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Ray,
The film available "back then" was the limiting factor.
Grain size/ resolution was around 20 micron/ 40 line per mm resolution. (which simplistically equates to a 25 micron "pixel")
T max was 63 lines/mm and the 2415 at best around 100 lines/mm.
The QE curve (sensitivity) was abysmal! Then you faced the reciprocity failure curve.
Even the early webcams were better!
It's an interesting exercise to compare Michael Covington's two excellent books on astronomical imaging.
"Astrophotography for the Amateur" -1985 (film based)
and
"Digital SLR Astrophotography" - 2007 (CMOS)
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