Bought me a set of mini Iphone lenses on Ebay, cost less then 10€. Since the viewing angle of the Raspberry Pi camera is pretty narrow I decided to try out a wide angle lens. My camera board is fitted to a pan/tilt kit on my Service droid robot. The narrow viewing angle makes it hard to accurately remote control the robot. I couldn’t resist the Iphone lenses when I saw how cheap they are. To fit them to an Iphone you have to stick a metal ring around the camera. The lens has a magnetic edge to make it stick to the ring. I was a bit worried if I would succeed in attaching it to the Raspberry Pi camera board but in the end it was quite easy.
I used a small piece of polystyrene plate and cut it to approximately the size of the Raspberry Pi camera board. I then drilled 3 holes in it. Two 2mm holes in the edge of the plate and 1 big 8mm hole in the middle. I used M2 nuts and bolts to fit the plate to the camera board. I then stuck the ring to the plate and fitted it to the camera board.
Then I could fit the mini lens to the ring
The difference is not that big and the photos and videos made with the lens are not as sharp. But still it was worth the trouble. Here are 2 photos made with the camera board without and with the lens fitted:
Without the lens fitted:
With the lens fitted: