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  1. #11
    Ian Grant's Avatar
    Join Date
    Aug 2004
    West Midlands, UK, and Turkey
    Multi Format
    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.


  2. #12

    Join Date
    Aug 2008
    Medium Format
    Quote Originally Posted by Ian Cooper View Post
    I fancied having a go at reversal processing, but didn't fancy the idea of mixing my own chemicals. Reading some of the on-line guides also left me more than a little apprehensive about the idea. In the end I gave the "Speedibrews" "Celer Reverser" B&W reversal kit a go, and can certainly recommend it. The chemicals came with clear, easy to follow instructions and times for a whole range of different films. The chemicals come in seperate sealed bags ready weighed out, all you need to do is empty each bag of chemicals into the stated volume of water - then stir!

    You gain a 2 stop speed increase on the film's box speed, so the FP4 I initially used needed to be rated at 400asa (ok, 500 to be picky!). I followed the instructions to the letter and had no problems. The re-exposure stage is done with the film still on the reel in a tank of water (to avoid water droplets acting as mini-lenses). Despite being one of my prior concerns with the reversal process, the fogging was dead easy.

    The instructions do warn that the process will leave the emulsion a little fragile, and recommends not using a film squeegee. After scratching negatives with various squeegee tools, I now only ever 'squeegee' my negs between two fingers (my own), so carefully did the same again and didn't have any problems.

    The next time I tried the reversal process I used PanF. Unfortunately that emulsion seems a little more sensitive to the chemicals, as flakes of emulsion fell off during (gentle) rinse cycles at the end of the process! Clearly some films work better than others!

    The instructions do warn that some experimentation regarding times might be necessary to reach personal 'ideal' results, but they include pointers on what times to vary to acheive different effects. Certainly the stated times for the FP4 I used turned out to give perfect exposure.

    I bought the kit from "RK Photographic" as they don't have the £25 minimum order charge policy that Silverprint operates - interestingly the receipt was posted to me from RK, but the chemical kit was shipped to me by Silverprint! Lol.

    As usual, I have no connection with the companies concerned other than as a satisfied customer.
    thanks for posting your results with CelerReverser!
    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!

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