Re: opti-logic rangefinders
1. distance. it's dependent on the "quality" of the target. there's no clear-cut answer and it's difficult for us manufacturers to put an actual number on it-that's why it's always vague and nebulus (sp?). The IR beam of all consumer grade rangefinders, diverges as it leaves the rangefinder (sorry to get techie on you). if the targeted object is large (say deer size) a 600 yard rangefinder "should" be able to hit it at about 400 yards or so. it's reflectance is high enough to get energy back to the rangefinder. but since the fur is diffusing the IR light, it might not reflect enough light. a black bear-albeiit larger-probably would not under the same conditions. a 1000 yard rangefinder may do better but again, it's dependent on the target and the amount of light reflecting off that target.
As far as Opti-Logic Corp products go, they are not back illuminated, nor are they magnified or "thru the lens". the reason is: better viewing functionality. Yes we realize that it is a bit less desireable to take the unit away from your face to see data, when you range something. but since we're not thru the lens nor magnifed, you'll see the target much better in subdued light. our system is a red dot concept. you press the fire button, put the red dot on the target, release the button and it fires (so to speak). the clarity and visibility is superior to those that have thru the lens targeting since we don't have all the interference of optics.
I hope that answered your questons. i'll be happy to try to answer others if you have them.
let me also mention at this point, we are the ONLY manufacturer that puts tilt compensation in our consumer rangefinders. this feature (XT and LH models)give a display of the HORIZONTAL distance, not just the "line of sight" distance that all others give. It very suitable for Archers and Riflemen alike. remember: all your sights and scopes are calibrated on the horizontal. shoot up hill or down hill and horizontal distance measurements will give you corrected information. [img]images/icons/smile.gif[/img]