Average Reviews:
(More customer reviews)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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With a wide 43-deg apparent field, Orion's Sirius Plossl line of telescope eyepieces provide clear, sharp images of impressively high contrast. They're suitable for all telescope types: reflector, refractor, and catadioptric. Each 4-element Sirius Plossl eyepiece 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 eyepiece is fitted with rubber eyeguards and internally threaded to accept standard filters.
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