Binocular/Spot Scope Measurements

[GREENGUN]

Just confused as to how you can rate these items. 10x42 or 12x52 etc.

What do the numbers mean exactly? How do you judge power and range? What are good brands? Any other important things to know?

[Redfrog]

First number is magnification, second number is measurement in mm of objective lens.
Try some out. You get what you pay for. Buy once cry once,

[GREENGUN]

OK the first number I understand but could you explain the second in more detail because it went right over my head...

[Redfrog]

The second number is the measurement of the front lens, the objective lens, in mm. It is the diameter .

Very simply, the larger the number, the more light is let in. This works up to a point. An obj lens of 50 mm lets in all the light the human eye can process as a rule. There are other factors as well such as the ratio of magnification to the size of the OBJ. lens.

Check this site out

http://www.opticsplanet.net/what-is-...ing-scope.html



Google is our friend

[CalgaryDave_]

google and intraweb is your friend:

http://www.binoculars101.com/bin-design-name.html

http://www.opticsplanet.net/how-to-buy-binoculars.html

*Edit* haha....Redfrog is a faster typer. GMTA.

[GREENGUN]

Awesome, I understand now. Lastly, what magnification would be appropriate for say 500 yards and 1000 yards?

[Redfrog]

My spotting scope is old. it has a 16-36 variable magnification and has served me well.

[wwbirds]

For 500 to 1000 yards you don't need a spotting scope as good quality binos will be fine. Remember the higher the magnification the more exagerated any movement willl be so 8X40 work well. 10X40 will show more movement and 12 power will really be hard to hold steady without a firm rest. that is generally why spotting scopes require a tripod or window mount to hold the glass steady.