Can Generation 1 be useful?
A. Yes, Generation 1 can be useful in most nighttime situations. Newer Generation 1 devices do offer increased performance from there older predecessors. Generation 1 units typically use an S-20 photocathode and electrostatic inversion to achieve gain. They can offer substantial resolution toward the center of the image tube, while the edges may be blurred. Generation 1 devices are usually inexpensive and can be a good start for the night vision enthusiast.
