This lens is a second version of troitars barrel TR135_2. Come with s/n 3116895. and red T.
This version is very thin and lightweight. Sharpening is easy and 15 iris aperture creates a perfect circle. The lens gives great pleasure in taking pictures.
Pre-set control with half stops between F4 and F22.
Min Focus distance is 1.5m.
Optical scheme: Triplet, 3 lenses in 3 group.
Optics: ★★★★★
Sharp, sharp, sharp. Great color reproduction and contrast in. But only with use with lens hood.
Ergonomics: ★★★★☆
Easy to use.
Build quality: ★★★★☆
Made of lightweight aluminum. Does not necessarily have to like the look.
Market value / value of subjective: ★★★★★
The first version of triotar barrell yo can see on this document: https://www.tontrennung.de/assets/documents/datasheet/000891.pdf
The third version of troitars barrel you can see on early pages: https://m42lens.blogspot.com/2013/04/carl-zeiss-jena-triotar-135mm-f4.html
Btw - this page is great - https://www.tontrennung.de/html/wissen/objektive/bauformen.html
Btw - this page is great - https://www.tontrennung.de/html/wissen/objektive/bauformen.html