Hellow from Poland (Minsk Mazowiecki)

[Doug A]

Exciting news @lukaszgryglicki. Can't wait to see how it performs. Have you decided what the 1st project will be? 

 

Thanks for sharing,

Doug A

[lukaszgryglicki]

I'm going to use it as a daily camera, "project" will be to photograph under KrCl 222nm light.

I *think* it may work.

- Camera with quartz glass (passing from 180nm).

- UV-Nikkor (good down to 200nm).

- Edmund Optics 220nm bandpass filter.

- 40W 222nm KrCl lamp (radiant power probably around 2W or hopefully more).

 

[Andy Perrin]

The hard part will be proving that it’s not contaminated by any other out of band light. 

[lukaszgryglicki]

That is very true sir.

 

[lukaszgryglicki]

Fuji arrived to my hotel in Detroit. I only have one lens (GFX 50/3.5 pancake) and only Hoya R72 or full spectrum - those are some first shots ever.

Obviously 50/3.5 have IR hotspot.

I also have SEU Mk2, didn't tried yet. Will do probably tomorrow.

 

[Stefano]

That hotspot is barely visible, it doesn't look bad. I think I can see it in the first image and a few others only.

[lukaszgryglicki]

A few more, later this day...

 

[colinbm]

Nice collection of photos.

[dabateman]

I look forward to your tests when you get it back home. 

Should be a fun monochrome camera though in the mean time.

Do any of the fuji film modes effect the results? 

[lukaszgryglicki]

Only mono makes sense, all others are just pink-white.

[lukaszgryglicki]

So I'm able to shoot with both Hoya RM90 (50% transmission at 900nm and then more above 900nm) and even (unexpected) UVR optics UVBplus (this one: https://www.uvroptics.com/index.php?UVBplus).

I only have Fuji GF 50/3.5 GFX native lens, so waaaay to modern to pass much of UV, so this probably get upper upper part of UVBplus curve - exposure times are seconds in full daylight, but I'm able to see through EVF and focus using Lv which is totally unexpected. Note black windows of our hotel in IR (I was scared inside hotel that I can't make IR photos, I was thinking that Dan forgot to remove IR blocker, but those are just hotel windows), also note hotel name in UV (it is not visible at all). For UV focus is poor - I have no tripod and was just supporting against the walls. IR images have serious hotspot (it was less visibl with Hoya 720, but very visible with Hoya RM90)

So I'm expecting to have a lot more fun with UV-Nikkor when I get back home.

 

[Stefano]

Yes, that hotspot is more visible now, many modern lenses have it in IR.

 

I love those dark skies.

[colinbm]

Nice work Lukas

[lukaszgryglicki]

OK now a few tests of SEU Mk2 - all handheld.

Looks like me & my wife changed skin color... :D

[colinbm]

A good collection Lukas

[lukaszgryglicki]

Thanks, goodbye (foggy today) Detroit.

 

[lukaszgryglicki]

Some UV-B only photos (Invisible Vision 308nm bandpass + Hoya U340 4mm to kill IR leaks even more).

GFX 50R mono/quartz + UV-Nikkor.

Processed by AccuRaw monochrome.

f around 8-16, t around 15s-2min, ISO usually about 400-1600.

 

I already rp4esented this stack before and it has no leaks, even in UV-A, my window glasses are pitch black and when I close window I cannot do any photo indoor no matter ISO 12800 or even Hi1/Hi2 and exposure 4minutes or more, f at 4.5 (max), but when I open window all is quite good, only the amount of UV-B is extremely low, even outside.

When I checked charts for IV 308nm and Hoya U340 it looks like I'm getting mostly 300-320nm.On the last photo, there is a bus car - it is white in normal light... glasses are transparent but not in the photos.

 

[colinbm]

Good to see some UVB.

[ulf]

4 hours ago, colinbm said:

Good to see some UVB.

Colin, you cannot see UVB! it is way beyond the visible range!!! 

( I know what you ment to say)

[dabateman]

Thank you Lukas for these images.

I have been waiting for some of your tests.

[lukaszgryglicki]

This was the first sunny dany that I had any time to do anything, will be much more when I have time - this is what I miss all the time.

 

[Andy Perrin]

Yep that’s UVB. It’s a dark dark world out there. Kind of suits the winter solstice. 
 

Can you also do the same stuff in UVA so we can see how it changes?

[lukaszgryglicki]

yeah I can, but dark & rain today & a lot of work.

 

[lukaszgryglicki]

BTW: I would really really like to see UVC world, but I know its impossible - UVC is only limiteted to small items that I can iluminate with my UV-C sources, but I still think I'm getting mostly leaks :-(

 

[ulf]

The black windows of the "bus car" is not a sure sign of UV-B because most modern cars use special laminated safety glass.

 

It is a three layer laminate where the outer layers are rather thin glass, while the inner layer normally is made of polycarbonate.

Polycarbonate transmit just a bit of the UV-A spectrum if at all.

 

Here is an example of how a reasonably modern silver metallic car looks like photographed with a typical UV-A stack: