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Soligor Miranda, Kowa Prominar 5cm f1.9 Questions
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PostPosted: Fri Jul 26, 2019 7:28 am    Post subject: Soligor Miranda, Kowa Prominar 5cm f1.9 Questions Reply with quote

The Soligor Miranda and Kowa Prominar 5cm f1.9 lenses appear identical.
I have the Soligor Miranda 5cm f1.9 - serial Number KXXXXXXX which I believe is a re-badged Kowa Prominar.
Does anyone know the lens construction of these lenses.
For what it's worth, it appears from the reflections that the lens has six elements.
I am interested to know if it is another Biotar type.
It certainly can show similar swirl in its bokeh

Here are some images of the lens, followed by samples taken with it
Tom


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PostPosted: Fri Jul 26, 2019 9:17 am    Post subject: Reply with quote

I can't really answer your specific questions, although I do have 2 copies of the lens. The first I bought because of a general curiosity with Kowa lenses, the second I got for $5 and couldn't resist a bargain, although it does need disassembly as the aperture does not work. So perhaps I will be able to help with that when I get to that job.

First impressions of the one I did try a couple of test shots, and was pleasantly surpised by an exceptionally sharp corner to corner image at F8 focussed in the distance, which is my general rough test for my particular usage.

I also have two copies of the 135/3.5 of the same lens range, and likewise, one was to try and the second was $6, bought at the same time as the cheap 50/1.9. But needing extensive cleaning for fungus. The IQ of the lens is good but not outstanding. As per most older telephotos you can have higher edge resolution with a side helping of fringing, or slightly reduced edge resolution with none. This lens goes with the second option, and does it fairly well for this era.

And I only just received the 28/2.8 for the same range which is not seen very often, and likewise needing a clean of one interior element. No tests done yet.


PostPosted: Fri Jul 26, 2019 11:24 am    Post subject: Reply with quote

Tom, it is 6 elements in 4 groups. MFD is 17", the objective is hard coated.
Lens is made from rare earth high refractive glass.


PostPosted: Fri Jul 26, 2019 2:35 pm    Post subject: Reply with quote

In the Butkus.org page, see the Kowa SE manual.

The lens is a kowa 1,9/50.

The same lens than the soligor miranda K 1,9/50?

IT's 6/4 lens


PostPosted: Sat Jul 27, 2019 9:53 am    Post subject: Reply with quote

Thanks everyone for the feedback.
I was interested to know if the lens is a Biotar type design or a double gauss and if anyone knew for sure.
Both are 6 elements in four groups.
It does swirl like a Biotar, hence my question.
Tom


PostPosted: Sun Jul 28, 2019 7:25 pm    Post subject: Reply with quote

Oldhand wrote:
Thanks everyone for the feedback.
I was interested to know if the lens is a Biotar type design or a double gauss and if anyone knew for sure.
Both are 6 elements in four groups.
It does swirl like a Biotar, hence my question.
Tom


As you know, the Biotar is a doble Gauss lens, like the Planar.

If you want yo know if the Kowa has the Biotar rendering, ....i donut know


PostPosted: Mon Jul 29, 2019 7:40 am    Post subject: Reply with quote

I cleaned my one today. The front and rear elements remove very easily, each as an assembly. I disassembled the forward assembly, it is similar to the biotar scheme with a single element followed by a cemented doublet. Unfortunately I could not completely disassemble the rear assembly, it was too tight. The rear element is a single, I managed to remove that part, but could not remove the other two.

I gave the lens a small tryout in my back yard but did not notice much in the way of swirl, your results may vary.

edit: after looking at a biotar diagram, the Soligor Miranda 5cm/1.9 doesn't seem to be as symmetrical, I'm not sure if that is significant.


PostPosted: Mon Jul 29, 2019 9:57 am    Post subject: Reply with quote

Thank you papasito and Alun.
I had in my mind that the Biotar was not a double gauss for some reason.
I will take some more images with the Miranda to see if I can re-produce the swirl.
It certainly looks like it in some of my shots
T