What is the difference between the Signature and Fullfield scopes ?
The difference in the two scopes is that the Signature Series Scope utilizes internal lenses that are 40% greater in surface area than those used in our Fullfield Scopes . The larger lens surface area allows more light to pass through the scope tube, to your eye . The Signature Series lenses are also polished a bit differently to enhance image clarity . The overall lens system designs are more exacting through more precise computer-aided designs . 4x magnification change is available in Signature series scopes ie:, Fullfield 4x - 12x and 4x -16x Signature . Several of the Signature series scopes also feature the Light Collector . All other internal components are common to our entire line of scopes.
What are the differences between rimfire / airgun scopes and centerfire rifle scopes ?
Airgun recoil is caused by springs and pistons moving with a tremendous force . This type of recoil can be more abusive to a scope than the heaviest of magnum recoil . All Burris scopes are engineered and constructed to withstand the severe recoil of the highest velocity airguns . The difference between the two styles of Burris scopes is the R / A scopeís ability to focus at closer ranges.
Burris produces four different R / A scopes . The Burris 4x, 6x, and the 8x-32x R / A scopes have parallax adjustment from 10 yards to 100 yards . The 3x-9x and 4x-12x R / A scope has parallax adjustment from infinity.
At what yardage is my Burris scope set to be parallax free ?
All non-parallax adjustable Burris scopes are set to be free of parallax error at 100 yards.
What is parallax ?
Parallax is a condition that exists when either the reticle or the image is not focused precisely together . This can create the effect of the crosshair appearing to move when you move your head side to side or up and down.
How can I tell if I have a parallax problem ?
From a solid rested position, such as a benchrest, line your scope up on a target as if aiming to fire a round . Remember to keep the scope in a solid position . Carefully note the position of the crosshairs . Move your head up, down, and side to side . Should you see the crosshairs move off target, while moving your head, you have parallax . Unless you position your eye in exactly the same location from shot to shot, you can experience sligh point - of - impact shift and larger group sizes .
Should I be concerned about parallax and why ?
There are two separate lines of thought in regard to parallax due to the small variations in values . One is the line of thought from the big game hunting standpoint and the other is from the target shooting and varmint hunting standpoint . In big game hunting situations, where intended targets are larger and yardages are not excessive, minimal parallax is not a concern . In target shooting, when attempting to place one bullet on top of another and in varmint hunting situations, a shooter has need for concern . When using the high powered scopes associated with these types of shooting disciplines, parallax error can decrease accuracy . The amount of accuracy loss can be directly tied to the amount of parallax error that exists
What is the range estimator feature and how does it work ?
The range estimator works in conjunction with the subtension of our standard plex reticle . This subtension is used to measure a 18 inch target . From the intersection of the crosshairs to the tip of any of the heavy posts subtends ( measures ) 18 inches . The average deer measures about 18 inches from the backbone to the brisket, directly behind the shoulder . Bracket the deer between the intersecting crosshairs and the tip of the up or down heavy post by turning the power ring . Once the deer is bracketed refer to the yardage markings on the rear of the power ring . Note the yardage indicated, figure your hold over, aim and fire.
What is the Light Collector feature and how does it work ?
Our patented Light Collector feature allows the shooter to fine tune the image brightness, resolution and contrast according to light conditions, much like the f-stop control on fine cameras . The Light Collector is adjusted with a ring marked daylight and twilight, located behind the adjustable parallax ring .
When turning the Light Collector adjustment ring towards the daylight setting, a multiple leaf iris folds down into the light path . This folding iris cuts down the amount of light that passes through the objective lens . When turning the adjustment ring back towards the twilight setting, the iris folds up, out of the light path and allows all the light to pass through the tube, to your eye . The adjustment ring can be set anywhere between the daylight and twilight settings, according to the existing lighting conditions.
What is the proper method to clean scope lenses ?
Do not use any type of glass or flat surface cleaner ! DO NOT use finger nail polish remover or windex ! These types of cleaners have been known to remove the multi coatings on scope lenses . Burris recommends the following method which is used by our factory technicians .
- Purchase a bottle of acetone . Acetone can be purchased at any full service drug store .
- Remove dust or debris by using forced air or a soft brush .
- Take a cotton swab and dip into the acetone . Starting in the middle of the dust free lens with the damp swab, move the swab in a circular motion working your way to the outside edge of the lens . As swab dries, discard it and continue with a fresh damp swab . Repeat the use of damp swabs until the lens surface is clean . Note: Without acetone, it is amazing how plain water and a clean lint free cloth works.
Should you discover that the scope has debris on the internal surfaces of the of the lenses do not attempt to disassemble the unit . Disassembly or attempting same, will ruin the air tight seal of the unit . In removing the eyepiece you run the high risk of breaking the reticle ( crosshairs ) . Removing the eyepiece from the rear of the scope is not recommended . Unauthorized disassembly may void your warranty . Should the internal lenses show debris, please return your scope to Burris for repair.
How do I focus the reticle to my eye ?
Follow these simple steps .
- Loosen the eyepiece lock ring ( except on Fullfield II, Black Diamond and Electro-Dot scopes which have no lock ring) .
- Rotate the eyepiece counter clockwise five turns . ( On Fullfield II, Black Diamond and Electro-Dot scopes, rotate the knurled ring portion of the eyepiece ) .
- Look Through the scope toward the sky, or at a white wall about 10 feet away . Rotate the eyepiece clockwise until the reticle appears sharp and black at a quick glance . Do not look through the scope as you turn the eyepiece, as your eye will adjust to the out-of-focus condition . Glancing through the scope will immediately reveal the reticle as distinctive and black when it is properly focused .
- Lock the eyepiece in place by tightening the lock ring . ( No lock ring is necessary on Fullfield II, Black Diamond and Electro-Dot scopes )
I had to remove the scope from my rifle . How do I return the elevation and windage adjustments to optical center of the scope ?
- Take a coin and turn the elevation adjustment in the direction of the arrow, all the way to where the adjustment no longer turns .
- Turn the elevation adjustment in the reverse direction . Counting each click as the adjustment is turned .
- When the adjustment comes to a stop, divide the number of clicks by two . As an example, there are 200 ( this figure differs from model to model ) clicks in the total up and down movement of the elevation adjustment . Divide 200 by 2, which equals 100 .
- Move the adjustment back in the direction of the arrow and move the adjustment the prescribed number of clicks . Follow the same steps for the windage adjustment .
- After adjusting windage, repeat the procedure again for the elevation knob .
- Do each adjustment separately . Do not attempt to adjust both elevation and windage at the same time . It will not work.