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Pancolart
Joined: 04 Feb 2008
Posts: 3705
Location: Slovenia, EU
Expire: 2013-11-18
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 Posted: Fri Oct 27, 2023 8:46 am Post subject: Cosina 3.5-4.5/28-50mm 12 elements design |
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Pancolart wrote:
Cemented on 4 places. Did a complete CLA. Test to follow. Sorry for crappy drawing.
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D1N0
Joined: 07 Aug 2012
Posts: 2535
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| Posted: Fri Oct 27, 2023 10:42 am Post subject: |
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D1N0 wrote:
looks decentered 
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Ultrapix
Joined: 06 Jan 2012
Posts: 569
Location: Italy
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| Posted: Fri Oct 27, 2023 11:46 am Post subject: |
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Ultrapix wrote:
| D1N0 wrote: |
| looks decentered |
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eggplant
Joined: 27 May 2020
Posts: 517
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| Posted: Fri Oct 27, 2023 1:46 pm Post subject: |
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eggplant wrote:
I see what structure that's intending to be, up to all the details.
My memory here is going, and I will have to consult the forums on who Cosina made lenses for and how to identify them (here of this era). Particularly for the style of lens below, which I assume is the one as a Cosinon-Z.
(Photos taken from eBay listing):
I have seen Miranda (Dixons in UK photographic brand) lenses be Cosina ones around early 1980s (when they acquired the branding?).
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D1N0
Joined: 07 Aug 2012
Posts: 2535
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| Posted: Fri Oct 27, 2023 1:58 pm Post subject: |
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D1N0 wrote:
When I did research for my 28-50mm topic I found the Cosina in Petri, Hoya, Cosinon and Vivitar
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alex_d
Joined: 19 Jan 2019
Posts: 419
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| Posted: Fri Oct 27, 2023 4:46 pm Post subject: |
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alex_d wrote:
| D1N0 wrote: |
| looks decentered |
but it has great 3d pop & bucket !
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Pancolart
Joined: 04 Feb 2008
Posts: 3705
Location: Slovenia, EU
Expire: 2013-11-18
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| Posted: Fri Oct 27, 2023 5:58 pm Post subject: |
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Pancolart wrote:
| alex_d wrote: |
| D1N0 wrote: |
| looks decentered |
but it has great 3d pop & bucket !
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LOL i see it made an impact.
Yes, Eggplant it is the same as on your photos Cosinon-Z.
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alex_d
Joined: 19 Jan 2019
Posts: 419
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| Posted: Fri Oct 27, 2023 6:33 pm Post subject: |
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alex_d wrote:
well something is strange to me here, i have somewhere a small cosinon zoom branded as petri
it does look a bit different. its i think late '70 or early '80 lens
[small]lousy bucket ...[/small] |
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stevemark
Joined: 29 Apr 2011
Posts: 4015
Location: Switzerland
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| Posted: Fri Oct 27, 2023 7:51 pm Post subject: Re: Cosina 3.5-4.5/28-50mm 12 elements design |
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stevemark wrote:
| Pancolart wrote: |
| Cemented on 4 places. Did a complete CLA. |
Awesome!
| Pancolart wrote: |
| Sorry for crappy drawing. |
[/quote]
Uh-oh ... not so awesome
Anyway, seems like a pretty complicated design (Mamiya ZE 3.5-4.5/28-50mm has only 9 lenses and certainly isn't worse)!
S
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