Common lawn flowers

[Cadmium]

Ulf, we have already discussed it privately, I won't make anything thinner than 1mm. Get it from ITOS.

 

This graph is for Colin who wanted a BG25 comparison, and here are other comparisons also.

Note: these are not all the same thickness.

 

I will try to do a graph comparing BG24A and Russian ПС11, and also compare both directly in photos. Those have the most red.

 

[colinbm]

Nice to see, thanks Steve

[Ninjin]

Did you use Gel or glass?

 

My filter is 1.5 thick, the seller wrote - "RESIN". I'm not sure what that means, maybe any plastic. But this is not glass, it bends easily. It had no packaging or data. Only sign # 47 on the surface. I bought two pieces. Both are 1.5 mm thick.

I will add a photo of filter later..

 

Ок, I found my tests with 'green result'.

 

Wratten 47 1.5 mm + S8612 1 mm (top).

Wratten 47 1.5 mm + S8612 2 mm (bottom).

 

 

Wratten 47 3 mm + S8612 1mm (top).

Wratten 47 3 mm + S8612 2mm (bottom).

 

 

The graph for Wratten 47 - I took it from link. I do not know the author. (No English)

http://www.astronomi...Bz0LAxss8T_CbOY

 

[colinbm]

Wow, That make so much difference.....

[colinbm]

Ninjin, are you using a UV capable camera & lens, that are able to record down to say 360nm, Please ?

[Ninjin]

using a UV capable camera

I don’t have any quartz lens.

I use Nikon 7100 converted full spectrum on Spectrosil 2000 glass +

striped lens Kuribayashi 3,5 35 + ring 42-42 (about 3-4 mm) on the lens, for macro flowers.

[Ninjin]

Here is a small comparison ПС11 with BG3 - I did it on a diffraction grating. I wanted to see the visible red. There is some visible green as well, but not much.

 

[update]: In the example I posted earlier - a significant mistake was made in glass marking.

Please see the test later.

[dabateman]

So BG24A is not equal to an NC11 filter than. Cadmium has lots of signal above 420nm in his plots, whereas you see nothing. NC11 might be more like UG1 then.

 

[Cadmium]

Compare BG24A and Russian ПС11 for your self below.

I compared both today in photos, there is no difference, they both work the same.

 

Russian ПС11 is not like UG1.

 

 

[Cadmium]

UV shot, using La La U. Too much wind...

1.3s, f/8, ISO 200

[colinbm]

I don’t have any quartz lens.

I use Nikon 7100 converted full spectrum on Spectrosil 2000 glass +

striped lens Kuribayashi 3,5 35 + ring 42-42 (about 3-4 mm) on the lens, for macro flowers.

Thanks very much Ninjin

[Cadmium]

I didn't know I had this flower growing here. I think it is called Buttercup. Pretty windy...

 

 

[Stefano]

Did you increase saturation? Those are really nice colors.

[Cadmium]

Did you increase saturation? Those are really nice colors.

 

Nope, not at all. Those are just white balanced in Photo Ninja, resized in Photoshop, nothing else.

[Stefano]

I think that the range of UV colors we have (including green at 340 nm) is quite amazing for a sensor never meant to be used for UV.

[dabateman]

Here is a small comparison ПС11 with BG3 - I did it on a diffraction grating. I wanted to see the visible red. There is some visible green as well, but not much.

No visible blue - if add GG420.

I did not make a comparison with Wratten 47 on the grating yet, so need to try.

 

 

 

Based on Cadmium's plots are you sure your NC11 is NC11 and not NC13? You have no signal after 420nm in your spectrum. But the plots Cadmium shows looks to have lots of signal above 420nm.

[Ninjin]

no signal after 420nm

 

You're right, that looks weird.

I was so passionate about red part, and I didn't quite pay attention - why there is no blue. Now I do not know why there is no blue, in my test.

 

If stack GG420_2 mm + S8612_2 mm + BG24A_3 mm (or ПС11_3mm), so it still allows to get visible blue, according to the graph? I would suggest the blue should be, yes.

 

Ок, I will do a new grating test again - to make sure if I made any mistake. I am going to repeat the test for ПС11 and for Wratten 47 a new one.

[Cadmium]

ПС11 and BG24A are a strong deep blue to the eyes, so yes, there is blue.

Ninjin was the first to invent these various ПС11 stacks, I simply used BG24A in place of ПС11 to try what she has already discovered.

 

To answer the question of how close are the Russian ПС11 and the Schott BG24A, here is a direct comparison I made today in direct sunshine.

It should be noted that I have noticed quite a bit of difference in color results between direct sun and shade with these filters more than some filters.

 

Buttercups and English Daisy, ПС11 5mm + S8612 1mm stack

 

Buttercups and English Daisy, Schott BG24A 5mm + S8612 1mm stack

 

Dandelions and English Daisies

[Cadmium]

Here is the same shot using U-340 8mm filter (alone, no stack). WB with Spectralon.

3s, f/8, ISO 200

[Andrea B.]

I was wondering how long that 8mm U-340 photo took? Are they really long?

[Cadmium]

I was wondering how long that 8mm U-340 photo took? Are they really long?

 

Hi Andrea, I updated that post to show the settings for you above, then compare those setting with the settings I updated the La La U version of the same shot on previous page:

https://www.ultravio...dpost__p__35154

 

U-340 8mm = 3s, f/8, ISO 200

La La U = 1.3s, f/8, ISO 200

 

 

[Cadmium]

Here is a quick test using ISO 6400 for hand held.

This is Wratten 47 gel + S8612 1mm. I first tried it with a Tiffen 47 glass filter, but it white balanced to be almost purely monochrome. There may be something wrong with that Tiffen 47 glass filter, I don't know.

Interesting using the Wratten 47 gel filter, but not what it was suppose to look like.

 

Look here for Ninjin's version:

https://www.ultravio...dpost__p__35103

 

Wratten 47 gel + S8612 1mm (high ISO for hand held, pardon the noise/grain).

t:

[Ninjin]

Cadmium,

Thank you very much for the photo!!

Your result - if looks like close to stack with 2 mm S8612, for my..

I guess this difference is - because the difference in camera sensitivity for IR? probably.

 

Can you try 0.5 mm S8612, please, not for 1 mm?

If will not show the red UV center, then this is the difference in the gel filter.. But I think it will show.

 

Here is my 2 filters # 47 looks like:

 

[Stefano]

I don't think he has S8612 that thin... maybe 1 mm thick BG40 can mimic 0.5 mm thick S8612.

[Ninjin]

BG40 can mimic

 

Maybe, but I don’t think BG 40 is suitable. It will be almost the same, probably.

If almost 2 times need reduced block IR.. 0.5 or maybe 0.75 mm S8612 should work then?

 

I think reason here - the IR sensitivity for camera vary. But maybe another reason.