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Cassar, Cassarit, Cassaron
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PostPosted: Sat Aug 08, 2009 11:24 pm    Post subject: Cassar, Cassarit, Cassaron Reply with quote
I know (or I think I know) that the Steinheil Cassar is a triplet.
Anyone know about the designs of the Cassarit and Cassaron lenses?


PostPosted: Sun Aug 09, 2009 1:42 pm    Post subject: Steinheil lenses Reply with quote
"Cassar, Cassarit, Cassaron ..." reminds me of learning latin at school all those years ago "amo, amas, amat..." - !

I always thought the Cassars were triplets, the Cassarits were 4-glass triplets, and the Cassarons were either symmetricals or Sonnar-types. But I've just looked in my copy of Cox's "Optics" and he says the Cassars were FIVE element triplet derivatives and the Cassaron the simple 3-glass types. I think for once in his life he might be wrong there. Time for more learned MF Lens members to add to the font of human knowledge - !


PostPosted: Sun Aug 09, 2009 4:04 pm    Post subject: Re: Steinheil lenses Reply with quote
scsambrook wrote:
"Cassar, Cassarit, Cassaron ..." reminds me of learning latin at school all those years ago "amo, amas, amat..." - !

I always thought the Cassars were triplets, the Cassarits were 4-glass triplets, and the Cassarons were either symmetricals or Sonnar-types. But I've just looked in my copy of Cox's "Optics" and he says the Cassars were FIVE element triplet derivatives and the Cassaron the simple 3-glass types. I think for once in his life he might be wrong there. Time for more learned MF Lens members to add to the font of human knowledge - !


Stephen,

That is not necessarily true: it's a common practise for lens manufacturers to re-use lens names for different constructions, even for Zeiss, the Sonnar was originally a Contessa-Nettel name, then recycled for those for the Contax; the Biogon was an assymetrical lens for the Contax and then the name was reused for a large-format wide-angle lens.


PostPosted: Sun Aug 09, 2009 5:02 pm    Post subject: Re: Steinheil lenses Reply with quote
Seele wrote:

Stephen,

That is not necessarily true: it's a common practise for lens manufacturers to re-use lens names for different constructions, even for Zeiss, the Sonnar was originally a Contessa-Nettel name, then recycled for those for the Contax; the Biogon was an assymetrical lens for the Contax and then the name was reused for a large-format wide-angle lens.


Ah! A good point - and it restores my faith in Arthur Cox !


PostPosted: Mon Aug 10, 2009 5:13 pm    Post subject: Re: Steinheil lenses Reply with quote
scsambrook wrote:
"Cassar, Cassarit, Cassaron ..." reminds me of learning latin at school all those years ago "amo, amas, amat..." - !

I always thought the Cassars were triplets, the Cassarits were 4-glass triplets, and the Cassarons were either symmetricals or Sonnar-types. But I've just looked in my copy of Cox's "Optics" and he says the Cassars were FIVE element triplet derivatives and the Cassaron the simple 3-glass types. I think for once in his life he might be wrong there. Time for more learned MF Lens members to add to the font of human knowledge - !


Thanks for the info.

Question:
When you say 4-glass triplet, do you mean a cemented pair plus 2 additional
air-spaced elements?


PostPosted: Thu Oct 09, 2014 8:38 am    Post subject: Reply with quote
Just for teh record: http://camera-wiki.org/wiki/Steinheil

It is a triplet lens


PostPosted: Thu Oct 09, 2014 3:23 pm    Post subject: Reply with quote
I think I remember reading somewhere that the Cassarit name was invented when the Cassar was recalculated (to be "color corrected"). Apparently the Cassar had a poor reputation in its own time, and the Cassarit was supposed to be much improved.

The Auto-Cassaron seems to be a different design again (but also a triplet) the one I had could not outperform a Domiplan, although it looked very pretty!

So while they are all triplets, they are not all the same design.
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