UV-B of an unknown Cactoo

[lukaszgryglicki]

Hi, I'm not a biologist, here is a visible photo (Fuji 50R + Micro Nikkor AF 105/2.8):

 

And here is UV-B (and possibly some shortest wave UV-A) version (Fuji 50R mono quartz + UV-Nikkor + IV308 + Hoya U-340 4mm, exposures 2+ min, ISO 200 or 400, f=16/22):

 

[colinbm]

It could be nice to compare the UVA with UVB in these floral shots ?

[Stefano]

You should really try UV TriColours with that lens and camera. Your setup should deliver.

[lukaszgryglicki]

Good idea, will try next time.

[Andy Perrin]

Seconding what Colin said, do some regular UV-A for comparison, so we can see the differences. Tricolor too.

[dabateman]

These are interesting. 

Do you have a 405nm type filter? That could work as a good "red", with your 308nm for "blue" and an UVA filter for "green".

Also using a wratten 47 (blue)  58 (green) and either 25 or 29 (red) would be interesting to see the color from your monochrome converted camera. 

[lukaszgryglicki]

I don't have 405nm filter, but I can use "hot mirror" from Kolari or Hoya - they are supposed to pass mostly visible.

So that would make:

- UV-B - my current stack.

- UV-A - I have maaaaaany options, but I guess UVR Optics StraightEdgeU would be best - it has very steep curve cutting around 400nm and passing UV.

- Visible - hot mirror

- Or maybe Hoya R72 - for IR.

 

That gives 4 channels to mix.

I just need time for this and perfect alignment which will be the biggest issue IMHO.

[lukaszgryglicki]

I now have even better UV-B only stack - double invisible vision 308 nm stack (I call it DIV308).