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55
Joined: 13 May 2013
Posts: 718
Location: U.S.
Expire: 2022-06-15
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 Posted: Thu Mar 31, 2022 12:08 am Post subject: Rexatar and Rexagon lenses (in Prinz brochure) |
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55 wrote:
Circa mid 1970s?
The branding here is curious. In the 1960s, American Camera and Photo Supply Co. began selling photo products under the Prinz brand name. Subsequently, it appears some Prinz lenses were sub-branded as Rexatar and Rexagon.
My own Rexagon 135mm lens was made in Japan and I would assume all the lenses listed here were made in Japan as well. But I have no information about the manufacturer.
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eggplant
Joined: 27 May 2020
Posts: 517
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| Posted: Wed Apr 06, 2022 1:15 pm Post subject: |
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eggplant wrote:
Very nice to know this exists- I had been looking for brochures like this, which have diagrams, but all mostly in America hidden behind expensive shipping...
Thanks for the upload. |
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RokkorDoctor
Joined: 27 Nov 2021
Posts: 1438
Location: Kent, UK
Expire: 2025-05-01
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| Posted: Wed Apr 06, 2022 2:30 pm Post subject: |
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RokkorDoctor wrote:
What is the significance of the shaded lens elements in the diagrams?
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Mark
SONY A7S, A7RII + dust-sealed modded Novoflex/Fotodiox/Rayqual MD-NEX adapters
Minolta SR-1, SRT-101/303, XD7/XD11, XGM, X700
Bronica SQAi
Ricoh GX100
Minolta majority of all Rokkor SR/AR/MC/MD models made
Sigma 14mm/3.5 for SR mount
Tamron SP 60B 300mm/2.8 (Adaptall)
Samyang T-S 24mm/3.5 (Nikon mount, DIY converted to SR mount)
Schneider-Kreuznach PC-Super-Angulon 28mm/2.8 (SR mount)
Bronica PS 35/40/50/65/80/110/135/150/180/200/250mm |
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55
Joined: 13 May 2013
Posts: 718
Location: U.S.
Expire: 2022-06-15
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| Posted: Wed Apr 06, 2022 10:56 pm Post subject: |
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55 wrote:
| eggplant wrote: |
Very nice to know this exists- I had been looking for brochures like this, which have diagrams, but all mostly in America hidden behind expensive shipping...
Thanks for the upload. |
You're welcome.
Yes, I really enjoy finding brochures for third party lenses. And this one was a pleasant surprise:
Full specs and it's even printed on nice, textured paper.
| RokkorDoctor wrote: |
| What is the significance of the shaded lens elements in the diagrams? |
That's a good question. At first glance, it would appear that cemented groups are shaded. But that doesn't seem to apply in all cases.
Maybe there are mistakes? Or maybe the shading is just marketing razzle dazzle? 
I can confirm my copy of the Rexagon 100mm does have a cemented triplet. Alas, that triplet also has some separation.
And I know the Rexagon 135mm which came along with the brochure also has cemented elements... because it too has separation!
The brochure is better made than the lenses!  |
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RokkorDoctor
Joined: 27 Nov 2021
Posts: 1438
Location: Kent, UK
Expire: 2025-05-01
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| Posted: Thu Apr 07, 2022 9:10 am Post subject: |
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RokkorDoctor wrote:
| 55 wrote: |
| eggplant wrote: |
Very nice to know this exists- I had been looking for brochures like this, which have diagrams, but all mostly in America hidden behind expensive shipping...
Thanks for the upload. |
You're welcome.
Yes, I really enjoy finding brochures for third party lenses. And this one was a pleasant surprise:
Full specs and it's even printed on nice, textured paper.
| RokkorDoctor wrote: |
| What is the significance of the shaded lens elements in the diagrams? |
That's a good question. At first glance, it would appear that cemented groups are shaded. But that doesn't seem to apply in all cases.
Maybe there are mistakes? Or maybe the shading is just marketing razzle dazzle?
I can confirm my copy of the Rexagon 100mm does have a cemented triplet. Alas, that triplet also has some separation.
And I know the Rexagon 135mm which came along with the brochure also has cemented elements... because it too has separation!
The brochure is better made than the lenses! |
I first thought cemented lenses as well, but as you say, that is not the case for one of these designs.
My best guess would be that they indicate what were at the time considered to be low dispersion glass elements.
_________________
Mark
SONY A7S, A7RII + dust-sealed modded Novoflex/Fotodiox/Rayqual MD-NEX adapters
Minolta SR-1, SRT-101/303, XD7/XD11, XGM, X700
Bronica SQAi
Ricoh GX100
Minolta majority of all Rokkor SR/AR/MC/MD models made
Sigma 14mm/3.5 for SR mount
Tamron SP 60B 300mm/2.8 (Adaptall)
Samyang T-S 24mm/3.5 (Nikon mount, DIY converted to SR mount)
Schneider-Kreuznach PC-Super-Angulon 28mm/2.8 (SR mount)
Bronica PS 35/40/50/65/80/110/135/150/180/200/250mm |
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philslizzy
Joined: 07 Aug 2012
Posts: 4745
Location: Cheshire, England
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| Posted: Thu Apr 07, 2022 7:04 pm Post subject: |
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philslizzy wrote:
there appear to be two Prinz brands, one was used by Dixons in UK. But their lenses wew simply branded Prinz, no name. Looking at them they probably came from the same budget maker
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55
Joined: 13 May 2013
Posts: 718
Location: U.S.
Expire: 2022-06-15
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| Posted: Tue Apr 12, 2022 5:51 pm Post subject: |
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55 wrote:
| RokkorDoctor wrote: |
. . .
My best guess would be that they indicate what were at the time considered to be low dispersion glass elements. |
Interesting. I usually associate "exotic" glass with first party manufacturers. But I'm not knowledgeable.
| philslizzy wrote: |
| there appear to be two Prinz brands, one was used by Dixons in UK. But their lenses wew simply branded Prinz, no name. Looking at them they probably came from the same budget maker |
Yes, it would be intriguing to know for certain if there was an association between the two. |
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calvin83
Joined: 12 Apr 2009
Posts: 7588
Location: Hong Kong
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| Posted: Tue Apr 12, 2022 8:03 pm Post subject: |
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calvin83 wrote:
| RokkorDoctor wrote: |
| that is not the case for one of these designs. |
That one may be just an mistake. I think it indicates cemented lenses too.
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Tefolium
Joined: 26 Mar 2021
Posts: 11
Location: japan
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| Posted: Fri Aug 23, 2024 6:05 am Post subject: |
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Tefolium wrote:
I have a Rexagon 28mm 1:2.8, BUT it is Exa mount. |
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