This 2” Celestron Luminos 23mm eyepiece is a six-lens design with a very wide 82° field and minimal field curvature. This makes it particularly well-suited for use with flat field telescopes such as Celestron EdgeHD and Meade Advanced Coma-Free flat field catadioptric scopes and refractors with field flatteners. an excellent low power, It is also well-matched to big Dobsonian scopes. It has a 5.1mm exit pupil with an f/4.5 scope. That’s an exit pupil more in line with the maximum dilated pupil of most observers’ eyes to give you the full light-gathering of your big scope.
The 23mm Celestron Luminos gives you no-holds-barred low power deep space views with scopes having focal ratios down to f/4. It is marvelous for open clusters, nebulas, and globular clusters with any scope, and is very effective with fast f/ratio reflectors and refractors. That being said, it must also be noted that its very wide field also makes it convenient for moderate power lunar and planetary observing with larger Dobsonians, as you have much longer to observe before the planet drifts out of the field and the scope has to be repositioned. The calculator below will show you how wide a field you can expect with your particular telescope.
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