Orion’s AstroView 90 is the last decent inexpensive refractor that they seem to sell. Almost every other non-premium refractor Orion offers nowadays is plastic, cheaply-made garbage, so I suspect the AstroView 90 may soon be phased out and replaced with a new, lower-quality scope. But in the meantime, it’s a pretty nice instrument. Let’s do a deep review of Astroview 90 EQ Refractor now.
Does Optical Tube Of Astroview 90 Do Its Job?
The AstroView 90 is a 90mm f/10.1 achromatic doublet, using crown and flint glass in the standard Fraunhofer configuration. As a result of the f/10.1 focal ratio, it does have some easily visible chromatic aberration, but not enough to impact the sharpness of the views by a measurable amount.
The optics in the AstroView 90 are exceptionally good – a cut above a lot of the cheap achromatic refractors. I have been impressed by the views through these scopes. The AstroView 90 is also well-baffled and has decent interior paint, along with an ample-length dew shield. Stray light and glare are not issues.
The focuser on the AstroView 90 is a 1.25” rack and pinion unit made largely of metal, but with plastic knobs. I don’t ...