Jump to content
UltravioletPhotography

blue,purple and a bit of UV+IR


Recommended Posts

ПС11+СЗС23 filters

purple glass ПС11 5mm, blue-green glass СЗС23 3mm

 

post-237-0-23997100-1558602874.jpg

 

Olympus em5FS, Ennalyt 35 3.5

 

SOOC

post-237-0-79826200-1558603075.jpg

 

processing: added color saturation, contrast and sharpness

post-237-0-52543300-1558603153.jpg

 

post-237-0-13176800-1558603191.jpg

 

 

I can't understand it is good or bad. beautiful or not. Two colours only - brick and turquoise

to be or not to be that is a question :)

Link to comment

How much ultraviolet there is in these pictures? a small amount of ultraviolet is here, but its influence can be seen in comparative photographs

 

look at structures on the roof

 

lens sigma 30 2.8

post-237-0-61268000-1558620567.jpg

 

lens Ennalyt 35 3.5

post-237-0-68904500-1558620028.jpg

 

ПС11+СЗС23 filters give differences in color coinciding with differences in brightness in UV

 

post-237-0-23274900-1558620385.jpg

Link to comment

ПС11+СЗС23 is basically a UV+Blue+Green+Red/IR stack (bird vision or bee vision stack).

NC11 is like UG5 (or U-330), and C3C23 is closest to BG38, especially as far as red/IR suppression, however C3C23 doesn't provide as much UV depth,

but that aspect doesn't matter much in this UV+Blue+Green+Red/IR stack.

Link to comment

I kind of like the brown trees. Would work well with a good innerforest shot.

 

This stack would be similar to a B370 with a BG38. I have those and should test it.

Link to comment

Cadmium,

thanks a lot for the description of the filters with similar transmission

Green=500-560-565nm. I don't think there is transmission the green through these filters. at least in an amount that may affect the image

Yes, red goes through

 

dabateman,

It is very interesting to see how it will turn out with your filters. What similarities and differences will be.

I tried to shoot under the forest canopy, but i can't shoot without tripod on f11. My Ennalyt photos are very poor quality with a more open aperture

therefore, only such a picture. in the open space in the forest

 

post-237-0-18771500-1558676772.jpg

 

with processing - color saturation, contrast and sharpness

 

post-237-0-93534700-1558676815.jpg

Link to comment

Eka.

Your last photo is excellent. Old man young man at the cross roads with the exact tree cover I was thinking.

Link to comment

Cadmium,

thanks a lot for the description of the filters with similar transmission

Green=500-560-565nm. I don't think there is transmission the green through these filters. at least in an amount that may affect the image

Yes, red goes through

 

Eka, Great pics!

 

Yes, it does not appear that these stacks have green, but they do have some green, enough green to consider it part of the mix, given that green is stronger than UV and violet.

Consider the 1E-03 line on the diabatic graph, which cuts off at about 530nm.

In most cases I use UG5 (U-330) 1.5mm thick with S8612 2mm thick. On these graphs I am showing the UG5 (U-330) 2mm here to compare to your graph.

With a UG5 (U-330) 1.5mm stack you get slightly higher transmission even a little more green.

Regardless, your stack is like the UG5 (U-330) 2mm + BG38 2mm stack. Such a stack using BG38 doesn't fully suppress the 700nm red/IR. Your graph should be like the first Diabatic/Linear graph pair I show below.

Changing the UG5 to 1.5mm or even 1mm will raise the full range of visual transmission adding an uninterrupted, albeit tapered, UV+Blue+Green+Red transmission, what some call 'bird vision', or more accurately defined as a UV+Blue+Green+Red stack. Such stacks conveniently have higher transmission in the UV range which helps to equalize the mix of UV and visual.

 

"Eka Vision" UV+Blue+Red+Red+IR

post-87-0-89312000-1558758392.jpg

 

"Bee Vision" UV+Blue+Green

post-87-0-33963500-1558757338.jpg

 

"Bird Vision" UV+Blue+Green+Red

post-87-0-54968600-1558757358.jpg

Link to comment

Steve, thanks! and thank you for the graphs and explanations. In my case the situation with green is worse because ПС11 thickness of 5mm. I have no glass other thickness, but I probably will order to whittle down the glass to smaller thickness. I have УФС1. This is a closer analogue to UG5.

