Our friend at TEC, Yuri Petrunin, regularly reads this and other Cloudynights forums. He knows a load of Russian optical and astronomical folks, and wrote me with some additional information on Borisov's telescope. Here's some of what Yuri wrote, with his permission to put on CN. The only purpose here is to give proper credit where credit is due.
Start this with a Google search on "valery terebizh". You will be amazed.
All of Borisov's comets were discovered with telescopes designed by Dr. Valery Terebizh (VT), an excellent optical designer of a number of different wide-field, low focal ratio astrographs. Many of Terebizh's designs have been built, including all the instruments Borisov used to discover comets listed below.
Comet Instrument Design
C/2013 N4 (Borisov) GENON VT78-A (First comet of independent Ukraine)
C/2013 V2 (Borisov) GENON VT78-A
C/2014 R1 (Borisov) GENON Max same but scaled 1.5X or other VT design
C/2014 Q3 (Borisov) GENON Max same but scaled 1.5X or other VT design
C/2015 D4 (Borisov) GENON Max same but scaled 1.5X or other VT design
C/2016 R3 (Borisov) GENON Max same but scaled 1.5X or other VT design
C/2017 E1 (Borisov) GENON Max same but scaled 1.5X or other VT design
C/2019 Q4 (Borisov) no name yet VT-8b scaled (Hamilton)
This site is interesting, but fails to mention that the optics for all the GENON scopes above were designed by Terebizh:
Yuri said that the optics for Borisov's 650mm F1.5 system were made by highly skilled professional opticians. Borisov evidently made and assembled the telescope mechanical parts, but he did not make the optical components.
The telescope is installed in the dome that belongs to Roscosmos, a company that does government military orders for satellite tracking programs.
When translated to English the first paragraph states: "Director General of Roscosmos State Corporation Dmitry Rogozin met with an employee of the Crimean Astrophysical Observatory Gennady Borisov. Using a telescope reflector of his own manufacture, the astronomer made the discovery of the first interstellar comet."
Borisov really put Ukraine on the map by discovering this interstellar comet. But to clarify, "...of his own manufacture" does not mean Borisov made the optics, rather he had them made and integrated them into his telescope structure.
I don't know if any of this really matters, except to give Valery Terebizh proper credit for all the telescope optical designs used for Borisov's comet discoveries.