UVF First tests with new (Nemo) torch

[Adrian]

I've finally got around to testing the new (Nemo ?) torch against my Convoy. In the examples shown, the Nemo is in the centre, and Convoy on the right. All UVF exposures 10 seconds @ f/16, light painted. Because the subject is relatively small in relation to the torch I suspect the narrower beam of the Convoy compensates for the lower power. I will try to do some more using a more scientific approach!

Subjects are Rudbeckia "Marmalade" and Gazania (unknown variety)

Camera: Nikon D850 with 105mm micro Nikkor. 200 ISO

[colinbm]

Good work Adrian, I am a bit surprised.

What is the diameter of the flowers centre with the nice cyan ring please ?

[Cadmium]

Adrian, Great tests.

I see more red color in the Convoy shots, the pics on the right, at least with the rudbeckia shots.

Do you have filters installed in the Convoy torch, if so what filter are you using in the torch?

I am assuming you left the filter in the Nemo that came installed in it?

[Adrian]

Thanks for the comments and queries.

The central "ring" of the Rudbeckia flower was around 2cm in diameter. The Gazania around 3cm.

My Convoy torch is fitted with a U-340 filter. Yes I left the supplied filter on with the new torch.

Both torches were held at the same distance (as near as possible) from the subject.

[colinbm]

Thanks Adrian

[Cadmium]

Adrian, To me they look very close, I don't see any difference in light intensity. Just the color, like I said, and I don't know why the color would be different.

I think the Nemo has ZWB2, being more like UG1 and U-360 than like U-340, however there is the question of that little blip in the visual range with the Nemo, I don't know how much that mixes into the results.

Myself, I have not noticed any fluorescence color difference between the two torches with my eyes, but I have not tried them with a camera yet.

Your D850 is stock? Any barrier filters being used on the lens?

[dabateman]

If the green ring is behind the Zwb2 filter, then there is no visible signal.

But the Zwb2 will let through more 390nm than the U340 filter. However, my Nemo seemed to be fairly tight, without too much light above 390nm.

 

 

[Cadmium]

Yeah, you might try putting the O-ring behind the filter and compare the torches again.

https://www.ultravioletphotography.com/content/index.php/topic/4051-convoy-s2-has-a-challenger/page__view__findpost__p__38304

[nfoto]

Thanks to the generous assistance of UlfW, I finally got my eager hands on a pair of the NEMO torches. They are very powerful and hopefully I'll use them in a number of applications from now on.

 

Here is a quick and dirty example to show the NEMO in action. UVIVF of a floating-leaved community comprising Ricciocarpos natans and Lemna minor.

 

 

Nikon Z7, Micro-Nikkor 60mm f/2.8, NEMO

 

I for one will keep the fluorescent green ring on the front bezel as it reminds me the torch is switched on

[colinbm]

Nice soup....

[Adrian]

That is a lovely image Birna! Was there as much detail in the leaves of the Ricciocarpos in visible light?

[nfoto]

Yes, and no. The air spaces are much more prominent in UVIVF. The dorsal structures of Lemna are better visible in either UV or visible light than in UVIVF.

[Stefano]

It seems some sort of abstract art. You may use it as a screensaver.

[Andy Perrin]

There used to be a contest for best microscopy-as-art. I do not recall the name of it or any details, but this could easily have been one of the winning entries.

[dabateman]

Andy,

The Nikon small world microscope photo competition is annual and was starting just before I was born.

 

https://www.nikonsmallworld.com/

 

[nfoto]

Well, image magnification here is just shy of 1:1 so would not qualify for 'microscope' photography

[Andy Perrin]

True about that! But it reminded me of the Nikon competition (which is indeed the one I had in mind, thanks David).

[dabateman]

Well, image magnification here is just shy of 1:1 so would not qualify for 'microscope' photography

 

Actually you just need a light microscope and image using light. Electron microscopy or magnetic scopes don't qualify.

But a stereo disection scope would, and I have seen a winner at 0.5x.

[Cadmium]

Thanks to the generous assistance of UlfW, I finally got my eager hands on a pair of the NEMO torches. They are very powerful and hopefully I'll use them in a number of applications from now on.

 

Here is a quick and dirty example to show the NEMO in action. UVIVF of a floating-leaved community comprising Ricciocarpos natans and Lemna minor.

 

 

Nikon Z7, Micro-Nikkor 60mm f/2.8, NEMO

 

I for one will keep the fluorescent green ring on the front bezel as it reminds me the torch is switched on

 

Birna, Oh wow, this is an amazing photo! Wonderful.