The above are photos from the OPSIN 2 (by means of base line comparison) relative to the Hikmicro ALPEX 4K A50EL (digital rifle scope) - conditions were as follows, 75 minutes after sunset and 15 minutes after nautical dusk. Drizzle and cloud cover were present as was skyglow reflected off the clouds from a town about 15km away.
The detector (in the ALPEX) appears to have a 2 micron pixel pitch and has good/solid quantum efficiency well into the IR spectrum responding well to 940 IR. In terms of magnification it runs out to 28x (8 x digital from base of 3.5).
In built LRF and ballistic calculator that shows point of impact solution in the scope, plus one shot zero - overall a surprisingly decent package.
As a rule I prefer a decent quality first focal plane day scope, plus thermal spotter and thermal scope - however, this device squares a few circles and is surprisingly good beyond dusk (in IR mode). At the end of the day its still a digital camera with the IR filter removed and thus for night use does have real limitations, however it does go to show that with a large lens plus large detector (3840 x 2160) and in effect a bit of a brute force approach (from a tech perspective) this can be made to work surprisingly well.
PS Illuminators were not used and images were taken within a few minutes of each other.