This 32mm Celestron Ultima LX gives you all you want in a low power 2” eyepiece – a very wide 70° field of view, sharp images, very good 16mm eye relief, and an affordable price. It is particularly well-suited to get the maximum image brightness and field of view out of big Dobsonian reflectors, but will work well with any telescope that can use 2” eyepieces, even an f/15 Maksutov.
This eyepiece has a very large 7.1mm exit pupil with an f/4.5 scope, larger than many observers’ eyes can dilate. This can effectively waste some of the scope’s light gathering capacity, as some of the full light cone will fall on the observer’s iris, rather than entering his or her eye. Even so, many observers willingly trade some light gathering for the very wide 70° apparent field of view of this eyepiece (nearly two full degrees with a 10” f/4.5 Dobsonian). This eyepiece very much provides a true “picture window of space” view. It is a good choice to step up from 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 1.96° field at 35.7x with a 10” f/4.5 Dobsonian, more than enough to take in all of the Pleiades at one time. This gives you almost eight 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 power magnification observing with long focal length refractors, reflectors, or catadioptric scopes. On an 8” Schmidt-Cassegrain, for example, it yields 62.5x. This is an excellent magnification for globular cluster and lunar observing.
With a usable eye relief of 16mm, the 32mm 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 32mm Ultima LX would be a welcome addition to any serious deep space observer’s eyepiece collection.
At 18 ounces, the 2” 32mm Ultima LX is a 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.