Today we are looking at the first commercial red dot optic, and its successors. In 1975, Aimpoint released the Aimpoint Electronic, a collimating optic using an LED as a light source. It was intended for the hunting market, where an unmagnified optic that could be used with both eyes open offered a significant improvement over traditional magnified optics for short-range moving targets. The sight proved popular, and led to a second generation in 1978 with an improved mount. In 1983, a third generation (the MkIII) was introduced. This model was zeroed by moving the collimating lens inside the optic, instead of moving the whole optic on its base as on the previous models.
In 1985 Aimpoint released their first optic that mounted in standard scope rings, the Aimpoint 2000. However, they continued to market and develop the initial family of optics as well, releasing the Aimpoint 1000 in 1987. This pattern was still very popular with hunters, and offered a lower mounting position than possible with scope rings. Ultimately the ring-style models became much more popular and the Aimpoint 1000 was the last of its type offered by the company.
For the earlier models, how available are batteries?