Android Camera Hacking Academy

as a reference, with a 30mm diameter lens, we can adjust the distance between the camera eye and the lens at 3-5cm, not too far, (because the image will be inverted and the vignette will appear too high). the rest we can try any lens available. we can also rearrange some pieces, add a concave lens near the cellphone camera eye as an extension of the lens's focus distance (for example, we can move the focus from 5cm to 10cm, and still get the appropriate focal lenght)