Rokinon 16mm f/2.0 ED AS UMC CS Lens for Sony Alpha APS-C Mount

I have never used this lens for video; however, I am very impressed with some of my night photography of the Milky Way with this lens attached to my Canon EOS 7D Mark II. I generally don't use it for day time photography, due to the inconvenience of manual focusing only, but the pics I have taken are of exceptional quality, especially landscapes. I am very happy to have purchased this lens for my Canon.

I can't compare the two as only I have the 16mm lens. The 16mm does an adequate job with astrophotography. I've captured the milky way, meteor showers, constellations and star trails. One aspect I notice is that brighter objects in the night sky, planet and major stars for example, tend to exhibit a starburst pattern on the image. I don't know why that's happening, whether it's inherent in the lens design or something I'm not setting up correctly in my camera settings. I'm not crazy about the effect, but it's there none the less. Thus, I have some research to do. Overall, I'm satisfied with my lens.

Yes, the AE chip allows communication between lens and camera, for aperture and metering purposes.

Yes.

Yes, focus confirmation will work with the D90.

Lenses don't have crop factors, cameras do. This lens is meant for a cropped sensor or aps-c camera.

This lens is for crop sensor cameras. It will vignette on a 35mm camera.

Yes, it has the chip and electronic contacts to needed to work with the D3XXX, the D5XXX, and the D7500 cameras. The instruction manual for the Rokinon 16mm f/2.0 states: "Your Nikon mount has electronic contacts that allow it to communicate with Nikon AF cameras. These contacts enable the A, S, and P modes of the camera. When a subject is correctly in focus, the camera emits a beep or an indicator light comes on."