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Nev
03-12-2009, 05:44 PM
A triplet is a lens consisting of 3 separate lens cells or elements. Very often they'll have names with tri in them such as Triotar.
And its these that sometimes will give off a vignette or blur?

Anastigmatic
03-12-2009, 06:25 PM
Is the last "Xenar" a typo for "Xenotar"? (Xenars were Schneider's Tessar clones, Xenotars their 5-element lenses comparable to the Zeiss Planar or Voigtlaender Heliar.)



-NT

nah, actually its not a typo, NT, its only the f2.8 Xenar (not the others) found on folders mostly pre-war that are 5 element lenses with 3 air spaces (its not the same lens as a Xenotar though), its much like a tessar but you can imagine the front element of the tessar divided into two, with an air space between them. Scheider within the factory called them Xenar-S but it is not written on the lens or in their advertising literature, although their old lens booklets do detail the layout but dont mention the 'S' (so 2-1-1-1 configuration)

nemo999
03-12-2009, 06:27 PM
And its these that sometimes will give off a vignette or blur?

See post #13 above.

Anastigmatic
03-12-2009, 06:35 PM
and while i am thowing out unknown 5 element lenses, here another one not often known, some of the Color Solinar are 5 element as well (not the old uncoated ones), they have an extra tiny element cemented in the center (so 2-2-1)

JPD
03-18-2009, 02:16 AM
The five element 2,8 Xenar was available in 5 and 7,5 cm a few years before the war.

Anastigmatic
03-18-2009, 04:51 PM
there was also a later 80mm version