I have some lenses from an old projection television, but in every configuration they had focal lengths way too short for my D3400. I've been experimenting with one of the small lenses from
>>3271139 and it seems I've found a combination that works. I'll be doing more testing later on to see if I can come up with an easy way to put things together.
Here's a test vid. I had a small temp rig set up to see how it was framed for an APS-C sensor. This uses 3 lenses without an aperture so there's a good bit of haziness from spherical aberration.