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- This 40mm eyepiece is ideal for all types of telescopes: reflector, refractor, and catadioptric
- Offers a 43 degree apparent field of view for clear, sharp images of impressively high contrast
- Fully coated with magnesium fluoride on every air-to-glass surface
- Superb for wide-field surveying and detailed observations of large diffuse subjects
- One-year limited warranty
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List
Price: $49.95 |
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New, lowest price : $39.95 |
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| Product Description |
| With a wide 50-degree apparent field (43-degree for the 40mm), our Sirius Plossl line of eyepieces provide clear, sharp images of impressively high contrast. They're suitable all telescope types: reflector, refractor, and catadioptric. Each 4-element Sirius Plossl is fully coated with magnesium fluoride on every air-to-glass surface. Lens edges are blackened to reduce scattering of stray light and maximize contrast. Lenses are mounted in black anodized aluminum housings with 1.25" chrome-plated brass barrels. Each is fitted with rubber eyeguards and internally threaded to accept standard filters. |
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| Optics Reviews Writed by Customer
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why 40 mm is better though
2004-07-09
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The reason to buy a 40 mm is to go to LOWER magnification to have a brighter view of deep sky object. This eyepice will give you (40/32) square (e.g. 1.5 times) brighter images of galaxies.
As galaxies are big enough not to require much magnification (most M list are >20 ' - compare with suns 32' diameter) lower magnification is actually better. Field of view is not that important if you can't see it because it is not bright enough - is it? I mean is better to see smaller galaxy then none.
NB. Depending of the F ratio you may not be able to use a 40mm though - see books - can't remember right now the rule for that. |
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Get the 32mm instead...
2004-06-18
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| The widespread existence of 40mm Plossl eyepieces with 1.25" barrels in most companies' product lines is a mystery. Most people get eyepieces in this focal length to get the widest possible field of view with a 1.25" barrel eyepiece - yet a 40mm Plossl witha 43 degree apparent field of view shows no more sky than a 32mm Plossl with a 52 degree apparent field of view! (In my scope, they both show about 1.35 degrees of actual sky). But the 32mm will have a wider apparent field of view and somewhat higher magnification. There's really no reason to buy the 40mm Plossl. But I did, a while back. Now I've learned. This eyepeice is actually of decent quality, although there is some minor astigmatism of the image towards the edge when I used it with my 6inch f/8 telescope (not seen in the shorter focal length Sirius Plossls). All the Sirius Plossls are good values, but get the 32mm version instead. |
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