As you may recall, my beloved Gakken World Eye shit the bed during a power failure a couple weeks ago, after having been on 24/7 for nine years. Since these are going for almost a thousand dollars on eBay, my first attempt was to buy the cheapest desktop video projector I could find (HY300 Pro, $30) but that projector threw too small an image, and couldn't focus closer than about 2½ feet.
So then I ordered the cheapest fisheye camera lens I could find (49mm wide angle macro, $30) whose smaller lens was just slightly larger than the output lens of the projector. Success! It worked the first time.
(Someone who knew what they were doing might have looked at the focal length and done math to determine what kind of lens was needed. I very much did not do that. But I got lucky!)
I enlarged the various holes to make the new lens fit inside the dome, and got an 82mm to 95mm step-up adapter ring to screw onto the front of the fisheye, to have something I could drill into to hold it in place inside the dome. Then I cut the old electronics housing in half and dremeled out all of the interior greeblies to have a sleeve to slip over the new projector. The rest is duct tape.
I had to open up the new projector to extend the IR receiver into the dome, since, like the old eyeball, it doesn't remember its settings and you have to manually select HDMI on a remote after a power failure.
The image is 16:9 and doesn't fill the whole dome, and it's a little fuzzy on the edges, but for eyeball purposes, it's close enough. Once I get an ethernet cable in there, I'm going to see what tweaks I can make on the image in software to make it fill the frame a little better.
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