Celestron – SkyMaster 25X70 Binocular – Out of doors and Astronomy Binoculars – Robust 25x Magnification – Huge Aperture for Lengthy Distance Viewing – Multi-Lined Optics – Sporting…

I originally gave these four stars because the focus has play in it. I bumped them up to 5 stars because of the low price and the fantastic astronomical views. They stay in the focus you put them in, but the play occurs only during adjustment. My 16×50 is much better for daytime sight seeing.

1. The eyepiece lens is 23mm, vs 18mm for my Nikon Aculon 16×50, 16mm for my Celestron 10×50, and 13mm for my Tasco 7×35. Despite this, they have the same eye relief as the smaller binoculars, and also a moderately smaller apparent field of view.
2. I followed the exit pupil, drew a triangle, and quickly and accurately measured the apparent field of view of the Celestron 25×70 to be only 57.5 degrees, and that is the maximum no matter where your eye is. My Nikon’s are 61 degrees, my Celestron 10×50 is 60 degrees, and my Tascos are 58 degrees. Visual observation confirms these math measurements.
3. They are noticeably heavier than my other binos, but not a lot.
4. They are easy to hand hold very steady in the day time, without resting my elbows on anything. At night it is much better to have something to brace my elbows on.
5. They look like they are good quality, other than the thin strap.
6. They are 10.4 inches long, and 8 inches wide.
7. There depth of focus is less than that of lower powered binoculars, so I really have to adjust them as I aim around at stuff terrestrially at different distances. These are better for astronomy than for birding. My 10x and lower did not need to be adjusted much unless I looked at something really close. My 16x is in between, but still pretty forgiving.
8. The focus is smooth but has a short lag, and requires diopter adjustment of the right eye to compensate for the lag. In cold weather, the focus wheel is tighter than any of my other binos, but still reasonable enough to turn.
9. I am a bit near sighted, so I get a closer near focus at around 50 or 60 feet instead of the advertised 75 ft. My nikons near focus at 18 ft, not their advertised 28 ft.

As many other reviewers already said, the eyepiece barrels seem too big around, and pinch my nose if I try to get closer to the eyepiece. However, if I carefully measure the interpupilary distance, I can place them so I see the full field of view without the pinch. It just does not come as naturally as with my 10×50. I separated them to see if getting one eye closer would give a bigger field of view, but it did not. I guess how close I get is close enough. It just feels weird them being that far out on my nose and making that third point of contact like that. Edit: next day: I’m getting used to the new feeling.

The correct place to hold these binoculars is by the barrels in front of the prisms. That is how to get steadier views. Better yet, slouch down in a chair and put your elbows on the arm rests. Then all you’ll see is your heart beat.

I looked at a distant light, and compared its size to the Nikon’s 16x. I find it very believable the Celestrons are 25x.

The field of view is not as wide as advertised. The apparent field of view is 57.4 degrees, not 61. The belt of Orion just barely fits in the view. The moon is 30% of the view. The true field of view is 2.4 degrees, not the advertised 2.7 degrees.

The arms of the eyepiece adjuster also have some wiggle in them causing a 1/4 inch delay when turning the adjuster wheel. I have had to re-adjust the right diopter even when I did not touch the center wheel, indicating it might be moving a bit. But it does not take long to get back into focus. There is also a flare visible off to the side of the exit pupil, though I don’t see it during astronomy.

