Why is the front objective lens angled?

The angled objective lens is part of the design.  All red dot sights have to have a bit of an angle on the objective to allow for the light from the LED emitter to bounce off the inside surface and be reflected to the shooter.

The Holosun design is a bit steeper than many and this allows for the emitter to have an extremely low profile so that it does not intrude into the inside of the tube and obstruct your view.   The angle also reduces reflection to your target.

Why is my front lens off-axis?

Red Dot Lens Positioning: All red dot sights have an objective lens at the front of the unit that is spherical in shape. However, unlike a conventional riflescope, the objective lens in a red dot sight is positioned off axis and appears to be tilted when looking at the sight. This angle of the front lens allows the light generated by the battery powered LED light source inside the unit to be reflected back into the sight. The reflected light becomes the “dot” or aiming reference that the user sees when a red dot sight is switched on. This engineered “bending” of light is what makes today’s red-dot sights so popular and easy to use. Adhesive is used on the inside of the sight to secure the LED to the inside of the tube. By design, the led package intrudes slightly on the field of view.


How do I adjust the auto sleep mode? (Shake Awake)

Certain recent production sights have an updated motion sensor and new options for the auto sleep mode.

The default sleep timer setting is 10 min, but can be adjusted
1) Press and hold the “+” button for 10 seconds to enter time adjustment mode. There are 4 options: 10 min, 1h, 12h or the sleep mode is disabled.
2) Press and release either “+” or “-” button to set the time. The LED will blink (1=10 min,2=1h, 3=12h, or4=disable sleep mode.
3) Press the “+” and “-” buttons simultaneously to save the time setting and power off the sight

Recommended zeroing distances?

Most people tend to zero somewhere between 25 and 100 yards. This is really a matter of preference and it is often best to consider what your philosophy of use for the firearm is when you decide on a zeroing distance. For example, someone interested in self defense, might zero at 50 yards or less, while someone looking to do short and long distance range shooting might zero at 100 yards. Seek the advice of a qualified firearms instructor to best understand what zeroing distance is best for you.

My new HS510C isn't working

If you have purchased a new HS510C and you are seeing symptoms such as the the reticle not turning on, blinking, or other odd behaviour, there is a simple solution.   

The HS510C contains a super capacitor.   It allows the sight to function even in the dark for several hours without a battery.   If the sight has been stored without a battery for a period of time, the super capacitor can become discharged.   Please place the HS510C in sunlight or bright artificial light for a couple of hours.    This should address the issue.