One of the few things I remember from 1970s film school, largely because it was beaten into us, is "basic exposure rule":

ASA/ISO 100, 1/50th @ f2.8 = 100 fc

f2.8 > f45 is 8 stops, so you'll need some combination of film ISO, shutter speed, and lighting to get there. For example: ISO 400, 1/2 second, f45, 200 fc, if my math is correct.

After that, the other factor for the fresnels is light-to-subject distance and inverse square law.