Despite these flaws, I can’t subtract a star at only $70 shipped. These binoculars are a league above my 10×50 for astronomical viewing, at least in terms of looking at individual targets. A telescope has many advantages, but these are grab and go. However, to see the phase of Venus, you need to stop down the aperture and sit down to brace your view.
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I easily saw the correct shape of the Orion nebula on a half moon when my 10×50 could see nothing.
I could see the dark side of the half moon, whereas my 10×50 could only see the bright side. My 16×50 also saw the dark side.
Jupiter looks much bigger in the 25×70, but I may need to reduce the aperture to see the stripes. I can see bands on Jupiter 114mm f8 Newtonian telescope at 28x, but I can’t see bands at 25x in the binoculars.
The Pleiades look much better in the 25×70 than in the telescope or my other binoculars.
The double cluster in Perseus is clearly visible in the 25×70, and looks tiny with an almost stellar core in my 10×50.
Andromeda, M31, looks better, with M32 and M110 noticeable by it, and very hard to see in my 10×50.
I can see a tiny ring around Saturn at 28x in my telescope, but at 25x, I sometimes see a ring around Saturn and sometimes I don’t. On the day that I could see a ring, my 16×50 detected ears.
I can see M13 and other globular clusters as small fuzzy balls. I could find them in my 16x, but smaller. In my 10x, I can locate most of them, but they look like stars. Maybe I can detect a little fuzz on M13. In my 7x, I can’t locate most of them, but I can see M13 and maybe a few others, though I don’t remember.
All of my observing was hand held, unbraced.
I could point them at whatever I wanted and hit my targets just fine. I had trouble hitting Andromeda right away because I could not see it naked eye.
M82 and M81 are easy to identify in my 25×70 as I sweep over them. I can see the cigar shape of M82 in my 16×50 too, though I can’t find either one in my 10×50.
I can see a mountain range on the moon in the 25×70 when my elbows are braced. I’ve not yet found it in my 16×50.
Airplanes look bigger but take longer to find in my 25×70.
At 25x, you can’t tell where you are in the sky from the star orientations. You just have to point and look, and you know where you are when you see the object you are looking for. At 16x, I can pan around from bright star to bright star and figure out where I am by memory. At 10x, I can see some bright stars in the same field of view, but have to pan for others. And at 7x, you can easily see where you are.
I actually think my view of M31 was more enjoyable in a 15×70 than in these 25×70, though I know the Orion nebula is better at 25x. It keeps getter better even at 60x.
M33 can be located at lower power, but the 25×70 gave the best view, giving maybe a hint of spiral structure.

These aren’t your $1500 optics where you’ll get super sharp definition at a long distance but they work great. I use these to just sit and watch mountain sides for animals, or just seeing what might be going on waaaaaaay over there, and I plan on using them as spotting optics for hunting in the future. They let in a TON of light, which at night is great for viewing the stars and moon, however I think that is where the “fuzzy” view comes in during the day when looking at a long distance. It loses some of the definition when the light situation is very bright.

Kids love them, I love them, and they work really well. Saw them listed in a bino article online for best bang for the buck, and these fit the bill perfectly. Only loses a star for the definition, still a great buy and if I broke them, I’d buy them again in a heartbeat.

Hace falta decirlo, a mi parecer, una excelente relación calidad/precio, vienen cuidados, limpios, las lentes son de excelente calidad, se sienten robustos y cumplen lo que prometen. Sin embargo hay que aclarar, estos binóculares requieren de un tripié, es posible observar con ellos con solo las manos pero pesan bastante y se vuelve cansado, igualmente es necesario mencionar que el aumento (el cual es increíble para observación de astros, la luna, paisajes etc) deja al límite la posibilidad de tener una imágen estable sin tripié. Hace unos días estuve observando el cielo en busca del cometa C/2022 E3 (ZTF), el famoso cometa verde, a pesar de lo tenúe que era y de estar cerca de una ciudad densa logré vislumbrar el manchón verde del cometa, ver nebulosas como orión o conjuntos estelares como las pleyades es increíble, desde que los tengo observo el cielo cada noche (si el clima se presta claro). Algo más, si quieres estos binóculares es posible que estés pensando también en un teléscopio, la realidad es que comprar estos binóculares es una excelente opción, no solo tienen el alcance y la luminosidad suficiente para competir con un telescopio de bajo costo sino que son mucho más económicos (en perspectiva, se requeriría de un telescopio de cielo profundo de al menos 4 mil a 6 mil pesos), son mucho más comodos de transportar por obvias razones y en general, a menos que quieras dedicarte de lleno a la astronomía, unos binoculares como estos son una alternativa más que excelente. Para teminar, dejé un par de fotos, la primera es como se ve con los binoculares y el adaptador para teléfono, la segunda es una toma con un teleobjetivo 300mm.