19:38:13 +0000

In reply to MARK COLE.

Mark, I think you’re talking about something completely different – UV induced visible fluoresence, while I’m talking about reflected UV light.

By: MARK COLE

MARK COLE — Sun, 05 Mar 2017 17:42:36 +0000

“Colour isn’t really important in UV photography since it is false colour. But there must be a reason for the difference in colour.” – visit my review of the Convoy S2+ to learn why color is important to mineral collectors – https://www.naturesrainbows.com/single-post/2017/03/01/365nm-Flashlight-Torch-The-Most-Significant-Innovation-in-UV-Mineral-Lights-in-Years