Quantum 4

My First Telescope - The BEAUTIFUL Quantum 4

Quatum 4 "Gregory or Spot Maksutov Cassegrain" Telescope. I purchased this used in August 1980 for $1000.
The original purchaser bought it in January 1979 for $1300 for the scope with special sliver coatings.
In 2017 I found that one sold on eBay for $1900.
"Gregory" or "spot" Maksutov Cassegrain

Specifications sheet

The "Gregory" or "spot" Maksutov-Cassegrain (Mak) optical system uses a combination of mirrors and lenses and is referred to as a compound or catadioptric telescope. This unique design offers large-diameter optics while maintaining very short tube lengths, making them extremely portable. The Maksutov-Cassegrain system consists of a corrector lens, a spherical primary mirror, and a secondary mirror spot. Once light enters the optical system, it travels the length of the optical tube three times. Typical focal ratio is f/13 to f/15 (my Quantum is f/15)

The cheatsheet that I used with my Quantum 4 for alignments and to note magnification.

A scan that I took of a slide that I took with the Quantum in 1980.

Telescope on Sky-Watcher Star Adventurer Tripod

Each hour is 15 degrees, so medium ticks are 5 degrees and smallest ticks are 1 degree.