Celestron
Celestron Inspire 100AZ Refractor
Best price $339 · 100mm aperture · $/mm 3.4
$339 on Amazon ↗At $3.4 per mm of aperture, this is dearer per millimetre than the typical refractor at $2.94/mm — you're paying for something other than raw aperture.
Specs
| Aperture | 100 mm |
|---|---|
| Focal length | 660 mm |
| Focal ratio | f/6.5 |
| Type | Refractor |
| Mount | Alt-Az |
| Resolving power | 1.16″ (Dawes limit) |
| Limiting magnitude | 12.5 |
| Max useful magnification | 200x |
| Light gathering | 204x the naked eye |
| Optical design | Doublet Refractor |
| Warranty | 2 Year Warranty |
| Best for | Beginner, Visual |
Resolving power, limiting magnitude, maximum useful magnification and light grasp are derived from the aperture — the standard formulas, not marketing claims.
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