Viewing optic with round counter system

1. A system comprising:

(i) a viewing optic comprising a main tube, an objective system coupled to a first end of the main tube and an ocular system coupled to a second end of the main tube, an erector lens system disposed between the objective system and the ocular system, a first focal plane located between the objective system and the erector lens system, and an active display configured to generate a digital image, and

(ii) a firearm having a round counter configured to track ammunition status and to communicate ammunition status to the active display; wherein the ammunition status is projected into the first focal plane of the viewing optic, and further wherein the round counter comprises a magazine follower with one or more magnets.

2. The system of claim 1 , wherein the firearm comprises one or more magnetic sensors.

3. The system of claim 2 , wherein the one or more magnetic sensors are Hall-effect sensors configured to detect a magnetic field from the one or more magnets in the magazine follower.

4. The system of claim 3 , wherein the one or more Hall-effect sensors are in a magazine well.

5. The system of claim 3 , wherein the one or more Hall-effect sensors are on a receiver of the firearm.

6. The system of claim 3 , further comprising a processor to correlate position of the magnetic field with ammunition status.

7. The system of claim 6 , wherein the ammunition status is number of rounds of ammunition in a magazine.

8. A system comprising:

(i) a viewing optic having: (a) a main tube; (b) an objective system coupled to a first end of the main tube that focuses a target image from an outward scene; (c) an ocular system coupled to the second end of the main tube, (d) an erector lens system located between the objective system and the ocular system, (e) a first focal plane located between the objective system and the erector lens system; and (f) an active display configured to generate a digital image; and

(ii) a firearm having a round counter comprising a magazine follower having one or more magnets, and configured to be inserted into a magazine and multiple magnetic sensors placed on a magazine well, wherein an activated magnetic sensor corresponds to a position of the magazine follower, which correlates with ammunition status, wherein the ammunition status is projected into the first focal plane of the viewing optic.

9. The system of claim 8 , wherein the magnetic sensors are Hall-effect sensors.

10. The system of claim 8 , wherein the magnetic sensors on the magazine well are located in a remote control configured to communicate with the viewing optic.

11. The system of claim 8 , wherein the ammunition status indicates number of rounds of ammunition in the magazine or indicates a round of ammunition in a chamber of the firearm or indicates a round of ammunition in the magazine or an empty chamber of the firearm.

12. The system of claim 8 , wherein the ammunition status is the number of rounds of ammunition remaining in the magazine.

13. A method comprising:

(a) moving a magazine follower with one or more magnets through a magazine;

(b) activating a magnetic sensor when the magazine follower is in proximity to said magnetic sensor;

(c) determining ammunition status based on position of the magazine follower as indicated by an activated magnetic sensor;

(d) communicating the ammunition status to an active display in a viewing optic, wherein the viewing optic has an objective system coupled to a first end of a main tube and an ocular system coupled to a second end of the main tube, an erector lens system disposed between the objective system and the ocular system, and a first focal plane located between the objective system and the erector lens system;

(e) generating a digital image of the ammunition status using the active display; and

(f) projecting the digital image into the first focal plane of the viewing optic.

14. The method of claim 13 , wherein the magnetic sensor is located in a magazine well.

15. The method of claim 13 , wherein the magnetic sensor is located on a remote control configured to communicate with the viewing optic.

16. The method of claim 13 , wherein the magnetic sensor is a Hall-effect sensor.

17. The method of claim 13 , wherein the ammunition status indicates number of rounds of ammunition in the magazine or indicates a round of ammunition in a chamber of a firearm or indicates a round of ammunition in the magazine or an empty chamber of a firearm.

18. The method of claim 13 , wherein the ammunition status is the number of rounds of ammunition in the magazine.