I purchased this camera to test it for use as a sensitive occultation astronomy video camera system.
How did it work? The RunCam OWL Plus is nearly as sensitive as the WAT910HX -- a standard for high sensitivity and linear response. The response is not linear, but it is close enough to a standard 0.45 gamma response that the camera can be used for accurate photometric measurements.
The AGC does not seem to work as a normal 'automatic' gain control. Instead, AGC has 4 possible global 'gain' settings within which the camera then has a degree of automatic gain control. For maximum sensitivity, AGC-High should be used. All other settings have less sensitivity.
Contrast setting should be left at the factory setting. Trying to increase contrast only serves to increase the brightness of the low-luminance pixels and to compress the brightness of the high-luminance pixels. There is no net improvement in sensitivity by changing the contrast.
The sensor chip is a CMOS design, interfaced with an NTSC/EIA video generator chip. The system works well, however, the CMOS design results in a rolling shutter. For the timing of astronomical events, the rolling shutter poses the additional problem of having to correct for the position of the star on the chip when applying times to measured events.
The RunCam OWL Plus comes with a very handy OSD controller. This works as well as any OSD controller that I have seen provided with any other NTSD/EIA CCD video camera. The menu is very intuitive and very complete. The large number of features available outnumber the number of features that need to be used in occultation astronomy, however the FPV fraternity will find them all very handy and easy to program.
I purchased the camera with the 'orange' case. Being an Oregon State University alum, orange and black seemed like the perfect camera color combination. Unfortunately, it was found that the orange case is very translucent to light and when applied in a nighttime application like occultation astronomy, the camera is sensitive to outside lights such as flash lights, head light glare, street lights, etc. The black case may be a better solution for occultation astronomy. In the meantime, covering the case with opaque rubber tape will have to do.
The camera was tested for linearity and found to have very good gamma 0.45 response. The camera was tested for sensitivity to small 0.2 magnitude changes in brightness. The camera was able to detect more than 2.5 magnitudes of brightness change with a very acceptable response, with corresponding response steps varying from 0.2 to 0.3 magnitudes, and very good signal-to-noise ratio even after 2.5 magnitude change in overall brightness.
The camera lens supplied is quite nice, but to couple the camera to a telescope an M12-to-CMount adapter must be purchased at a cost of around $10. This allows the camera to be attached to a CMount-1" 1/4 adapter that allows the camera to fit a standard eyepiece mounting socket.
The camera does not run too hot when powered at 12V. It will run cooler when powered at lower voltage. The voltage regulator seemed to work well and is supposed to accept a wide range of input DC voltage.
The RunCam OWL Plus is a much better camera than the RunCam OWL, particularly at low light. At low light the RunCam OWL limits the dynamic range of brightness to less than 1/2 of the full scale 256 bit available in the NTSC/EIA standard video signal. Presumably, this is part of the anti-bloom circuitry of the camera. Unfortunately, it makes everything appear nearly equal in brightness, once the saturation brightness of the camera is reached. The RunCam OWL Plus uses more dynamic range of the camera -- at least 90 percent -- before the anti-bloom circuitry kicks in. Therefore, it allows a greater range of brightness at night between the brightest and faintest objects.
The cost of the RunCam OWL Plus is reasonable. At a high cost, many other cameras would be competitive in price and features. However, at the current price point, the RunCam OWL Plus is the best camera of its type on the market.
I intend to recommend this camera to the astronomical community as a very good low-cost entry-level camera for occultation astronomy.