For Leupold MK4 12-40x60 spotting scope.
Some available features for the accessory ring:
1. Attaching red dot sights for quickly finding objects, especially in low light conditions.
2. Attaching lasers for pointing out targets.
3. Attaching Cosine Indicators so a spotter can see the angle to the target.
4. Attaching IR illuminators to identify and illuminate targets.
5. Attaching a rangefinder increase the accuracy when aiming the rangefinder.