8-24mm zoom, 1.25"

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This Celestron zoom eyepiece is fully multicoated, with an 8mm to 24mm focal length range and a soft rolldown rubber eyecup for eyeglass use. The rubber eyecup can be removed to expose T-threads that permit direct connection of a camera T-ring and camera body for variable power imaging.

As with all zooms, the apparent field of view of this Celestron zoom decreases as the focal length increases. This generally results in a 20% narrower field of view at low powers and a 10% wider field at high powers than you can achieve with similar focal length single magnification eyepieces. This is just the reverse of what most people expect from eyepieces – which is a wider field at lower powers, where you’re usually observing larger objects that don’t need as much magnification to fit in the eyepiece field, and a narrower field at high powers.

Likewise, this Celestron zoom’s usable eye relief decreases slightly as the focal length decreases, from a specified 18mm at a 24mm focal length to 15mm at an 8mm focal length. Contrast is also generally a little lower than you’ll find in single magnification eyepieces of similar focal lengths. If these minor anomalies are not a problem for you, however, a zoom offers the convenient ability to precisely match the observing magnification to the seeing conditions, as well as offering a virtually infinite number of magnifications in a single reasonably-priced eyepiece.

The eyepiece has a safety groove cut into its chrome barrel that will catch the thumbscrew of your focuser or star diagonal and keep the eyepiece from falling to the ground should the thumbscrew accidentally loosen during use. The power change band on the eyepiece uses a broad knurled rubber gripping surface that makes it easy to make small power changes, even in cold weather when wearing gloves or mittens.

1 year
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Overall Product Rating: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics(4.00)   # of Ratings: 2   (Only registered customers can rate)

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1. Esraa on 4/30/2013, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
Hi it is a good eyepieces because you do not need to buy so many eyepieces at the same time you have many eyepieces.
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2. Christopher on 3/11/2013, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
The Celestron 8-24mm zoom is a solid value and very functional, although it won't blow anyone away with quality of build or innovative optics. Mine "clunks" very slightly when I shake it but this has not affected the quality of the views through it as far as I can tell.

I've put this eyepiece to use mainly for planetary and lunar observation as it has a usable field of view that would be considered narrow compared to many non-zoom eyepiece designs. I believe that it delivers a sharp, vivid image in the center of the field of view. Unfortunately the edges are not especially well corrected. Perhaps this is a part of the eyepiece design; perhaps it is a result of the "clunk" I occasionally hear.

This eyepiece has come in handy during outreach events because I rarely have to change it out regardless of observing target and I don't worry about the cost as much if it gets damaged.

I think this would be an ideal eyepiece for a new astronomer on a budget, but due to build and optical quality I'm reluctant to give it more than three stars.
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Celestron - 8-24mm zoom, 1.25"

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Celestron - 8-24mm zoom, 1.25"
 AstronomicsAstronomicsAstronomicsAstronomicsAstronomics (Average: 4.00 | Users: 2)  Only registered users can submit ratings - Register Here
Our Product #: C824Z
Manufacturer Product #: 93230
Price: $74.95  Ground shipping for this item is $8.95 - Click for more info
By adding 1 of these items to your cart your order total will be less than $100, and will ship within the 48 contiguous United States for $8.95. Add $25.05 to your order, however, and you qualify for free ground shipping (heavy items with fixed shipping, such as counterweights, excluded).
MSRP: $112.95

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This fully multicoated Celestron 8-24mm zoom eyepiece gives you a virtually infinite number of magnifications in a single very reasonably-priced eyepiece . . .

. . . our 39th year