Orion EON 90 mm Triplet Carbon Fiber APO Refractor (SKU: 10386)

Orion EON ED90T CF 90/540 mm apochromatic refractor (Orion, SKU: 10386). The Orion EON ED90T CF is an apochromatic refractor with a 90 mm aperture and 540 mm focal length for visual observing and astrophotography. Its air-spaced triplet includes a low-dispersion element made of Hoya FCD-100 glass. The tube combines carbon fibre with aluminium components and a 2.5" rack-and-pinion focuser with 10:1 fine adjustment.

Key features

• fully multi-coated FMC optics and internal baffles to reduce stray light
• rotatable rack-and-pinion focuser and a separate camera angle adjuster
• retractable dew shield for easier transport
• tube rings with a handle and a 244 mm Vixen dovetail bar
• a separate field flattener is required for a flat field in astrophotography
• visual observing requires a suitable diagonal or extension tube; these accessories are not included

Included items

• optical tube: Orion EON ED90T CF
• tube rings with a handle
• adapter from 2" to 1.25"
• mounting bar: Vixen dovetail
• objective cap
• hard carrying case

Technical specifications

• optical design: apochromatic refractor, air-spaced triplet
• aperture: 90 mm
• focal length: 540 mm
• focal ratio: f/6
• low-dispersion elements: 1, Hoya FCD-100 glass
• optical coatings: FMC
• maximum focal-plane distance from the 2" accessory collar: 147 mm
• approximate useful magnification range: 13–180x
• resolving power: 1.29"
• limiting stellar magnitude: 12.5 mag
• accessory standard: 2" and 1.25" with adapter
• focuser: 2.5" rack and pinion, 10:1 fine adjustment
• focuser load capacity: 19 lb, approximately 8.6 kg
• mounting: Vixen dovetail bar, length 244 mm
• tube material: carbon fibre and aluminium
• length with dew shield retracted: approximately 450 mm
• maximum tube diameter: approximately 122 mm
• tube weight with rings and dovetail: approximately 4.4 kg
• manufacturer warranty: 12 months

The EON ED90T CF combines ED optics with a focuser for precise focus adjustment and accessories that facilitate mounting and transporting the tube.