| Brand and Model: | Celestron Omni 40mm |
| Price ($USD): | $49.95 |
| Type: | Plossl |
| Focal Length: | 40 mm |
| Barrel Size: | 1.25 |
| Apparent FOV: | 43.0 degrees |
| Field Stop Dia.: | 0.0 mm |
| Eye Relief: | 0 mm |
| Elements: | 4 |
| Weight (lbs): | 3 |
| Description: | This is an economical good quality low power eyepiece with fully-multicoated optics. With a 43 degree field of view it has the widest field possible from a 1.25†eyepiece, markedly wider than competitively-priced 40mm Plössls. Its field stop (the rim inside the eyepiece that determines the field of view) is the inside of the eyepiece barrel itself, so you’d have to go to a 2†eyepiece to get a wider field of view. It’s designed for the big picture of emission and reflection nebulas, for seeing entire open clusters like the Pleiades in one field, and for scanning nebular remnants like the Veil. It will work well with any telescope type (with the exception of fast focal ratio Dobsonian reflectors), at any focal ratio from f/6 and up, under any seeing conditions. It works particularly well from dark sky sites where light pollution won’t reduce the contrast in its bright image. A soft rubber eyecup shields the eye from ambient light and folds down for more comfortable eyeglass use. A knurled rubber ring on the titanium-colored barrel provides a secure grip when changing eyepieces in cold weather. |
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