• Ultraviolet Photography
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Kraftwerk (no, not the band)

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#1 StephanN

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Posted 28 March 2021 - 11:35

Apologies for the topic title, couldn't resist; I wonder how many people still remember Kraftwerk, the band :smile:

I've been wanting to try out my Soligor tele-lens for some time, so I took it along today for my walk to the nearby power-station. It was in fine company, with the Soligor 21mm and the Steinheil Cassar-S 50mm.

My version of the Soligor 300mm f/5.5 does not look like the one here: https://www.ultravio...Bsoligor+%2B300 , it looks pretty similar to this one: https://www.ebay.com...FkAAOSwxWZgBe2m , with the aperture ring very close to the rear end, although mine came in a M42-mount. The front-filter size is 58mm. Image quality, at least in the centre, is pretty good, but towards the edges it dropps off quite drastically. In VIS it's a bit better towards the edges, but if I want VIS edge-to-edge high quality, I'll go for some modern Canon lens anyway. But, it's a decent lens if you're happy with centre sharpness, and on EBay it's also dead cheap.

The cameras were my usual ones
  • UV: Canon EOS 6D, b/w, internal X330C, external S8612
  • VIS. Canon EOS 5DSR
  • IR: Canon EOS 6D, converted to 700nm
Slight differences in the angles of view are due to the fact, that I took the UV photo from the tripod, but the other ones handheld.

The first two sets are just standard shots from either bank of the river, with settings as follows.

First set, Soligor 21mm f/3.8, at f/5.6, all ISO 100, UV 1s, VIS 1/640s, IR 1/250 s

Attached Image: 20210328-UV_0001.jpg
Attached Image: 20210328-VIS_0001.jpg
Attached Image: 20210328-IR700_0001.jpg

Second set, Steinheil Cassar-S 50mm f/2.8, at f/16, all ISO 100, UV 3.2s, VIS 1/200s, IR 1/60s

Attached Image: 20210328-UV_0011.jpg
Attached Image: 20210328-VIS_0006.jpg
Attached Image: 20210328-IR700_0006.jpg

Thrid set, that's the one for which I wanted to 300mm-lens, because it's mighty difficult to take a shot with this angle from the water :grin:.

Soligor 300mm f/5.5, at f/16, UV ISO 100, 8s, VIS ISO 1600, 1/640s, IR ISO 800, 1/500s, distance to target probably some 200m, they were taken from the same spot as the Cassar-set.

Attached Image: 20210328-UV_0009.jpg
Attached Image: 20210328-VIS_0005.jpg
Attached Image: 20210328-IR700_0005.jpg

Last set, to highlight the quality issue. The photo was taken at f/16, ISO 100 and 12s., from the same spot as the preceding series.
  • Full photo
  • Center crop 1000x1000
  • Left edge, center 1000x1000
  • Left lower corner 1000x1000

Attached Image: 20210328-UV_0008.jpg
Attached Image: 20210328-UV_0008-1.jpg
Attached Image: 20210328-UV_0008-2.jpg
Attached Image: 20210328-UV_0008-3.jpg

Edited by StephanN, 28 March 2021 - 11:43.

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#2 Bernard Foot

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Posted 28 March 2021 - 12:27

Hi, Stephan.

It's not clear to me in the very last shot how much the blurredness is due to lens quality and how much is due to focussing (because the trees are closer than the hydro plant). It would have ben interesting to reframe the image in each shot so that the same part of the subject appeared in each crop.
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#3 StephanN

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Posted 28 March 2021 - 12:52

View PostBernard Foot, on 28 March 2021 - 12:27, said:

Hi, Stephan.

It's not clear to me in the very last shot how much the blurredness is due to lens quality and how much is due to focussing (because the trees are closer than the hydro plant). It would have ben interesting to reframe the image in each shot so that the same part of the subject appeared in each crop.

You're quite right, I only thought about the comparison when I was already back home. The second one is better, because the building behind the trees is more or less in the same distance as the central part. Perhaps the lower right corner is better, because that also should be in the same distance, give and take a bit:

Attached Image: 20210328-UV_0008-4.jpg

Edited by StephanN, 28 March 2021 - 12:52.

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#4 dabateman

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Posted 28 March 2021 - 12:54

Oh I remember crapwork as we used to call them. I like some of their music.

This lens looks much better than expected and Enrico seems to think it's nearly the same transmission as a quartz lens outside. So I would expect some serious chromatic aberration, but thats not a problem in UV. Or maybe not a problem with this lens and if you get over its slow speed a possible UV telephoto winner.


#5 Bernard Foot

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Posted 28 March 2021 - 14:29

View Postdabateman, on 28 March 2021 - 12:54, said:

Oh I remember crapwork as we used to call them. I like some of their music.


"Paah-Paah-Paah auf der Autobahn" are the only lyrics I remember.

View Postdabateman, on 28 March 2021 - 12:54, said:


So I would expect some serious chromatic aberration, but thats not a problem in UV.


I would have thought it would be a problem. It won't manifest itself as colour fringeing, but it would cause a blurring/smudging.
Bernard Foot

#6 Bernard Foot

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Posted 28 March 2021 - 14:32

View PostStephanN, on 28 March 2021 - 12:52, said:


Perhaps the lower right corner is better, because that also should be in the same distance, give and take a bit:


Yes, you can really see the softness now compared with the centre crop.
Bernard Foot

#7 nfoto

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Posted 28 March 2021 - 17:19

I'm fond of Kraftwerk. Once attended a performance of TEE Trans Europe Express in Berlin.

#8 StephanN

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Posted 28 March 2021 - 17:31

For those who don't know:

https://www.youtube....h?v=iukUMRlaBBE

https://www.youtube....h?v=5DBc5NpyEoo

https://www.youtube....h?v=OQIYEPe6DWY

Modernized version:

https://www.youtube....h?v=dsrdN5nBvns
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#9 OlDoinyo

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Posted 28 March 2021 - 20:41

Your test subject contains very little UV chromaticity (judging by the Steinheil shot) which makes bandpass difficult to judge. In general, you can very much get CA in UV photos; I have seen it manifest both as radial blur and as actual colored fringing. There are other things that cause radial blur as well, so in the absence of color evidence it is hard to say.

#10 StephanN

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Posted 29 March 2021 - 16:57

View PostOlDoinyo, on 28 March 2021 - 20:41, said:

Your test subject contains very little UV chromaticity (judging by the Steinheil shot) which makes bandpass difficult to judge. In general, you can very much get CA in UV photos; I have seen it manifest both as radial blur and as actual colored fringing. There are other things that cause radial blur as well, so in the absence of color evidence it is hard to say.

It is pretty well hidden in the initial post, but my UV-shots were taken with a black/white camera, so probably that's the reason for the lack of colour, or am I missing something here? :smile:
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#11 dabateman

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Posted 29 March 2021 - 17:07

Kraftwerk in visible with Canon 40mm F2.8 lens:
Attached Image: Visible_Kraftwerk.jpg

Kraftwerk illuminated with Nemo UV light with Canon 40mm F2.8 lens:
Attached Image: UV_Kraftwerk.jpg

This was the first record I saw. Works with illumination at road point. I might have others.