It actually has more to do with resolution I think and it can be measured. I do know that scopes with better optics are more pleasant to use. I have owned scopes from 30 dollars to 400 dollars and the more you spend on good optics it does make a difference.

Can a cheaper scope work, sure it can if it works in the conditions you use it for. At least spend enough money to get a scope with good coatings on all the lenses. How clear or bright a scope is doesn't matter if you pull it up on a wet snowy day and the lens fogs over while your aiming. Been there done that.

Don't buy into the big objective giving you more light either. Better coatings and glass are always better than a huge objective.

A clearer scope is also better on the eyes, especially when using one at longer distances for longer periods of time like target shooting or varmint hunting.

I tried about 4 scopes on my 17 HMR before I found one I liked. Ranging from 100 dollar BSA's up to a 400 dollar Cabela's brand (A nikon I think). You could deffinately tell the difference in the scopes as you moved up in price, especially at longer distances and higher powers.

Go to a good shop and pick two scopes of the same power and simular size. One being a lower priced tasco or bushnell in say 3-9 or 10 power with a 40mm objective. Then look through a more expensive scope like Zies conquest or something in the same size. If you can't tell a difference in resolution, color and brightness you should have your eyes checked.

You can do the same thing with binocs, look through some cheap walmart tascos and then through a high dollar pair. It's like night and day.

Does that mean you have to spend a fortune on a scope to get a servicable one to hunt with? Nope, not at all. However it doesn't mean the more expensive are not any better, because they are.

Paul