- Delivers images remarkably free of chromatic abberation
- 100mm aperture and 900mm focal length (f/9.0) is ideal for planetary and lunar study
- Outfitted with a 2" Crayford-style focuser for exceptionally smooth focusing with no backlash
- Molded-in dovetail base accepts any Orion finder scope
- One-year limited warranty
Recently, Astronomy magazine ran a "buyer's guide" to portable 4" apochromatic refractors. All were impressive scopes, no doubt. But considering their price tags, which ranged from $2,695 (yes, that was the cheapest) to $3,595, you'd be excused if you didn't run right out and throw down your credit card for one.
Here's something more practical: our 100mm ED apochromatic refractor. Priced well under $1,000, it's by far the most jaw-dropping value in high-end refractors ever offered. The ED100 delivers images remarkably free of chromatic aberration, thanks to its fully multi-coated 100mm objective doublet. It's crafted with one element of FPL-53 extra-low dispersion ED optical glass from Japan. The 100mm aperture gives it 56% greater light grasp than our ED80, and the 900mm focal length (f/9.0) is ideal for visual planetary and lunar study and excels for imaging work as well.
The baffled, 36"-long aluminum tube is outfitted with a 2" Crayford-style focuser for exceptionally smooth focusing with no backlash. It accepts both 2" and 1.25" diagonals. A molded-in dovetail base accepts any Orion finder scope.
The revolution in affordable apochromatic refractors continues with the Orion ED100. Order yours today.
User level Level 3
Optical design Refractor
Optical diameter 100mm
Focal length 900mm
Focal ratio 9.0
Coatings Fully Multi-coated
Optics type Air-spaced doublet
Glass material Extra low dispersion FPL-53
Eyepieces included None
Resolving power 1.16arc*sec
Lowest useful magnification 16x
Highest useful magnification 200x
Limiting stellar magnitude 12.7
Optical quality Diffraction limited
Focuser 2" Crayford
Mount style Optical Tube without Mount
Astro-imaging capability Lunar, planetary & long exposure
Tube material Aluminum
Length of optical tube 36.0 in.
Weight, optical tube 7.0 lbs.
Additional included accessories Camera adapter
Other features One Element ED glass in apochromatic primary lens, Crayford focuser, Machined aluminum lens cell
Warranty One year