УФС1 3mm + СЗС23 3mm stack gives green trees, not brick color.

Maybe the trees will be green with another IR-cut filter or other thickness. for example with S8612

 

post-237-0-78541900-1558767535.jpg

Link to comment

Looks about the same as your NC11 if you ask me, other than the thickness.

Do you have such a linear graph of the NC11 to compare?

Those Russian graphs are not horizontally linear. Quite perplexing to compare with any other normal graphs.

Someone needs to enter the data from those Russian graphs into the Schott program and generate some normal graphs.

Not easy to do, time consuming and laborious.

 

I don't have anything against Russian filters, not like I do about Chinese filters.

My opinion is that Russian filters are well made.

However, the Russian filter graphs are completely ridiculous because of the weird nonlinear horizontal gradual compression of the nm data,

making them extremely hard to compare to any horizontally linear graph, without doing laborious resizing of about every 100nm portions of the Russian filter spectrums in Photoshop to align each 100nm to something normal.

I have no idea why they make those graphs like that, maybe just to drive me nuts, but they are very weird and hard to read accurately.

Also, remember the Russian filters have no actual nm DATA, There are no 'DATA Sheets' for Russian filters that I have ever seen, only the graphs, so they can not be entered into other programs from numbers, only by reading and eye-balling those weird graphs.

Which is not impossible, but no where accurate.

Sorry, I guess I sound frustrated by Russian graphs, because I am. They are frustrating, misleading, and they need to be updated.

Also, not many people have Russian filters?

Also, the Russian filters I have encountered are thick.

The best filters are Schott, they make the best glass in most cases, and they have the absolute best data and graphs of any filter maker in the world.

Hoya is next, but a fairly far comparison to Schott.

No one compares to those two, but Schott is the best.

Link to comment

I find a very few linear graphs. perhaps more effort is needed to search for graphs and - the better- in numerical tabls. Available graphs - it's mainly old graphs, from Soviet times. uncomfortable. also, the graphs are different from different sources.

Yes, I many times have thought that it would be good to find the number tabls and make a normal graphs.

 

purple glass ПС11

UV glass УФС1

IR cut glass СЗС23

post-237-0-24879900-1558773916.jpg

 

UV glass УФС1

post-237-0-31763300-1558773895.jpg

 

UV glass УФС1 1mm and 5mm

post-237-0-48010500-1558773992.jpg

Link to comment

Eka, Yes, my apologies to you, I was wrong.

ПС11 is not like UG5, and it is not even exactly like BG3, in fact it is equivalent to BG24A, which is no longer in production and very hard to find.

I have ПС11 and BG24A, and they work exactly the same, given the correct thickness. They are very similar to BG3 and BG25, but they transmit more red.

post-87-0-39883400-1558825965.jpg

 

Also, yes, your УФС1 is like UG5 (U-330), given the right thickness. By the way, this УФС1 graph is not linear either. The Schott graph I superimposed on top of is linear.

 

Schott black line = T version

Schott colored lines = Ti version

 

post-87-0-02469200-1558850061.jpg

Link to comment
Beautiful colours, similar. But the sky is not blue with such BG. I have some blue and purple glasses with similar transmission graphs. The sky turns red shades with them. This is also beautiful, of course. But different...
Link to comment

Hi Eka, Yeah, I only posted that pic because of the foliage colors, etc.. The sky in that one is overcast, so no blue. I can't find any BG3 + BG38 that have a blue sky, all my examples are overcast.

And that may not be BG38, it might be S8612. I will test it later.

What thicknesses of ПС11 and УФС1 are you using?

The ПС11 I have is 5mm thick, but I have BG24A in 2mm and 3mm thick, it is the same as ПС11.

Pretty sure your BG type glass is the same as BG38. Either that or BG40, but from the overlay it looks like BG38.

 

And also, how are you white balancing?

I can't get my camera to do an in camera white balance with BG3, BG24A, or NC11 stacks.

Tried this morning, all are too dark to get in camera custom white balance to work.

Are you white balancing some other way, or out of camera?

Link to comment

OK, here you go, this is fresh out of the camera. BG3 2mm + BG38 2mm.

So, not all 'such BG' filters are created equal of course.

