Celestron
Celestron StarSense Explorer DX 102AZ Smartphone Telescope
Best price $439 · 102mm aperture · $/mm 4.31
$439 on Amazon ↗At $4.31 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 | 102 mm |
|---|---|
| Focal length | 660 mm |
| Focal ratio | f/6.5 |
| Type | Refractor |
| Mount | Alt-Az |
| Resolving power | 1.14″ (Dawes limit) |
| Limiting magnitude | 12.5 |
| Max useful magnification | 204x |
| Light gathering | 212x the naked eye |
| Optical design | Doublet Refractor |
| Highest magnification | 204x |
| Dawes limit | 1.14 arcseconds |
| Tube length | 813mm |
| Tube weight | 5 lbs |
| 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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