Do some brands advertise area magnification instead of linea
I went to Big 5 to try out some other brands, including a $99 Barska 10x42 and a $65 Bushnell 10-30x50. To my frustration, both only had a 3x linear magnification. At 30x, I was able to hold them steady as I looked at the sign at the back of the store. The sign was linearly magnified about 5 or 6x.
Are there any 10x50 binos that actually give a 10x linear magnification, or does 10x always mean area magnification?
I went over to an astronomy gift store on campus and asked if they had binoculars. They only had kid ones, but I had a look. The 4x ones made the chairs across the room look twice as tall. The square root of 4 is 2. I asked the astronomer about this, and he said magnification is supposed to refer to linear, and that maybe I'm not viewing things right. I think he is just used to expensive optics that don't false advertise.
Is it possible for me to get a true 10x linear magnification for under $50, and a field of view that does not look like I'm looking through a paper towel roll?
Steve at OpticsPlanet
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