Arducam M12 Lens Kit for Raspberry Pi HQ Camera with M12 Adapter

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.