From what I know, the adjustible objective will sharpen the parallax at certain distances. I messed with mine a little today but didnt notice any diff.. but I was only shooting 100yds. Not usually needed cept for long range shooting but I know that glen, hff or others can provide a better explanation than I can.. I'm all ears!op:
it alows you to set the focus plane to what ever distance you are shooting at therefore eliminating paralex. ever sit in the passenger side of a car and look at the speedometer (not a digital type) and you will read it at a diff speed that you would if you where in the drivers seat looking straight on to it? that's an example of paralex. for most critter wacking especialy deer it just isn't a problem but for competitive target shooting or shooting tiny critters out there a ways it can make a world of differance between hits and misses. by the way as long as you look through the scope exactly centered on the eye piece every time you will never experiance paralex. but if your scope was focused for lets say 100 yds and you where shooting at 25 yds if you where to move your head up and down a tad or left and right you would experiance the crosshairs apearing to move on ya. anyway it alows you to focus the scope for a given distance, most fixed centerfire rifle scopes are pre set at 100 yds. most rimfire rifle scopes are set to 50 yds. a adjustable optic would allow you to go down to as little as 10 yds and out to infinity. hope that helps.
It is a good way to get a better sence of the distance your target is at, when the crosshairs are in focus with the target you are shooting at, look at the range on the scope and that is where your target is.
yes, john is right you can use it for a make shift range finder. one more thing when you go to adjust your AO to focus in your target. always adjust it with your power setting to it's highest max. setting. then turn down the power setting (like go from 9x to say 5x) to where you want it for those shots. if you focus it at a 3x setting then zoom in to 9x with out adjusting the AO you may verywell notice that it isn't as sharp. reason being is you can focus it more precisely at the higher setting. it really won't affect it to where you would really notice uless you are target shooting for score and then only maybe. now all that being said when you're out hunting deer with that rascle don't fumble with the dang AO before you shoot. just use it like a regular fixed scope and shoot. dang deer would probably walk away before you got it all set just right. :bangin: for deer season i leave mine set at 100 yds.
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