We hyper both tmax and fuji for piggyback shots. A light 4x5 (orbit) works good on a Meade, but an larger, heavier 8x10 is going to push the gearing system, and slow the rotation. Tech pan was awesome. That film had great dynamic range for astro work.
Hyper kits are pretty expensive, I don't remember how much. I got mine from the Lumicon, but I don't think they sell them anymore. My tank will handle film up to 4x5. I've never seen a hyper kit for 8x10, but it would just require a larger pressure vessel.
I've never tried IR film but it could be interesting...
Good luck, can't wait to see your results!
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