If you really want HD for sketches and tests, then borrow an XH-A1 (or similar)
and project the film onto a piece of matte board (more smooth and even than a
wall) getting the camera as close to the projector as possible to minimize
parallax. The results can be surprisingly good. Probably best to use manual
iris bracket exposures, and do a few takes.
If you want high quality stills, try to borrow an analytic projector, or some
other model with a pause function that will project a still frame without
burning up the film. Then shoot that with a DSLR. There's more detail in 16mm
than any HD transfer can capture.
Unless it's footage you know you want to use for a serious project / finished
product paying for a good frame-by-frams scan isn't cost effective.
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