BORG Objective Lenses

BORG Objective Lenses.

Apochromat And Achromat Objective Lenses To Build Or Upgrade Your Borg Telescope.

Borg 77Ach Objective - High Performance Achromat.
This objective provides good visual performance. Small degree of spherical aberration at C-line (H-alpha) is optimized for H-alpha narrowband filter. Made of environmentally fiendly
Eco-glass. Front and rear caps included.

Specifications:
Aperture - 77mm
Focal Length - 500mm F6.5
Objective - Achromat, 2 elements in 1 group, fully coated
Total Length - 110mm (hood retracted)
Total Weight - 450g (1.0lbs)
Filter Thread - 77mm

Borg 77ED Apochromatic Objective - Borg's standard objective lens.
Most popular Borg objective lens. ED element provides sharp images. Front and rear caps
included.

Specifications:
Aperture - 77mm
Focal Length - 500mm F6.5
Objective - Apochromat, 2 elements in 2 groups, fully multicoated
Total Length - 110mm (hood retracted)
Total Weight - 500g (1.1lbs)
Filter Thread - 77mm

Borg 101ED Apochromat Objective.
Gives an extremely sharp image of less than 2-4 microns between red and green
wavelengths.
Excellent for high-power planetary viewing. High performance imaging when used with Borg
corrector lenses. Made of Eco-glass. Hood retracts for maximum compactness. Includes a
storage bag, and front and rear caps.

Specifications:
Aperture - 101mm
Focal Length - 640mm F6.3
Objective - Achromat, 2 elements in 2 groups, fully multicoated
Total Length - 210mm (hood retracted)
Total Weight - 1100g (2.4lbs).