Orion 7.5-22.5mm Premium Zoom Telescope Eyepiece | Orion Telescopes

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Orion 7.5-22.5mm Premium Zoom Telescope Eyepiece

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High quality zoom telescope eyepiece designed for convenient, comfortable, and crisp views of the night sky
Large eyepiece focal length range of 7.5mm to 22.5mm provides a variety of magnifications from high-power to moderate
Comfortable eye relief range of 19.5mm at 22.5mm focal length, and 18mm at 7.5mm focal length makes this an ideal zoom eyepiece for eyeglass wearers
Fully multi-coated lens elements and glare-threaded barrel maximize the contrast and brightness of your views
1.25" barrel is threaded for use with 1.25" Orion eyepiece filters

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Item # 08238

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You've just managed to center a hard-to-find object in your low-magnification eyepiece's field of view. After several moments of admiration, you decide to zoom in for a closer look. But that usually means swapping out your eyepiece several times, as you increase magnification. The slightest bump or jiggle, and you may have to relocate and center the object all over again. Suppose after several swaps to zoom in, you realize the object is best-viewed at low magnification?

With Orion's new Premium Zoom Telescope Eyepiece, the problem is solved! The Premium Zoom is an elegant and convenient alternative to using multiple telescope eyepieces of differing focal lengths to achieve views of differing magnification. With the Premium Zoom, you simply adjust the focal length up or down according to your preference, without having to remove the eyepiece from the telescope focuser.

The Orion Premium Zoom Telescope Eyepiece features a focal range of 22.5mm to 7.5mm, with marked indicators for settings of 7.5mm, 12mm, 17mm and 22.5mm. The wide range of focal lengths allows you to enjoy the finer details of an object, as well as its more apparent features, while leaving the eyepiece securely seated in the focuser. The large ocular lens provides comfortable viewing with a 42 degree apparent field of view at 22.5mm, and a 66 degree field of view at 7.5mm.

The telescope eyepiece, which consists of eight lens elements in five groups, is fully multi-coated (all air-to-glass surfaces) with anti-reflection coatings for clear, crisp views. The lens edges have been blackened to prevent glare. Dual-purpose threading of the 1.25" barrel enables the eyepiece to be used with Orion filters, while also preventing glare.

The Orion Premium Zoom, made of black anodized aluminum construction, was designed with viewing comfort in mind. It features generous eye relief of 19.5mm at the 22.5mm focal length setting and 18mm at the 7.5mm focal length setting. A twist-up rubber eyeguard and rubber knurled grip ring for focal length adjustment round out the aesthetic features of this high-quality, high-performance telescope eyepiece.

Weighs 10 oz. Dust caps are included.

Warranty

Limited Warranty against defects in materials or workmanship for one year from date of purchase. This warranty is for the benefit of the original retail purchaser only. For complete warranty details contact us at 800-676-1343.

Warning

Please note this product was not designed or intended by the manufacturer for use by a child 12 years of age or younger.

Specs

Design

Design

Different eyepiece designs allow for a wide range of features, depending on the needs of the observer. Orthoscopic and Plossl designs can provide a great quality image with a standard field of view, but may be difficult to use at higher powers while wearing glasses due to the short eye-relief. Long eye-relief designs have more elements and can be more expensive, but work very well with glasses, even at higher powers. Wide angle designs provide a larger view of the sky at the same power as a standard eyepiece. More complex designs can combine all these attributes together in a single eyepiece.

Proprietary
Eyepiece focal length

22.5mm - 7.5mm
Barrel size

1.25"
Apparent field of view

Apparent field of view

The edge-to-edge angular diameter of the image displayed in a binocular as seen by the eyes of the observer. It is an inherent specification for a given binocular design. The "angular diameter" of an object is defined as the angle an object makes (subtends) as seen by an observer.

42.0° - 66.0°
Eye relief

Eye relief

The distance, measured in millimeters, between the observer's eye and the eyepiece lens in which the entire field of view remains visible. Eye relief varies with the optical design but generally increases with decreasing magnification. Long eye relief is advantageous for observers who wear glasses, as they don't have to put their eye directly on the eyepiece to see the entire field of view, nor do they have to remove their eyewear.

