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Five Different Yellow Filters Stacked With A DB850 Filter.

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#1 colinbm

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Posted 21 April 2021 - 11:16

Five Different Yellow Filters Stacked With A DB850 Filter, on a full spectrum Sigma fp camera.
I had the Canon 40mm pancake lens on the camera. Did I say they go together like a hand in a glove.
I also measured the transmittance of the five yellow long pass filters, & I have posted the photos in order of shortest to longest cut on, which was between 475nm to 570nm.
The DB850 remained on the lens & each yellow filter was CWB on the camera with a grey card, before each photo was taken as a DNG Raw file.
Each DNG raw file was opened in IrfanView which automatically converted the photo to a .jpg file.
The photo was only channel swapped from an RGB to GBR. No further processing was done except to reduce the file size to 1000pixels wide.
Here are the five examples, in the order of the yellow filters cut-on wave length at 1/2 width.

PS, I have ordered a Tiffen #12 filter.

1/ Generic yellow @ 475nm, with a DB850 filters.
Attached Image: 1 Generic yellow 475nm+ with DB850 CWB swap to GBR.jpg


2/ Hoya K2 @ 475nm, with a DB850 filters.
Attached Image: 2 Hoya K2 475nm+ with DB850 CWB swap to GBR.jpg


3/ Unknown XO @ 490nm, with a DB850 filters.
Attached Image: 3 Hoya X0 490nm+ with DB850 CWB swap to GBR.jpg


4/ Schott OG 550 @ 525nm, with a DB850 filters.
Attached Image: 4 Shott 550 OG 525nm+ with DB850 CWB swap to GBR.jpg

5/ B&W 099 @ 570nm, with a DB850 filters.
Attached Image: 5 B&W 099 570nm+ with DB850 CWB swap to GBR.jpg

Edited by colinbm, 23 April 2021 - 03:09.


#2 Christoph

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Posted 21 April 2021 - 12:25

Very interesting! Looks nice! :smile:

#3 Christoph

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Posted 21 April 2021 - 12:27

Colin, do you have a Green X1? I always wondered how the DB850 behaves (in contrast to KG3) in combination with X1 and X1 plus Yellow stack...

#4 Christoph

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Posted 21 April 2021 - 12:32

Ha! Look at that: some blue trees with blue sky - that's your first image - channel mixing and a little slider work... sooo...the perfect initial image (for blue trees), if you go the standard channel mixing route, would be deep red trees and orangeish sky...

Attached Image: blue.jpg

Edited by Christoph, 21 April 2021 - 12:34.


#5 colinbm

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Posted 21 April 2021 - 12:55

Yes I do have a Green X1 to try-out with.
Ha ha blue trees, maybe I should post the before swap photos too ?

#6 Christoph

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Posted 21 April 2021 - 14:07

View Postcolinbm, on 21 April 2021 - 12:55, said:

Yes I do have a Green X1 to try-out with.
Ha ha blue trees, maybe I should post the before swap photos too ?

If you could try out Db850 + X1 ....and Db850 + X1 + K2 --- that would be awesome! Beautiful Place btw!

Edited by Christoph, 21 April 2021 - 14:08.


#7 colinbm

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Posted 21 April 2021 - 14:23

I'll try for tomorrow Christoph
This is the end of my street, we live 1.5m above sea level & it hasn't risen 1cm in 50 years.
I chose this shot as it has the most variety of vegetation.

#8 Christoph

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Posted 21 April 2021 - 14:35

Awesome - looks really tropical. Never been to the Land of Oz, but definitely will go one day! :smile:
No worries with the test - only if you have time etc...

BTW: Just took a closer look at your profile image--- is that a Bigfoot?

Edited by Christoph, 21 April 2021 - 14:36.


#9 colinbm

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Posted 21 April 2021 - 14:39

This is the bluest before the swap, it is the forth photo.

Attached Image: 4 Shott 550 OG 525nm+ with DB850 CWB in RGB.jpg

This is the park across the road from this house.

Attached Image: 4 Shott 550 OG 525nm+ with DB850 CWB in RGB 2.jpg

#10 colinbm

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Posted 21 April 2021 - 14:42

View PostChristoph, on 21 April 2021 - 14:35, said:

Awesome - looks really tropical. Never been to the Land of Oz, but definitely will go one day! :smile:
No worries with the test - only if you have time etc...

BTW: Just took a closer look at your profile image--- is that a Bigfoot?

Yes it is 'Big Foot in his Cave', it is in a children's park at Surfers Paradise, not far from here, it is a splitting image of me....ha ha

#11 GaryR

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Posted 21 April 2021 - 15:32

Awesome scenery in your neighborhood! I really like the blue version.

#12 colinbm

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Posted 23 April 2021 - 03:55

And some more....
Same set-up & routine as before....

1b/ Hoya XO 470nm+ DB850 CWB swap to GBR.

Attached Image: 1b Hoya XO 470nm+ DB850 CWB swap to GBR.jpg


2b/ Marumi Y2 480nm+ with DB850 CWB swap to GBR

Attached Image: 2b Marumi Y2 480nm+ with DB850 CWB swap to GBR web.jpg


3b/ Hoya X1 1/2 width 480-580nm with DB850 CWB swap to GBR

Attached Image: 3b Hoya X1 0.5 width 480-580nm with DB850 CWB swap to GBR web.jpg


4b/ DB850 only CWB swap to GBR

Attached Image: 4b DB850 only CWB swap to GBR web.jpg

#13 colinbm

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Posted 23 April 2021 - 03:59

And just to show you I can do a bit of UVA with the Canon EF 40mm pancake.....

Attached Image: 2021 04 23_SDI0579 Baader, CA EF 40mm lens web.jpg

#14 Christoph

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Posted 23 April 2021 - 09:20

x1 is spectacularly unspectacular! Thanks for testing! It‘s so close to just the DB850 - meaning it acts like a DB850, hence the good „Aerochrome properties“....

#15 colinbm

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Posted 23 April 2021 - 09:42

View PostChristoph, on 23 April 2021 - 09:20, said:

x1 is spectacularly unspectacular! Thanks for testing! It‘s so close to just the DB850 - meaning it acts like a DB850, hence the good „Aerochrome properties“....

No worries, all fun to do & learn

#16 Andrea B.

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Posted 24 April 2021 - 18:53

Very nice series, Col.
I really like these palm trees in alternate lights. They make for very cool photos.

And I also am happy to see filter tests like this. It is very informative for everyone.

I'm now wondering if I could get anything interesting like this using my local cholla cactus as a subject?
Hmmmm......it might be time to gear up and get outside again.
Andrea G. Blum
Often found hanging out with flowers & bees.

#17 colinbm

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Posted 26 April 2021 - 03:18

I found two more yellow filters, a Shott OG515 that cuts-on at 500nm & a Chinese CB535 that cuts-on at 525nm.

6/ Shott OG515 500nm+ with DB850 CWB swap to GBR

Attached Image: 6 Shott OG515 500nm+ with DB850 CWB swap to GBR.jpg


7/ CB535 525nm+ with DB850 CWB swap to GBR

Attached Image: 7 CB535 525nm+ with DB850 CWB swap to GBR.jpg

#18 colinbm

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Posted 28 April 2021 - 04:22

The original five has now stretched out to twelve yellow filters passing from 470nm to 570nm all with the DB850 & channel swapped to GBR.

Here is the latest addition of a Tiffen #12 filter, which passes from 510nm again with the DB850 & CWB in camera & channel swapped to GBR.

Attached Image: Y09 Tiffen Y12 510nm+ with DB850 CWB swap to GBR web.jpg