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Meyer-Optik Görlitz 35mm f/4.5 Primagon

UV Lens
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#1 Andrea B.

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Posted 11 September 2016 - 18:53

Meyer-Optik Görlitz 35mm f/4.5 Primagon
Blades: 10
Elements: 4/4
FFD: 45.46mm
Filter: 49mm
Mount: M42x1

Attached Image: primagon35_20160829wf_49655.jpg

Attached Image: primagon35_20160829wf_49651.jpg

Attached Image: primagon35_20160829wf_49659.jpg
Andrea G. Blum
Often found hanging out with flowers & bees.

#2 Kevin Bannister

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Posted 10 August 2020 - 07:30

View PostAndrea B., on 11 September 2016 - 18:53, said:

Meyer-Optik Görlitz 35mm f/4.5 Primagon
Blades: 10
Elements: 4/4
FFD: 45.46mm
Filter: 49mm
Mount: M42x1

Attachment primagon35_20160829wf_49655.jpg

Attachment primagon35_20160829wf_49651.jpg

Attachment primagon35_20160829wf_49659.jpg

Hi Birna, I am working on adapter for this lens. Is the UV transmittance good?

#3 UlfW

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Posted 10 August 2020 - 14:04

The UV transmittance is not very good, but still usable, indicated to 345nm here:
https://www.fotozone.../&hl=comprising
You might have to register to see this list.

Observe that the noted cutoff wavelengths are for -3 stops!
In reality the usable UV-ranges normally are some 15-20nm closer to the visual range, beginning at 400nm

Edited by UlfW, 10 August 2020 - 14:07.

Ulf Wilhelmson
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#4 Andrea B.

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Posted 12 August 2020 - 23:41

Ulf, I could not access that link. Seems to be restricted to Fotozone members?

**********

Kevin --
Here is a test photo of my 5 Spectralon standards along with some flowers having typical UV-signatures. You can see that the Meyer-Optik Görlitz 35/4.5 is UV-capable. The flowers were in a rather sorry state from the heat, but that does not affect the capture of their UV-absorption and UV-reflectivity.
http://www.ultraviol...primagon-for-uv

I was using a BaaderU UV-pass filter which peaks around 350 nm. So this particular copy of the Meyer-Optik seems to be good enough. I wouldn't call it "not very good".

Do note, however, that there are sometimes slightly different versions of these old lenses. If the one you have looks like the photos above, then you can expect results as shown.

.
Andrea G. Blum
Often found hanging out with flowers & bees.

#5 UlfW

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Posted 13 August 2020 - 03:17

I have an old membership there.

I originally found the link in the lens sticky for KDS.
It is to the page where Klaus is comparing many old lenses's showing the -3Stop point he found with a horizontal bar-graph.
I have downloaded the image, but do not know if it is OK to share due to copyright rules.
Ulf Wilhelmson
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#6 Andy Perrin

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Posted 13 August 2020 - 05:47

Ulf, I know the one you mean, and if I'm not mistaken, all the info from that list was included in our lens sticky. So we have the information already even if not the graph.

#7 UlfW

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Posted 13 August 2020 - 11:50

View PostAndy Perrin, on 13 August 2020 - 05:47, said:

Ulf, I know the one you mean, and if I'm not mistaken, all the info from that list was included in our lens sticky. So we have the information already even if not the graph.
Except that in the sticky there is not mentioned the very strangely defined decision level of attenuation to 12.5% of max transmission. (-3 stop)
This gives very nice and low transition wavelength values that say little about how useful a lens is for common UV-photography as it do not take into account the slope of the transmission decay.

A much better way to describe lenses would be to define the -1 stop point and transmission at 365nm.
Ulf Wilhelmson
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#8 Andy Perrin

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Posted 13 August 2020 - 15:04

Heh. Maybe Andrea should update the sticky to put a note about that.