| This 22mm Celestron Ultima LX is an exceptional low to medium power wide field 2" eyepiece with a very wide 70° field of view. It is particularly well-suited to observing with Dobsonian reflectors and medium to fast focal ratio refractors (it provides a big 4.9mm exit pupil for rich field observing on an f/4.5 Dobsonian, for example). However, it provides near “picture window onto space" images with any telescope type and is a superb eyepiece to replace the so-so 1.25" 25mm or 26mm that is usually supplied as standard equipment with many new scopes. You can use the calculator below to see just how wide the field will be with your particular telescope. For example, it will give you a 1.35° field at 51.9x with a 10" f/4.5 Dobsonian, more than enough to take in all of the Pleiades at one time. This gives you almost five and a half minutes of uninterrupted observing with such a scope while an object drifts from one side of the eyepiece’s flat field to the other. That’s plenty of time for multiple observers to look at the same object, or for you to absorb as much detail as possible, before having to reposition the scope. It is also excellent for medium high magnification observing with long focal length refractors, reflectors, or catadioptric scopes. On a 14" Schmidt-Cassegrain, for example, it yields 177x. This is an excellent magnification for planetary and close-up lunar observing and binary star splitting.
With a usable eye relief of 16mm, the 22mm Ultima LX will provide nearly unvignetted views for most eyeglass wearers, although some vignetting is unavoidable if you must wear eyeglass while observing due to severe astigmatism.
This is an excellent eyepiece for observing galaxy clusters, framing emission nebulas with the black of space, observing the nebulosity around the Pleiades, etc. The 22mm Ultima LX would be a welcome addition to any serious deep space observer’s eyepiece collection. At 19.2 ounces, the 22mm 2" Ultima LX is a very substantial eyepiece. Be sure that your star diagonal is very firmly locked in place in your scope on your scope before inserting this eyepiece to avoid the chance of the diagonal swiveling unexpectedly and the eyepiece falling to the ground.
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