Dichroic/Microscope Florescence Filters

Matty W wrote:

SmoothOperator wrote:

Matty W wrote:

D Cox wrote:

Matty W wrote:

I've never tried it, but I did attempt to buy those color blind glasses (that are apparently just band pass filters) to see if they would make my landscapes more vivid.

Didymium filters have more effect on human vision than they do on most cameras. They filter out the yellow, near to the Sodium wavelength, and the narrow-band filters used in typical Bayer mosaics already have a gap there.

I have used a didymium filter a bit, but I was actually thinking something more similar to this:

https://enchroma.com

Which apparently is some sort of band pass filter. (Would didymium be a notch filter? I was never good at science.) If I remember correctly, the company started out when its creator noticed that microscopic imagining filters (or perhaps it was filters for viewing lasers) also enhanced color perception.

But this isn't exactly related to the OP's interest... in florescence primarily. So never mind; I think I'm after something slightly different (more perceived color saturation like with the "trichromatic back" using a color filter). But I'm curious about the OP's question, too.

I've been using didymium filters, and the variations "enhancers" blue, green, red, warming etc. I like them.

I think they all have a notch in the orange, where they do pretty much the same thing that the enchroma glasses are doing. Though there are other effects in the blue and green.

I haven't tried the other enhancer filters, but I suspect you're right.

What I thought would be really interesting is a narrowband (I don't know the terminology) band pass filter around each chromaticity, if that makes any sense. I used to shoot a lot of Velvia and loved the saturation and remember that its spectral acceptance curves (wrong term again, I'm sure, but it's been a while since I looked at the white paper) are very narrow, whereas bayer filters seem pretty broad to improve low light performance, and I know some even prefer the color of early dSLRs to newer ones...

Phase One/Sony's trichromatic back seems to aim at something similar, but I was wondering why not a filter that has narrow acceptance peaks around R, G, and B, and blocks light elsewhere? It would essentially work as an ND filter, but would also increase perceived color saturation dramatically.

Then again, maybe something similar is possible in post:

https://www.thebrim.pictures/vivid.html

I agree, I'm interested in increasing color saturation around the filters in sort of an analog way.  Or at least to see what it looks like.  I am also interested in doing the complement with orange, teal, and violet.

Some very narrow single band filters might be interesting, especially if it is in a range that is non-standard compared to the bayer filter.

I've been doing UV then IR photos, I think it really sharpens my perception of color to do sort of monochrome photography.