Help on a scope

6-18 is the magnification of the scope, and 50mm is the size of the objective. ie the front lens of the scope. It will work just fine for 300m!
 
Yes you are right, the higher the magnification the better you can see at longer distances.

The bigger the objective the better it collects light. So if its darker out a larger objective will make it easier to see, than a smaller one like a 30mm.
 
Thanks for the reply......so.. it does not matter if the lens is 40,50 or 60 + ,it depends on the magnification numbers ?:)

Well, not exactly. The magnification range will tell you how much it'll magnify. The objective lens measurement will tell you (relative to an equal lens of a different size) how much light it'll transmit. Now, at lower magnifications, the exit pupil of the scope may (in this case, will) be larger than the pupil of your eye, (unless you're an elephant or blue whale. You're not an elephant or blue whale, are you??) so it doesn't really make a difference, but at higher magnifications, the image will be brighter, the larger the objective.

A lot of people say that this only makes a difference in low light. I believe that it also makes a difference in the middle of the day, when the sun is shining and it's a whole lot easier to look at a bright image in a scope than try to peer at something that appears to be in a dark tunnel.
 
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