Help with Antique Apertures

[Nev]

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]

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]

And its these that sometimes will give off a vignette or blur?

See post #13 above.

[Anastigmatic]

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]

The five element 2,8 Xenar was available in 5 and 7,5 cm a few years before the war.

[Anastigmatic]

there was also a later 80mm version