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Author Topic: Is that a crappy lens?  (Read 10798 times)

Airy

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Re: Is that a crappy lens?
« Reply #15 on: August 02, 2015, 22:38:53 »
Huh ? that was unexpected. Well, I have had an old, and rather small, 15mm Zeiss lens (F-mount, f/3.5 or f/4) in hands that could not even get sharp at any aperture, maybe a faulty copy. This one was even less expected.
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Airy Magnien

Dr Klaus Schmitt

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Re: Is that a crappy lens?
« Reply #16 on: August 02, 2015, 23:01:13 »
Quote from: Airy on August 02, 2015, 22:38:53
Huh ? that was unexpected. Well, I have had an old, and rather small, 15mm Zeiss lens (F-mount, f/3.5 or f/4) in hands that could not even get sharp at any aperture, maybe a faulty copy. This one was even less expected.

Well, what shall I say, comversion is not always straight forward and sometimes needs s lot of thinking and dinkering around ;-)
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Frank Fremerey

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Re: Is that a crappy lens?
« Reply #17 on: August 03, 2015, 00:31:26 »
OK. You posted a few very intriguing photos taken with a mystery lens. So what is the point?

Who in the first place said that the lens is crappy?

And: Who does  not know that a good photographer can take a good photo with any lens?
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Akira

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Re: Is that a crappy lens?
« Reply #18 on: August 03, 2015, 02:25:00 »
The flower shots are rather pretty.  The rainbow-colored bokeh fringe of the toad shot looks peculiar.

Is it only color corrected for UV?  Apparently the lens has no aperture.
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Akira

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Re: Is that a crappy lens?
« Reply #19 on: August 03, 2015, 02:29:38 »
Quote from: Airy on August 02, 2015, 22:38:53
Huh ? that was unexpected. Well, I have had an old, and rather small, 15mm Zeiss lens (F-mount, f/3.5 or f/4) in hands that could not even get sharp at any aperture, maybe a faulty copy. This one was even less expected.

If the 15mm is "small" and not like the Distagon 15mm for Yashica/Contax, it should be a rangefinder camera lens.  Then it wouldn't focus properly when mounted on a Nikon (D)SLR.  Maybe the focal point is "in" the lens.  You would have had to reverse-mount the lens for larger-than-life size shooting.
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Dr Klaus Schmitt

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Re: Is that a crappy lens?
« Reply #20 on: August 03, 2015, 07:29:13 »
Quote from: Akira on August 03, 2015, 02:25:00
The flower shots are rather pretty.  The rainbow-colored bokeh fringe of the toad shot looks peculiar.

Is it only color corrected for UV?  Apparently the lens has no aperture.

Well, the frog shot was mentioned to be stopped down, so it must have one and it does; to f11 actually.
And yes, it is color corrected UV-VIS.
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Dr Klaus Schmitt

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Re: Is that a crappy lens?
« Reply #21 on: August 03, 2015, 07:30:10 »
Quote from: Frank Fremerey on August 03, 2015, 00:31:26
OK. You posted a few very intriguing photos taken with a mystery lens. So what is the point?

Who in the first place said that the lens is crappy?

And: Who does  not know that a good photographer can take a good photo with any lens?

Just bragging of course ;-) And I'm quite convinced you know what a "rhetorical question" is...  ;)
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Dr Klaus Schmitt

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Re: Is that a crappy lens?
« Reply #22 on: August 03, 2015, 07:33:50 »
A stopped down shot (f8), here science related... European Starling VIS (left) and UV (right) showing intense UV patterns of the full ornate male plumage. Focus difference: None

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Airy

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Re: Is that a crappy lens?
« Reply #23 on: August 03, 2015, 08:57:08 »
I guess it is corrected for UV, not the visible range.
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Frank Fremerey

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Re: Is that a crappy lens?
« Reply #24 on: August 03, 2015, 09:01:33 »
As I do not know your style I did not see the irony.

Is that a Microscope lens or a stepper lens?

What was the original intent and mount?
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bobfriedman

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Re: Is that a crappy lens?
« Reply #25 on: August 03, 2015, 12:54:44 »
klaus-- could we see a better shot of the lens so we can read the lettering?
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Dr Klaus Schmitt

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Re: Is that a crappy lens?
« Reply #26 on: August 03, 2015, 14:17:19 »
Quote from: Airy on August 03, 2015, 08:57:08
I guess it is corrected for UV, not the visible range.

I mentioned that already above: "And yes, it is color corrected UV-VIS. "

Quote from: bobfriedman on August 03, 2015, 12:54:44
klaus-- could we see a better shot of the lens so we can read the lettering?

It is all there Bob, nothing more (except the supressed serial number, as my lens pictures gets stolen for auctions at times)
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bobfriedman

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Re: Is that a crappy lens?
« Reply #27 on: August 03, 2015, 14:54:52 »
maybe its me.. but i can't see the FL=? also UV-PL  ?

i don't need the serial number.. just intellectual curiousity
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Frank Fremerey

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Re: Is that a crappy lens?
« Reply #28 on: August 03, 2015, 16:24:58 »
Planar = Pl

Focal Length is 62mm
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You are out there. You and your camera. You can shoot or not shoot as you please. Discover the world, Your world. Show it to us. Or we might never see it.

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Dr Klaus Schmitt

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Re: Is that a crappy lens?
« Reply #29 on: August 03, 2015, 17:31:54 »
Quote from: bobfriedman on August 03, 2015, 14:54:52
maybe its me.. but i can't see the FL=? also UV-PL  ?

i don't need the serial number.. just intellectual curiousity

For a certain time when Zeiss West was in legal battle with Zeiss East (Jena), they were not allowed to use the product names.
OPTON = ZEISS (West); UV-PL = UV-Planar; focal length f=62mm

That lens was made based on NASA requirements for extraterrestrial use (= space use), so it is an "extraterrestrial lens"  :)
It was intended to be used on Graflex and Hasselblad camera bodies. Mine is a prototype with a 67mm screw mount.
It has 11 lens elements in 11 groups (11e/11g), made purely out of synthetric CaF2 (calcium fluoride) and quartz (fused silica)
without glued elemnts to allow for flat transmission down to 200nm. So far I could find out about it until today...

Hope that satisfies your curiousity  - and also yours Frank  ;) ;) ;)

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