I just found this IndieGogo campaign. I thought it might be of interest to alternative process photographers. It lets your smartphone tell you the UV index right where you are. This seems like it would be useful in determining exposure times for sun printing. I funded it and I hope you do too because it isn't yet to their goal. Considering I recently had problems with outdoor exposures due to a low UV index, I think this would be a really useful tool, so I really hope this gets funded and made.
Does anyone know whether the UV light measured by this is the UV light photographers are interested in?
Originally Posted by WetMogwai
That's a good question. I hadn't considered that.
AFAIK, UV index is biased towards UVB/UVC - those wavelength which is more likely to cause sunburn. Alt-process is sensitive in the UVA range (~365 nm)
Interesting, because the information on the Kickstarter page seems to reference UVA.
Originally Posted by Hexavalent
It also indicates (way down near the bottom):
- Peak sunlight response bandwidth: 290 - 298 nm
- Totalsolar response: 290 - 400 nm