Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Is this a fixed lens or a zoom?
Document: I watched him as he opened them and checked them out the first thing he asked was do they have any higher magnification models. I replied &#34;zoom in on the top of the mountian&#34; (which is easily 2 miles away) His response... &#34;Thats pretty clear huh?&#34;.... Priceless.
Best pair I've ever owned, really well constructed. You will never lose the lens caps as they are fastened to the binoculars.
They are a great improvement over my non ED glasses. I like the attached lens covers and the price was great. A wonderful purchase!
This is our first binocular. We took this on our recent trip and have been very happy. Its very bright and the reach is good.When I opened it at home, i was not able to focus it properly, so had to read the instructions. If you dont wear glasses you have to screw the view lens up. And if you wear glasses (or sunglasses), then it should be all the way in.Its a great binocular!
Both center focus knobs have a smooth rotation, but the Vanguard just has a better feel to it.Advantage: Vanguard.Objective Lens Protective Covers:Both binoculars have protective covers over the objective lens, and both sets of covers are designed to stay attached to the binoculars when you&#8217;re using them, to avoid losing the covers. The Vanguard protective covers stay firmly attached to the body of the binocular and there is almost no danger of losing them.
Advantage - Bushnell.Lens covers -- The lens covers for the eyepiece lenses are virtually identical. Those for the objective lenses are different in that the Bushnells have a relatively loose retainer ring, while the Vanguards have a tight retainer ring. Several reviewers mentioned the looseness of the Bushnell objective lens covers (particularly when open, hanging from their retainer rings), and one went so far as to hot-glue the retainers in place.
This tightens the ring, and gives a long distance that the ring must move before it could fall off. What I like best about the Bushnell objective lens covers is the tab that makes finding and opening the cover very easy, even with gloves on. Advantage - Bushnell.As you can see from this listing of features, the Vanguard Endeavor ED 8x42 and the Bushnell 10x42 Legend Ultra HD are close to equal. Each is available in both 10 and 8 power versions.
If you a hunter and your thinking of investing in some binos I highly recommend these. You can zoom in on a bird at ten yards and watch it blink and two seconds later be counting the blooms on a cactus 500+ yards away. The best part is they are super light I couldn't tell you the exact weight but I would have no problem wearing them on a binostrap all day. They had a promotion for $50 dollars off for the month of June.
I own both the Vanguard Endeavor ED 10x42 and the Bushnell Legend Ultra HD 10x42, and am able to provide a direct comparison between these two very similar binoculars.Similarities:The Vanguard and Bushnell both have 10x magnification and 42mm objective lens. Both use ED (Extra low-Dispersion) glass, have a magnesium alloy body, use BaK4 Roof Prism system, are fog-proof and waterproof, and both have a Field of View of 340-feet at 1000 yards.
These are really nice!!! I had read all of the reviews and felt comfortable buying them. As soon as the got in I took them out to the national wildlife park and was fortunate enough to jump three mule deer about 30 minutes into my hike. The zoom works fantastic. I was zoned in on what I assumed was a single doe and after a few seconds with the binos I noticed the other two not three yards away from the first.
Answer: Fixed at 10x, not 40. Here at Optics4Birding, we do not recommend zoom binoculars because they are, of necessity, low quality. The hardest thing to do in zoom binocular is to get the magnification the same in both eyes. Mismatched magnification can lead to eyestrain and headaches. The only way to ameliorate this is to use low quality optics that are not sharp enough for the mismatch to be detectable.