19.5mm
Coatings

Coatings

Binocular lenses and prisms are often coated with anti-reflective material to minimize light loss as light travels through the multiple optical surfaces of a typical binocular. Coatings help maximize the amount of light transmitted through each glass surface of a binocular, so as much light as possible reaches the observer's eyes to provide a bright and sharp image.
Good lenses are at least "fully coated," with a single layer of magnesium fluoride coating applied to each air-to-glass lens surface. Multiple layers of coatings are even more effective; the term "multi-coated" means one or more air-to-glass lens surface has multiple coatings. "Fully multi-coated" optics are even better, meaning all lens surfaces have multiple layers of anti-reflective coatings applied for maximum light transmission and optimal image quality.

Fully multi-coated
Number of elements

8
Filter threads

Yes
Parfocal

Parfocal

Parfocal refers to an attribute of an eyepiece set where little to no focusing is required when swapping out one eyepiece for another.

Yes
Field stop diameter

Field stop diameter

The field stop is a mechanical ring in the eyepiece which provides the sharp edge to the field of view when looking through the eyepiece. The field stop diameter greatly affects the apparent field of view of the eyepiece; the larger the field stop diameter, the larger the apparent field of view is.

24.9mm
Barrel security recess

Barrel security recess

The barrel security recess is a shallow groove or depression cut into the 1.25" or 2" barrel of the eyepiece. In the event the thumb screw holding the eyepiece in the focuser becomes slightly loose, the eyepiece will not fall out because the tip of the thumb screw will catch on the lip of the security groove.

No
Blackened lens edges

Blackened lens edges

Blackened lens edges in eyepieces and refractor lenses prevent unwanted light scatter inside the tube. This results in higher image contrast.

Yes
Rubber eyeguards

Yes
Body material

Aluminum
Case

No
Weight (oz.)

10
Warranty

Warranty

This warranty gives you specific legal rights. It is not intended to remove or restrict your other legal rights under applicable local consumer law; your state or national statutory consumer rights governing the sale of consumer goods remain fully applicable.

One year

In The Box

Orion Premium Zoom Telescope Eyepiece
Dust caps

Shipping Info

Orders received by 1pm Eastern Standard Time for in-stock item the same business day. Order received after noon will ship the next business day. When an item is not in-stock we will ship it as soon as it becomes available. Typically in-stock items will ship first and backordered items will follow as soon as they are available. You have the option in check out to request that your order ship complete, if you'd prefer.

SHIPPING RESTRICTIONS APPLY FOR THIS PRODUCT

This product is available to ship Standard delivery within the 50 US states, APO/DPO/FPO addresses and US territories/protectorates. Delivery is not available to Canada.

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NOTE: Orion is proud to offer high quality certified solar filters to fit a variety of our telescopes and binoculars. We believe that solar viewing is best done with the additional features and details that can only be achieved with the enhanced magnification a telescope or binocular provides. We have chosen to not carry eclipse glasses. Find all of our solar viewing products here!

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Since 1975 Orion Telescopes & Binoculars has been offering telescopes for sale direct to customers. Now an employee-owned company, we pride ourselves on an unswerving commitment to best quality products, value and unmatched customer care. Our 100% satisfaction guarantee says it all.

Orion offers telescopes for every level: Beginner, Intermediate, Advanced, and Expert. From our entry level beginner telescopes for amateur astronomers to our Dobsonian telescopes to our most advanced Cassegrain telescopes and accessories, you can find the best telescope for you. Because we sell direct, we can offer you tremendous value at a great price. Not sure how to choose a telescope? Orion's Telescope Buyer's Guide is a great place to start.

Orion binoculars are known for quality optics at a great price. We offer binoculars for every viewing interest, including astronomical binoculars, compact binoculars, waterproof binoculars, birding binoculars, and sport and hunting binoculars.

Orion's telescope and astrophotography accessories will enhance your telescope enjoyment without breaking the bank. Expand your viewing experience with accessories ranging from moon filters to power-boosting Barlow lenses to advanced computerized telescope mounts. Capture breathtaking photos with our affordable astrophotography cameras. And when you're stargazing, Orion's telescope cases and covers, observing gear, red LED flashlights, astronomy books and star charts will make your observing sessions more convenient, comfortable and meaningful.

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