Originally Posted by
koraks
The point of the Bergger product, the way I see it, is that due to its slow speed, it is more appropriate for use under an enlarger, as faster materials (e.g. 25-50 ISO ortho film) require very short exposures which may be challenging and preclude burning/dodging.
Of course there are all kinds of variations to the process of getting from a 35mm negative to a large format negative. The interpositive route you describe is one, and you could in that process of course also enlarge 35mm to 4x5" interpositive and then further enlarge the 4x5" interpositive to an 8x10" (or whatever size you fancy) negative. For this you could use any combination of Bergger Print Film and/or regular ortho film or even normal pan film or xray film.
Another route would be a direct duplicate negative through reversal processing, but this requires some calibration of exposures and reversal development chemistry/processing.
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