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Seller sell lens as 4mm focal length, but in description there is viewing angle data for 3mm lens and my measurement and these web site show 3mm. I want 10$ money back, because I'm searching for good starlight lens from 4 to 6mm and realy don't need 3mm lens. Seller reject my request because...

These lens is exellent for starlight. My calculation show, that focal length is 3, not 4mm. I use 2 method, pure geometric calculation knowing dimension of 1/3 sensor (IMX225 is 4.8 wide, width of the target area 380cm at distance 234cm), and with these web page Lens Focal Length Calculator...

I want to build birdwatching camera. I have zoom lens from old video camera with focal length 10 to 120mm. My idea is to use cheap Chinese WiFi camera module and lithium battery pack. Is it possible to connect those module to Android directly, without router. Camera as AP or WiFi direct? AP will...

I need good long distance lens for 1M pixel 1/3" board camera. I doubt, that 50mm lens for 20 to 30€ could gave me a sharp picture and it could be better to get 25mm lens for 10 to 20€ and have equal details and less need for camera movement. It would be nice, to have big aperture. What do you...

My idea is to put together a great starlight camera that will operate at night with minimal white LED lighting. So I need as much of your experience, especially with a lens with IR filter and a big aperture. Personally I need a camera that will cover a square area of my front yard, so I'm...