Topic
Topic author: kds315
Posted on: 20190113044700
Came to me by coincidence when checking out a fleamarket, had that GOI in the back of my head somehow and bought it as it was a good price, and f2.8/200mm is very nice to use focal length for me (like my CZJ 2.8/200mm Sonnar).
And now I find out that it seems to be a rather rare prototype lens a friend of mine and member here told me, which hasn't been made often, computed in 1975 and made by GOI in St. Petersburg, the Russian State Optical Institute. Mine is from 1991.
It has Pentax-K bajonet mount and supposedly a 7e/6g lens design (I found on a russian site) - but my finding is, that it actually is a 8e/5g design, confirmed by 10 strong reflections I see (equals 5 lens groups).
My lens looks like this:
It has quite a nice modern multicoating (my lens is made 1991):
Here now a size and look comparision with the Carl Zeiss Jena Sonnar electric f2.8 200mm, to show how compact it is:
And now I find out that it seems to be a rather rare prototype lens a friend of mine and member here told me, which hasn't been made often, computed in 1975 and made by GOI in St. Petersburg, the Russian State Optical Institute. Mine is from 1991.
It has Pentax-K bajonet mount and supposedly a 7e/6g lens design (I found on a russian site) - but my finding is, that it actually is a 8e/5g design, confirmed by 10 strong reflections I see (equals 5 lens groups).
My lens looks like this:
http://forum.mflenses.com/userpix/20191/455_Telegoir_f28_200mm_side_1.jpg
It has quite a nice modern multicoating (my lens is made 1991):
http://forum.mflenses.com/userpix/20191/455_Telegoir_f28_200mm_front_1.jpg
Here now a size and look comparision with the Carl Zeiss Jena Sonnar electric f2.8 200mm, to show how compact it is:
http://forum.mflenses.com/userpix/20191/455_CZJ_Sonnar_f28_200mm_vs_Telegoir_f28_200mm_1.jpg
