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11-30-2008, 11:02 AM   #1
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strange circular light bokeh?

a lot ot time ago i saw a particular photo:
lights in bokeh were "circular".
very strange but nice.

i remeber only that it was a m42 lens.

can help me to find this lens?

11-30-2008, 11:32 AM   #2
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You mean something like this:

https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/42795-my-jupit...herman999.html

Any lens with a larger number of curved aperture blades will show a circular pattern for specular highlights. In the above case, it was the Jupiter-9.

Steve
11-30-2008, 11:36 AM   #3
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hello stevebrot,

i know very well Jupiter-9.

it was another lens.

and the circular lights in bokeh were very very very strange!

i don't remember the name...
11-30-2008, 11:42 AM   #4
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Maybe a mirror lens which produces donut highlights? This was a Sigma 600.
Attachment 23208


Last edited by SpecialK; 06-29-2016 at 09:34 PM.
11-30-2008, 01:41 PM   #5
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QuoteOriginally posted by SpecialK Quote
Maybe a mirror lens which produces donut highlights? This was a Sigma 600.
Attachment 23208
it is a little similar, but it was not a mirror lens
11-30-2008, 07:48 PM   #6
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the 3rd photo in this link? :: https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/39840-cosina-5...tml#post400391 ?
11-30-2008, 10:45 PM   #7
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Hi! Maybe this is what you're looking for
https://www.pentaxforums.com/forums/314202-post57.html
..and it comes from Helios-40.
11-30-2008, 11:00 PM   #8
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For the OP...Can you remember any details of any example pictures that were posted? I think I remember something similar to what you describe, but am not sure that I saw it posted here.

Steve

12-01-2008, 01:56 AM   #9
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i remeber only that it was a m42 lens. i'm sure.
i saw a photo not in this forum, but in the web.

it is not Helios-40 and it is not Cosina 55mm f1.2.

lights in bokeh were circular: nice and perfect circumferences!
and the circumference's perimeter (=border line of circumference area) was +brillant than the center area.
12-01-2008, 09:34 AM   #10
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I recall a lovely photo of blue (red?) lights in the OF area that did that. I can't find it.
12-01-2008, 12:04 PM   #11
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QuoteOriginally posted by m8o Quote
I recall a lovely photo of blue (red?) lights in the OF area that did that. I can't find it.
That is what I remember as well and I also could not find it.
12-01-2008, 12:52 PM   #12
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I used Pentax A 50mm f/1.7 with Pentax F-1.7x AF TC and I shoot this as a 85mm f/2.8 in the combination and I do see some circular bokehs. You may not like the sharp edge bokeh as compared to others that are softer. But I don't mind this as I like things that are different and unique and I prefer for sharpness on a lens over the soft bokeh and hence I like both of my 50mm with FA and A for different purposes


Last edited by hinman; 12-01-2008 at 03:18 PM.
12-01-2008, 01:03 PM   #13
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hahaha! yes! thanx hinman, having just used my newly acquired 50/1.4-A w/the 1.7x TC yesterday, it should have occurred to me. Well, that's what I remembered. But it's not an M42 lens so likely not the same for you platinum.
12-01-2008, 01:43 PM   #14
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This is from the jupiter 9 post, but thePiRaTE!! has a photo from a Meyer-Gorlitz Trioplan, which is an M42 lens.

https://www.pentaxforums.com/forums/405822-post24.html

There's also a Takumar 58/2.4 shot which might be it:
https://www.pentaxforums.com/forums/247575-post13.html

Was it on this forum?
12-01-2008, 02:26 PM - 1 Like   #15
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there are lots of lens that have circular bokeh. Sometime, it appears to depend on the light sources too.

If you are specific on the M42 lens, I recommend the Vivitar 28mm f/2.5 from Kiron. Though it may not be the best in old 28mm lens, it is easy to find both in K mount and M42 mount for about $20 to $50 in price range.

The lens has 67mm filter size and it requires a good lens hood to guard against flare. These few shots are done with circular rings in the K version, I assume similar bokeh and number of blades, design, optics in the M42 older version


Vivitar 28mm f/2.5 from Kiron



subtle but you can see the circular rings


Vivitar 28mm f/2.5 from Kiron

In general, I would recommend K lens over M42 with exceptions on finding a lens for cheaper cost or something that is unique in the M42 lens collection and not found in K mount. The Jupiter9, many Russian lens, Carl Zeiss are among the exceptions in my list. But like the Kiron and Komine lens, if I find the K mount with a reasonable price, I always opt for the K version for few obvious reasons:
  • No need for M42 adapter
  • Easier to sell or trade for later upgrade
  • Newer lens with less wear, marks, scratches, fungus and others
  • Higher retained resale value
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