I have the same DS-2CD2387G2-LU 4K 4mm version of the G2 Colorvu and it has focus issues.
I am a professional photographer. I stumbled on this thread wondering how to focus a fixed focal length Colorvu camera.
There are posts on this forum from
venturis and
triumph202 breaking open the camera and focusing the lens due to the same focus issues.
I recently purchased a 2CD2387G2 8MP ColorVu to replace a 2386G2 monitoring the driveway and front yard of my home. After conducting some side-by-side testing with the existing 2CD2386G2 I came to the conclusion the new 2CD2387G2 was not as well focused. Images from the 2CD2387G2 were...
ipcamtalk.com
I tried default hikvision settings as well as changes to bitate/codecs and increasing sharpness. Nothing fixes the out of focus issues.
Increasing the sharpness to 80 helps a little. Beyond that it overshapens a blurry image creating jagged edges.
Attached are 2 photos of me standing still in daylight at 5m and 10m from the camera. Sharpness is set at 80 (default is 50).
Codec was H265, variable bitate, highest quality, bitrate 6144 (default), 15fps, iframe 30, smoothing 50 (default)
The minimum focal length for the 4mm lens is supposed to be 3.6m to infinity.
You can see the area in focus is the garden on the front left of the picture between 3-5m from the lens. The mailbox is 5m.
However the left side of the image goes out of focus beyond 5m.
The right side of the picture where I am standing at 5m is out of focus as is everything in the background.
The only thing in sharp focus is the time/date stamp overlay in the bottom right corner.
I have had the camera a few weeks and am will attempt to return it for another one (hopefully properly focused in the factory).