A well processed B&W reversal positive will have a far greater tonal range than a corresponding negative, and should scan better. Look at Gavin's (coigach) images here on APUG
Most processes don't increase the EI by two stops, but you can push & pull process just like with E6 with some trade off with Dmax contrast etc, but you do need to do your own speed tests.
thanks for posting your results with CelerReverser!
Originally Posted by Ian Cooper
that´s what i found in my own experiments:
developer: 8´, with 2 inversions every 10 seconds
blix: 3´30" shaking the tank like a crazy!
exposure to light: i remove the reel from the tank and use a flash to give reexposure to the film.
redeveloper: 4´with inversions every 20 seconds.
The best result that i've found is between 800/1000 iso. The tonal range and contrast are impressive, at least compared to my best prints using negatives and the emulsion isn't that soft as with other films i tried. The base from FP4 give a coolness to the image really nice. Checked with 35mm and 120 film.
developer: 6´15" with 2 inversions every 20 seconds
blix: 6´with continous inversion of the tank
reexposure: remove the reel and use flash as with FP4
redeveloper: 5´with inversions every 20 seconds
The best result that i've found is at 500 iso. It lacks a bit of contrast for my taste, i tried to develop it more but then i loose details on lights, so is a bit flat flim for slides, the lower tones are really nice with good separation btw, it seems that midtones and highlights doesnt get too contrasty. The base is on the warm side, and its a really really soft emulsion anything seems to scratch the film. Checked only on 4x5 size.
have a nice day!