25x100 Binoculars - Astronomy Binoculars, Astronomical Binocular

These binoculars perform at a much higher level than the price would lead you to expect... (click for more).

The Mark II version of our popular Gemini® 25x100 binocular is finally here!

Improvements over the last generation include:

All-new advanced optical design featuring a 5-element eyepiece and F/4.65 focal ratio that yields better edge correction and center sharpness than the previous model
Superior multi-coatings for >90% total light transmission (>99.5% per surface!)
More precisely machined individual focusers with built-in 1.25" filter threads
Wider interpupilary range of 55mm to 73mm to accommodate more observers
Overall better fit and finish than the previous model

The massive 11-pound, 18-inch long Gemini® 25x100 are the ultimate in affordable long-range observing instruments. The 25x100 size by far represents the most bang-for-the-buck in the top aperture class.

These are heavy-duty giant astronomy binoculars. Everything about these instruments says "quality." Their attractive rubber armoring and hefty all-metal CNC-machined and cast aluminum construction is guaranteed to last for many years to come. The optical quality measures up to that of the precision mechanics, which makes these excellent instruments for binocular astronomy and wildlife observation. Fully broadband multi-coatings on all air-to-glass surfaces (including the BaK4 porro prisms) ensure bright, high-contrast images while minimizing internal reflections.

The 25x100 WP-IF version utilizes smooth, CNC-machined individual focusers that provide the precision focusing essential for maxim performance on astronomical targets. The outside of each ocular is threaded to accept standard 1.25-inch telescope moon or nebula filters, a great asset for those wishing to boost the capabilities of their binocular even further.

Eyeglass wearers will appreciate the generous eye relief of 17mm. Collimation can be adjusted by experienced users, if necessary.

Every Garrett Optical 25x100 binocular must pass a rigorous 14-point inspection that insures a high degree of both optical and mechanical performance, including accurate collimation. Any necessary adjustments are performed by a highly experienced technician on a U.S. Navy Mark V Collimator. Each 25x100 astronomy binocular is covered by our two-year warranty and 30-day return policy.

An added perk is that every Gemini Waterproof astronomy binocular comes with a deluxe heavy-duty carrying case with durable PVC armoring and aluminum trim. The cases are lined with soft, "egg-crate"-style foam for maximum protection.

The 25x100 WP-IF binoculars are the ultimate long-range observing instruments in their price class. Ideal for stargazing or daytime use. Their huge 100mm (four-inch) objective lenses and strong magnification give them a performance boost that simply can't be matched by lesser instruments. At night, these binoculars excel at deep space observation - nebulae, galaxies, and globular or open clusters will all reveal detail you never expected to see in a binocular. If you can make it to dark skies, you'll be amazed by their performance. The 25x magnification makes them decent for solar system observing as well, whether it's glimpsing the rings of Saturn and watching Jupiter's moons, or simply observing our own moon. Keep in mind that the size of these 25x100 binoculars and the resulting 11-pound weight will require a hefty mount, though the awe-inspiring performance will be worth it.

Tripod Package Available - Save $50:

Garrett Gemini 25x100 Binocular + Series 5000 Tripod - $649.95

Items must be ordered together to qualify for discount. Select your package with the check-box above, then click the "Add to Cart" button...

Click here for Technical Specs

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

Gemini® Waterproof Mk II Series Specifications

MODEL	Gemini 15x70 WP-CF Mk II	Gemini 20x80 WP-CF Mk II	Gemini 25x100 WP-IF Mk II
OBJECTIVE LENSES	70mm F/4.0; 2 Elements, 1 Group	80mm F/4.1; 2 Elements, 1 Group	100mm F/4.65; 2 Elements, 2 Groups
EYEPIECES	5 Elements, 3 Groups	5 Elements, 3 Groups	5 Elements, 3 Groups
MAGNIFICATION	15x	20x	25x
EYE RELIEF	17mm useable (18mm total)	16mm useable (17mm total)	16mm useable (18mm total)
EXIT PUPIL	4.7mm	4.0mm	4.0mm
APPARENT FIELD OF VIEW	63º	65º	63º
TRUE FIELD OF VIEW	4.2º (221 ft./1000 yds.)	3.3º (171 ft./1000 yds.)	2.5º (131 ft./1000 yds.)
WEIGHT	4 lbs., 13 oz.	7 lbs., 0 oz.	11 lbs., 0 oz.
LENGTH	11.0-in.	13.3-in.	18.5-in.
CLOSE FOCUS	15m	25m	35m
IPD RANGE	55-73mm	55-73mm	55-73mm
COATINGS	Fully Broadband Multi-Coated	Fully Broadband Multi-Coated	Fully Broadband Multi-Coated
LIGHT TRANSMISSION	>90%, total >99.5% per surface	>90%, total >99.5% per surface	>90%, total >99.5% per surface
WARRANTY	2-year limited warranty	2-year limited warranty	2-year limited warranty

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Here's what reviewers and customers are saying about Garrett Optical's Gemini 25x100 WP binoculars:

Praise for the last generation of Gemini 25x100... The updated Mark II version is even better!

