All pictures © Bastiaan Ekeler, used with permission.
I love hacking projects like this. They may be useless for some people but I think they are way cool.
As Bastiaan sums it up:
I designed and built a Canon EF Mount for my Game Boy Camera. The GBC has a sensor size of about 3.6mm² which seems equivalent to a 1/4″ sensor (Wikipedia). This gives the GBC a crop factor of about 10.81. With my 70-200 f4 mounted on a 1.4x extender, this gives me a max equivalent focal distance of about 200×1.4×10.81=3,026.8mm.
The lens adapter was designed in Rhinoceros 3D and printer on a Monoprice Select Mini v2 in black PLA at a pretty rough layer height (for speed). Minimal supports and cleanup are required to make the lens fit semi-snugly. The GBC sensor PCB screws into the back of the 3D print and with a little cutting and filing, the whole things mounts onto the partly-disassembled GBC, all with the original hardware. If there is enough interest, I might make some modifications to the 3D model and post it on Thingiverse for others to print and experiment with.[…]
Fun fact, this combination gives me almost the exact focal length to get the moon to fill the tiny 128×112px frame. Shooting the moon handheld with a ~3000mm equivalent lens on an unlit gameboy screen that updates at about 1fps in low light situations is not an easy task but I got a couple of shots in!
Be sure to read his article to get more insight, and check the sample photos. Kudos Bastiaan!Hackaday]