My guess was that it was a Meritar, a somewhat common cheap 50mm f/2.9 on
Praktica and maybe Exakta cameras in the 1960s. A Cooke triplet as I recall.
Piers
On 3 December 2014 10:35:57 GMT+00:00, Hughes <timhughes@xxxxxxxx> wrote:
>
>
>Moose asked whether I had made an error in describing the tessar lens I
>had owned as a young teenager, as being F2.9.
>
>So Mike, interesting, you should mention the Meyor-Optic
>trioplan,because the 50mm,F2.9 I owned, may have been a Meyer optic
>trioplan lens, rather than the F2.8 Zeiss Jena Tessar lens also
>offered for the camera I owned.
>
>I am still not sure,looking at the Altix 5 camera pictured on the web,
>it has a silver Zeiss Tessar, which looks exactly like the lens/camera
>combination I owned, but I remember F2.9 because it was an odd
>aperture.
>
>
>Looking around on web, it seems the trioplans are valued for Digi
>camera conversions, as they have very distinctive sharp completely
>round edge bokeh,("bubble Bokeh") because of large number of blade
>diaphragms and location of diaphragm etc. Ebay prices are quite high
>$150-200.
>
>Check this distinctive bokeh from the 100/F2.8 trioplan:
>
>http://forum.mflenses.com/viewtopic,p,1314247.html
>https://www.flickr.com/groups/1015178@N21/pool/page2
>
>
>I still have a Meyer-Optic 90mm F3.5 lens somewhere, I had bought at
>the same time for that old Altix 5 camera.
>
>It is tiny lens which I adapted to OM mount, years later, although I
>never used it much on OM.
>I should look it out and see what the bokeh is like. It is a 4 element
>design though and has a large number of aperture blades.
>This website shows they go for about $250 on ebay. Not sure what mine
>would go for having been modified to an OM Mount.
>
>http://allphotolenses.com/lenses/item/c_1951.html
>
>
>Talk about simple minimalist lens design, the Trioplan has it over the
>Tessar, but I am sure the Tessar is a lot sharper.
>
>
>Tim
>
>
>
>________________________________
> From: Mike Gordon via olympus <olympus@xxxxxxxxxxxxxxxxx>
>To: olympus@xxxxxxxxxxxxxxxxx
>Sent: Tuesday, December 2, 2014 4:25 PM
>Subject: [OM] Simple lens designs like Tessar on Digital cameras.
>
>
>>>Over the years there have been lots of small cameras still using the
>venerable
>>>>Tessar design.
>
>Agreed. There are only so many ways to efficiently slay the aberration
>jaberwockies. Here is a history of the Tessar patented by Zeiss:
>
>www.zeiss.com/content/dam/.../cln39_en_web_special_tessar.pdf
>
>
>I always thought given its design it was just developed by modifying
>the Cooke triplet (1890's?) in which one of the exterior positive
>elements has been replaced by a cemented group to create the Tessar,
>but its origin was different. Again efficient design leads to similar
>solutions. The Heliar does seem to have been an offshoot of the
>triplet.
>
>Using modern glass variations the degrees of freedom available has
>increased dramatically and superb simple lenses are possible. I think
>Andrew has an expensive elegant Cooke triplet of recent design. Where
>is our venerable list curmudgeon anyway?--he should be back by now.
>
>One Cooke triplet I still like is the Meyer-Optik Görlitz Trioplan 100
>mm f/ 2.8 Lens in M42 mount. I did try and snipe a few but the price
>has gone way way up the past few years. It just has a wonderful
>rendering and very nice bokeh. (IIRC the version with red V on it has
>the best coatings)
>
>3 or 4 can be plenty, Mike
>--
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