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Celestron Cometron 7x50s Review

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Celestron Cometron 7x50s Review

By Zane Landers


This review describes the Celestron Cometron 7x50s including my initial impressions along with examination during actual use for around 1 month. I live in a suburb in New England under Bortle 6-7 skies. I have 3 telescopes, the oldest of which I have had for one year.


The Cometrons currently retail for $26 on Amazon (MSRP is $55)


Selecting the Cometrons

I had heard about observing with binoculars before but believed it was all just a strange fad, done by skilled observers at dark sites. When I was in the French countryside and looked at M31 with my family's cheap 8x26 binoculars I decided I had been completely wrong, and began doing some research. I found that most good beginners' 50mm binoculars fell in the price range around $100, which I didn't really want to spend. The reason for this price is the expensive BAK-4 prisms and supposedly better coatings than cheaper binoculars, which usually use BK-7 prisms. The vast majority of under-$100 binoculars, including the Cometrons, I heard, had collimation problems and light loss, due to the inferior build quality, prisms, and coatings. I know Celestron's customer support is usually quite good and I figured that they would ship me a replacement if my pair wasn't collimated, and I could always return them if they were still horrible. So I ordered them on Amazon and waited.


Build Quality

I was rather impressed with the quality of the Cometrons given their price. The whole body is rubber armored, and there are only a few areas where water could seep in. Celestron markets these binoculars as "water-resistant" and I suppose they are. There are large indentations on each side of the binoculars for your fingers to grip.


The center focusing knob is large and cylindrical, and has rubber notches that make it rather easy to adjust with gloves. The diopter adjustment has similar rubber notches and is very smooth to adjust.


The binoculars come with a case, neck strap, and cleaning cloth. From information in other reviews and on the product pages I had no idea it came with any of these.


The one complaint I have about these binoculars is the lens caps. While the eyepiece caps are hard plastic and grip the eye guards rather tightly, the front lens caps are bendable rubber which easily fall off. My fingers once accidentally touched the glass while I tried removing them from their case.


Optical Quality

The largest complaint of binocular observers about BK-7 prisms, from what I've heard, is that they cut off the exit pupil. While this is true with the Cometrons, the sides of the exit pupils are pinched by a small enough amount that it is rather difficult to notice.


The Cometrons have a 6.8-degree field of view, which means that at 7x the apparent field is 45-47 degrees. Compared to my 55-degree Plossl eyepieces in my telescope this is a bit narrow, but it is fine for normal use. The field has next to no distortions except right along at the edge of the field stop, where it's hard to tell anyways. Chromatic aberration on the Moon is remarkably controlled as well.


Viewing Impressions

I have used the Cometrons several times, under both crystal clear and partly cloudy conditions. Keep in mind that the following observations were made at my home in a Bortle 6-7 zone.


M31 is rather easy to find and is a clearly prominent fuzz with little to no detail. It is remarkably bright though.


M42 appears similar to what it does in a small telescope, just a smaller. The wings are visible with averted vision, and the the whole region has a slight glow.


The region around Cassiopeia and Auriga is beautiful, similar to diamonds strewn across black velvet. 


The Pleiades and Hyades are both simply stunning, showing many stars.


The Moon shows remarkable detail, especially when seated in a chair. The Earth's reflected light on the unlit side of the Moon is extremely evident in the binoculars, unlike with a small telescope.



The Celestron Cometron 7x50s are a fantastic bargain for the price and I would wholeheartedly recommend them to anyone interested in astronomy with a budget below $100. I am planning on supplementing them with better binoculars but I think that for the price you simply cannot get anything better. Even if you own a small telescope, I would still recommend these for quick peeks and wide-field views, and/or for travelling. If I do not bring a telescope to view the solar eclipse next year I will definitely purchase solar filters for these binoculars and bring them. For less than the price of a cheap Plossl it is difficult to not want a pair of these!


  • Carol L, Randolph Jay, paarth and 8 others like this


Please note that I originally wrote this in November.

Mar 07 2017 03:33 PM

Thank you for your review. Have you measured its aperture?

May 04 2017 11:03 AM

I must say this Is accurate, because I own these binos.

    • Augustus and Dutch Countryman like this
Dutch Countryman
May 30 2017 07:22 AM

An excellent review, with which I agree wholeheartedly.  I've really put these binos through the ringer over the past year.  I paid $28.95, including shipping.  I earned the AL's Binocular Messier certificate, and just a few days ago completed the Binocular Double Star program. I used only these binoculars, no mounts, though I would occasionally prop my elbows on a railing or back of a chair.  The views are just as good as you describe.  I've even seen a touch of green color in M42 (I guess my location is 4/5 on the Bortle scale).  I've also seen Neptune, Uranus, Vesta, the Gallilean moons, and of course a host of lunar features.  A clever design feature, perhaps compensating a bit for the BK7 prisms, is a wider than usual exit pupil.  Perhaps this is better for younger eyes, but I'm 54 and it does the trick for me.  This was my introduction to astronomy by the way.  Don't have a scope yet, but when I do get one, I'll always have my Cometrons nearby.  I can't imagine observing without them.

    • MariusR, Augustus, Wayne Costigan and 2 others like this

Thanks, Zane, for the good review.  I am looking for an entry-level bino that does not disappoint without spending a ton of cash. The Cometron fits the bill.  Thanks also to the other who chimed-in with their comments - also very helpful.  

    • Augustus and Dutch Countryman like this

I've now had these binos for a year and a half. I don't use them as much anymore now that I have a much higher quality pair of Bushnell 10x50s, but these still get a fair amount of use for travel and things. I'll be bringing them to watch the Falcon Heavy launch next week.

    • Dutch Countryman likes this

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