
Regarding post #23, the formula shown is incorrect.
For a negative whose format rectangle measures 56mm x 112mm and 4270mm of negativetoprint distance and using a 135mm lens, the magnification is 29.6X.
That makes the dimensions of the projection approximately 1657mm x 3315mm = 65” x 130”.
For an 8” x 10” negative whose format rectangle measures 195.5mm x 245.5mm and with 4270mm of negativetoprint distance and using a 300mm lens, the magnification is 12.1X.
That makes the dimensions of the projection approximately 2365mm x 2970mm = 93” x 117”
You can print whatever fits inside the projections.