Orion Telescopes & Binoculars 120mm ED
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- Optical Diameter: 120 mm
- Max Useful Magnification: x 284
- Mount Type: Unmounted
- Motorized: No
- Focal Length: 900 mm
- Optical Design: Refractor
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Large aperture apochromat at bargain price
Pros
Outstanding value for very high quality optic. Apos at this aperture size are prized possessions.
Cons
Optical tube, not a telescope, lacking all accessories except dew shield and dust cap/
Recommended it?
Yes
This is very likely the lowest priced Apochromatic optical tube, the heart of a refractor telescope, on the market at this (relatively large) aperture size of 120mm. The objective lens is made of highly specialized "ED" Extra low Dispersion glass that virtually eliminates annoying color fringing of high contrast images. The hallmark of a very high quality refractor telescope is one that produces no trace of a "purple haze" halo around a bright image.
Night sky observations of the planet and cresent Moon are well detailed with excellent image contrast. With excellent night sky atmospheric "seeing" conditions, this tube can be powered up to well over 200x magnifications without color abberations and can resolve images to slightly less than 1 arc-second.
That's good enough to see all but the smallest craters on the Moon (less than ~2.5 kilometers in diameter), the Cassini Division between the rings of Saturn, and the Great Red Spot on Jupiter. Certain surface features on Mars like the polar ice caps are even possible to see.
ENJOY!
Night sky observations of the planet and cresent Moon are well detailed with excellent image contrast. With excellent night sky atmospheric "seeing" conditions, this tube can be powered up to well over 200x magnifications without color abberations and can resolve images to slightly less than 1 arc-second.
That's good enough to see all but the smallest craters on the Moon (less than ~2.5 kilometers in diameter), the Cassini Division between the rings of Saturn, and the Great Red Spot on Jupiter. Certain surface features on Mars like the polar ice caps are even possible to see.
ENJOY!
