Adox CMS 20 II & Pre-Exposure

I wanted to see if a little pre-exposure, would give this film a little speed boost, kind of like what Adox did for their HR-50 film, to give the shadows a bit more detail. Pre-exposure of film is known to have more of an effect in the toe of a film's characteristic curve, and proportionately less effect as exposure moves up the curve. The increase of exposure in the shadows decrease a film's contrast. Adox CMS 20 II is a film with considerable contrast. My thinking is that a little pre-exposure will help to decrease it.
#largeformatphotography #adoxcms20 #filmpreexposure
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[@chriscard6544]

Your tests are always very interesting

[@nereusnereis4248]

just wanted to say I appreciate how slow and quiet your videos are

[@seanmac5507]

Wow! No wild bears in Ireland since prehistoric times.

[@steveh1273]

very interesting Andy. I was a bit confused by the developer, at 0:42 secs the graph of the comparison shows fx-39, but later you used TD-3. I wondered why you changed developer and didn't stay with either fx-39 or the Adotech. Would overexposure and N-2 development have worked the same? So glad you didn't have a doughnut with you when that bear came down, maybe he smelled it on you? Lucky you. Your videos are most educational.

[@analogueandy8x10]

Actually, that is Adox's graph. I should have made that more clear. Sorry about that. I developed the sheets in TD-3. More exposure coupled with minus development would get us there, too, but I wonder how the high values would fair... I think with pre-exposure, the added density gives the film a boost in speed. I really need to do a comparison, though! Cheers!

[@Jim-z8j]

That bear most likely smelled the donut you were eating under your dark cloth.

[@analogueandy8x10]

😁

[@philipu150]

Much appreciated. However, something else besides the III pre-exposure was surely off to give the increased density in the high values shown in the the II pre (5:10, 6:20), which you left out of your comments. The sky value at 5:10 appears to show significantly more of a density increase than your curve (1:05) or the simple math would suggest. Or am I missing something here?

[@pietjekarbonkel2710]

I'am sorry I don't see the famous scharpness from Adox CMS 20 II 6:04 . And this is from 4x5 inch .......

[@analogueandy8x10]

The aim was to see if pre-exposure could be used to tame it's inherent contrast. Trust me. This film is quite sharp.

[@peinmilan]

Only heard about pre-exposure for Harman positive paper. It has never crossed my mind to try it with normal negatives...

[@analogueandy8x10]

I had no idea Harman positive paper was pre-exposed! It makes sense, especially if you are exposing it in camera. Pre-exposure can be a very useful techique when out in the field. I've used it on and off for many years. I find that for most films, a zone 2 pre-exposure (3 stops less from metre reading) does wonders.

[@peinmilan]

@@analogueandy8x10 Harman positive is not pre-exposed but they advise you to do that. :)

[@analogueandy8x10]

@@peinmilan I see, thank you!