As I was not totally satisfied with the image quality of the magnetic clip-on macro lens I have for my iPhone, I decided to explore the potential of stacking my smaller camera or enlarger lenses onto the iPhone for macro photography. Most of them failed to cover much of the field of view of the iPhone camera, except for the Pentax 110 50mm F2.8 lens.
Hence I decided to adapt it to mount as close to the iPhone camera as possible. To do this, I had to take off the focusing mechanism by removing the 3 small screws on the side of the lens barrel and then taking the focuser base off the lens – you will need the smallest flat-head screwdriver to remove those screws. With the focuser removed, I can then adapt the lens to mount onto the iPhone. I decided to leave the outer part of the lens on, as it allows me to continue to use the lens cap or even 37.5mm filters.
Remember the clip from the 5-in-1 lens kit I purchased previously? I decided to use my Dremel tool on the clip to widen the hole at the back until it was large enough to fit the Pentax 50mm F2.8 lens through it. It is just tight enough that the lens fits snugly and will not fall out.
With the lens mounted on my iPhone 6 plus, the focusing distance is between 52mm and 87mm which is quite a reasonable range. And as the camera is further away from the subject, it allows for more opportunity for light to get to the subject.