Quick and simple, I white balanced in CNX2 from RAW/NEF, using full frame marquee.

Once again, I can't get the camera to do an in camera CWB with this filter/stack, thus the marquee WB.

I have not altered the colors in any way, this is as simple as I can make it.

Resized in PS, then sharpened, that's it. Sky is blue, foliage is like your ПС11 stack.

No cerulean shirts to test however. I will find some.

 

post-87-0-67807600-1559091462.jpg

Link to comment

I kind of like the brown trees. Would work well with a good innerforest shot.

 

This stack would be similar to a B370 with a BG38. I have those and should test it.

 

And yes, Hoya B-370 and Schott BG3 work close to the same, with BG3 having the more efficient transmission vs suppression ratio. See graph comparison.

post-87-0-14587200-1559092180.jpg

Link to comment

i have ПС115mm thickness, too. УФС1 3mm thick

Steve, yes, I've also made many attempts to persuade my camera to do white balance for these filters. Without results. I set the white balance at processing from the asphalt or the clouds, if they are.

The sky at your photo is blue. I have blue sky only with ПС11. and reddish with other "such BG". I'll look, maybe I'm just doing something wrong.

Although sometimes the sky with ПС11 is reddish too. Apparently, it's a fine colour balance that easily goes into red or blue depending on the conditions or small differences in the transmission of filters

 

I took pictures with Sigma 30mm f2.8 instead of Ennalyt 35 3.5.

ПС11 5mm + СЗС23 3mm

 

without processing, WB only

post-237-0-98610100-1559107043.jpg

 

processing: color saturation, sharpness, contrast

post-237-0-75599100-1559107142.jpg

 

post-237-0-33904800-1559107162.jpg

 

post-237-0-17061300-1559107193.jpg

 

and comparison with visible, with UV+. The mark is a construction on the roof of a long building

post-237-0-06636100-1559107333.jpg

Link to comment

Eka, Nice photos.

I think the closest Russian equivalent to Schott BG3 might be CC4.

Comparing here BG3 2mm to CC4 3mm. The UV depth looks different, but the visible range looks exactly the same to me.

post-87-0-65189900-1559116602.jpg

Link to comment

Thank you!! :)

I have СС4. I didn't shoot much with СС4, but the sky was reddish in those few shots. Thanks for the graphs. I'll try it again. Maybe the weather was not suitable. Or my IR-cut filter СЗС23 is different from BG38

 

This is with СС4 3mm + СЗС23 3 mm. with СС4 3mm + СЗС23 2 mm the sky is reddish too

WB from asphalt, processing: color saturation, sharpness, contrast

post-237-0-29861700-1559129704.jpg

Link to comment

Yep, red. Odd. I have seen a BG3 stack with overcast sky that looks a little yellow sometimes. Kind of like PTFE looks when it is overexposed.

But I have never seen a reddish sky.

Was that sky blue? Or all overcast.

I was surely not suggesting you use BG3 or the like, just was showing that because it works close to the same for the foliage anyway.

I have both of the ПС11 and СЗС23 filters, so I might try them, just have to wrestle the huge 5mm thick ПС11 onto the camera, mine is also big, not just thick.

Link to comment

Yes, odd. Maybe the difference is in the cameras again. Or my СЗС23 is not sufficiently similar to BG38.

It was a few cloudy but most of it was clear blue sky.

Yes, I know... We are just looking for how a filter coincides an obtained picture.

Perhaps there is no need for you to do tests with ПС11. If I have with this filter blue sky, then you will have blue, too

Link to comment

Well, I don't have CC4, I don't think. I will look, but I could try using BG38 with ПС11, and even СЗС23 with BG3.

Do you think that would be legal? ;)

Link to comment
I think that BG3+СЗС23 it would be perfect. So we will know there is no difference in the color of the sky because of the "wrong" IR-cut filter. Although there is still a difference in the cameras
Link to comment

Well, not much we can do about the cameras, but good idea to compare BG3+СЗС23 and BG3+BG38 with the same blue sky, and see if there is any difference.

By the way, have you tried CC4 stacked with your KG3 type glass? Did you see the SOOC pic I shot today using BG3+KG3?

Link to comment

Please sign in to comment

You will be able to leave a comment after signing in



Sign In Now
×
×
  • Create New...