Arducam M12 Lens Kit for Raspberry Pi HQ Camera (Type 1/2.3), 20 to 180 Degrees Telephoto, Wide Angle, Fisheye Lenses with M12 to CS-Mount Adapter, Locking Ring, Cleaning Cloth and More

A pretty good set, wide range of focal lengths plus some neat-o adapters. However despite what the Amazon description implies, all but one (the 25mm) have a built-in IR filter. If you intend security/surveillance uses then this is a big problem. IF YOU ARE VERY CAREFUL the IR filters CAN be removed, ok destroyed. They are at the very back, barely a millimeter above the final lens element, and fixed-in pretty good. Suggest using the smallest pointiest 'precision screwdriver' you have as a punch. Tap, very very carefully, at the extreme edge of the filter. It is ultra thin so it'll crack. Then work out the little fragments. Messed up the first one, wasn't gentle enough. I'll suggest a 40 degree outwards angle at the very edge of the filter. Note it is difficult to search for/find lenses without the IR filters even on Amazon. The 'CS'-'M12' adapters are a nice addition and there's even a square thing like I've used to adapt cheaper HP webcams to M12 lenses (gotta tear-up the HP and glue-on the lens carrier). The low-end HPs, 600 series, older ones anyhow, do not have an inherent IR filter. New/expensive ones it's like a permanent coating over the sensor. Combined these lenses with 'ArduCams' which ALSO have an IR filter but you can pry that away with an Xacto knife - again CAREFULLY. "Spinel" made a boxed series without IR filters, but now you can only buy the bare boards.

Using these with AIDA NDI cameras in a theatre for backstage viewing. The picture quality is excellent (I can't tell the difference between this and the branded lenses which I own) and they're forgiving on light. Perfect variety pack for my purposes and I'll always have the right lens for the job.

Setting up a yoga studio for virtual classes - these were a really useful kit for multiple cameras placed around the room. Much less expensive than individual lenses from AIDA, a nice selection of lens sizes. The 4mm lenses supplied with the camera create a distinctive fish-eye effect - these are solid. Great find!