This is a fascinating niche topic. The is a Soviet collapsible 50mm f/3.5 lens, directly inspired by the pre-WWII Zeiss Tessar. Unlike modern lenses, Soviet optical plants had a chaotic serial number system that can actually tell you when and where your lens was made.
Here is a feature developed for a camera wiki, collector's guide, or blog post. By [Author Name] | Optical History
Do you have an Industar-22 with a serial prefix not listed? Email the author.
A method of teaching French as a foreign language, specially adapted for the Kingdom of Saudi Arabia. It has been authorized by the Ministry of Education in the Kingdom of Saudi Arabia.
Levels 1 and 2 cover level A1.1 of the Common European Framework of Reference for Languages (CEFR).
For further information, please refer to our website in its French version.
