Product Description
This is a very compact and relatively light (at 8 pounds) alignment telescope with very respectable specifications.
Tube Diameter – 1.7494 inches
Magnification – 20x at 2 inch focusing distance to 30x at infinity
Field of View – 1 degree
Erect image
Objective – 0.925 inches with low reflectivity protective coating
Reticle – Glass filar / bi-filar pattern
Focus knob – located 3.625 inches from objective end of barrel
Overall length – Approximately 9.500 inches
The autoreflection target is concentric to the line of sight to within plus or minus 0.001 inches. Paired line spacings of 0.012 inches, 0.036 inches, and 0.110 inches are suitable for use at distances up to 100 feet. Target also has a circle of 0.092 inches radius.
This is as close to perfect a Brunson Model 381 Alignment Telescope you will find anywhere baring purchasing a new instrument. The barrel is unblemished, the painted portions look new, and the glass is perfect. Even the cabinet looks new.