These binoculars perform at a much higher level than the price would lead you to expect. Delivered double boxed in an aluminum pre-cut foam case. Excellent coatings on all surfaces deliver crisp images. The individual focus on each ocular is wonderful for astronomical viewing. I have a set of 15 x 70 binoculars from a well known supplier, and these blow them away as far as what you can see, and have much less false color.
- Ken Russel

After spending 3 nights at the viewing end of my new 25x100 binoculars, all I can say is WOW! I spent hours and hours rediscovering all the objects in the sky that I thought I'd already seen and knew so well. What a new found and enjoyable perspective on the sky! And a welcome break from the computerized go-to SCTs. Under extremely dark, dry and moonless Arizona skies outside Snowflake, AZ my first sighting was comet Swan. I'll always remember my jaw dropping. It was big, bright and a far far cry from the view through my 7X50 [...]. Thanks for the service, products, prices and views that you bring to the amateur astronomer looking to break out of their rut and discover a new way to see the heavens. WOW!
- Bill Wood

The Garrett Optical Gemini 25x100s are the real thing. They give great views of stars, clusters, Galaxies and Nebulae. They exhibit a very high quality of build and Zach Garrett inspires confidence in his readiness to stand by his product. Theyï¿½re not for Lunar or Planetary observing ï¿½ theyï¿½ll do an OK job there, but the color (Chromatic Abberation) on the moon and the flaring on bright objects like planets will prove distracting. If you decide to acquire these make sure youï¿½ve got a mount that will easily handle the ten pounds, do take the time to balance them correctly, and seriously consider adding an index finder. So configured and equipped, they will provide outstanding and memorable tours of the night sky.
- Art Fritzson
Click here to read Art's observing report on CloudyNights
Click here to read the review on Astromart.com

I have used a variety of binoculars (and telescopes) for astronomy for many years, and took a long time to decide which '100s' I wanted. After reading numerous reviews, I chose these, and bought them from you because of your "we check the optics and collimation" promise. The 25X100 IF work great right out of the box. These are impressive, cost effective hardware to keep on a tripod by the back door for "grab & go" viewing. [...] just came in from spending time with the Pleiades, Saturn, Orion, Beehive, Double Cluster, etc. Best binocular views I have had from my back yard. As an unexpected bonus, they have enough focus range to allow me to view without my 7 diopter (nearsighted) glasses on! I did not expect that. [...] Thank you.
- Bill Halsey

The 25 x 100 WPs are fantasticï¿½even better than I expected. I have been sketching a variety of Messier objects and found the following numbers: M3, 10, 12, 14, 53, 57, 63, 64, 65, 81, 82, 84, 86, 97, 101, 108 and NGC4490, a small galaxy just off Chara in Canes Venatici. If there is some off-center coma it certainly isnï¿½t as bothersome as some have stated on the internetï¿½although maybe Iï¿½m just not as discriminating. Yes there is color fringing around bright objects, but I have my Vixen 90mm FL for Jupiter, Saturn and Venus. I didnï¿½t find views of the moon at all objectionable. The 25 x 100s are really helping me re-hone my starhopping skills. The T-Mount Light really works well and is rock solid atop my Bogen tripod [...]. Everything is working beautifully and I really find the 1X finderscope helpful. I highly recommend both the 25 x 100 WP binoculars and the T-Mount. I do feel the centerpost extension is a requirement, at least it is for my interpupilary distance. Set up and take down is a snap and the T-Mount really gives me a comfortable view from a lawn chair. Even though I got the CP version the binoculars hold focus beautifullyï¿½even pointed at the zenith. I expect all the Messier objects should be viewable from my backyard as well as a substantial number of the Herschel list. Anyway, thanks for providing a great product and service to back it up.
- Mark Sisson

It's been about a year since I bought a pair of 25x100 binoculars, mount and accessories from you. The binoculars are still first rate. I'm constantly amazed at what I can find in my back yard on a decent night over here in Stillwater, OK. It's funny, but the 25x100's just beat the pants off my 90mm Vixen Fluorite on anything deep sky. Yes, the Vixen tops the binocs on the moon, planets, tight doubles--anything that requires higher magnification, but at a very hefty price bump. When [Comet] 17B Holmes comet was up they worked beautifully. I took them to the Okie-Tex star party last Octtober in Black Mesa and had, arguably, my best view of M31 under a fantastic sky--I thought it rivaled my 15" Obsession, not for detail, but for breadth/context. I'm continuing work work my way through the spring galaxies in Virgo, etc. Last fall, I even found a beautiful little galaxy in Canes Venatici, NGC 4490. Later when I looked at it with the Obsession I discovered it is two galaxies, NGC 4490/4485. Pretty impressive given my limiting magnitude and aperture. The unimount works great, too and is remarkably easy to set up and take down--a great quick look package Keep up the good work.
- Mark Sisson

These are sturdy well made binoculars with excellent anti reflective coatings. They came perfectly collimated with no eye strain to achieve sharp focus. Last night I put these binoculars side by side with an older pair of 100's (from another company) that cost over $1000. The Garrett Optical's gave more detail with lunar craters, and sharper separation in the double star Albeiro. The Pleiades were magnificient just filling the entire field of view. I am a long time amateur Astronomer, past president of 2 Astronomy clubs and a binocular fanatic, [having owned] at least 6 pairs. I strongly recommend these binoculars.
- Dennis Mishler