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Holographic sights and red dot sights are highly similar, however, holographic sights such as the 512.A65/1 use holograms, hence the name. Holographic sights use a laser, which is reflected off multiple adjustable mirrors, and through to the user's eye. One downside of such technology is batteries. Because holographic sights rely on lasers to function, and not LEDs, it takes more battery power to operate, however modern updates to these devices provide for very long battery life cycles.
These sights have become popular due to the nature of the sight aperture. When looking through the sight, the reticule appears to be projected 30-40 feet in front of the shooter. The HWS and "high end" Red-Dot sights are "Parallax Free" optical devices, this means that the exact position of the user's head/eye(s) relative to the optic device does not effect the accuracy of the reticule with respect to the bullet's point of impact. In addition, the EOTech HWS series works despite damage being done to the glass "lens" or obscurement of the "lens" by mud/blood etc, as long as some portion of the glass can be seen through the reticule can still be seen and its accuracy is not reduced. This is in contrast to "rifle scopes" where damage to the glass or obscurement by foreign material can render the optic useless.
Both Red-Dots and HWS sight systems are often used in Close Quarters Battle (CQB) conditions with both of the shooter's eyes open. In this usage, the human brain integrates the holographic image or red dot seen by one eye with the scene viewed by the other eye creating a wide angle sight picture with excellent peripheral vision as well as a pinpoint accurate reticule super-imposed on the image.
In the field, both HWS and Red-Dots are often augmented with image magnification add-ons. These optional add-on devices are often deployed as a secondary optic device positioned directly behind the main optic in a "Flip to Side" configuration where the magnifier can be "flipped out of the way" for non magnified use.
Newer HWS models have introduced "Ballistic Reticules" which contain additional aiming dots that correspond to aim points for different distances to compensate for "bullet drop" at farther ranges.
They always leave the best 'till last -- Have understanding, no questions asked -- You find yourself in what you see -- You found yourself in me....
-- YOU FOUND YOURSELF --