Topic: Suggestions for Caffenol stand development of Kentmere 100 pushed two stops

[02Pilot]

That's a heck of a title....

Anyway, as you may have figured out, I'm going to shoot a roll of Kentmere 100 at 400 to see what happens. I've read some threads about this, I know it can be done successfully, but what I haven't found is any discussion on how long to extend development time when 1) using Caffenol, and 2) using stand development. FWIW, I've been stand developing K100 in my own Caffenol blend for 65 minutes at 20C. I've never tried pushing film, so I'm not sure exactly how to proceed. Standard development charts suggest a couple extra minutes per stop, which usually works out to +20% time or so per stop, so do I add 40% (26 minutes) to my stand time, or does it work differently with stand development?

Thanks for any insight you can provide.

[Ezzie]

Why would you want to stand develop it? Regular Caffenol is (or can be) speed enhancing. Reinhold's (imagesfrugales) standard recipes are all good for a one stop push as is. Add 2-3 minutes and N+2 should be no problem. With whatever version you choose, just remember you need a restrainer with 400 ASA film, or the film base can get a bit mirky.

Not done much pushing I must admit, but have tested TMY-2 and Delta 400 with 1-3 stop pushes on one roll, and to be quite honest there wash´t much in it. Depending on the contrast level of the subject material of course, both box speed and all other speeds were usable. I used Caffenol-C-H with 1.0g/l Potassium Bromide, approx 15 minutes.

[imagesfrugales]

Hello, Ezzie said already some important things. Personally I would recommend my Caffenol-C-L recipe. I got fine results with Rollei RPX100 @ EI 200 - 400 which is said to be the same film as the Kentmere100, in opposite to the RPX400 that is not the same as Kentmere400.

Stand or semi stand development has some advantages for enhanced film speed. The shadows can develop longer and the the highlights don't burn too fast. Furthermore the week Caffenol-C-L developer gives some finer grain. Imho the best Caffenol-C recipe for push processing. But beware, you must(!) use a scale and you must(!) check the washing soda for the water content. For stand development you also need a restrainer to get even development. For the Kentmere100 you can use 0.5 g/l pot. bromide or about 5 g/l iodized salt. Bromide is better but salt works. In any case, agitate the first minute continuosly and then let stand or agitate gently every 5 minutes or whatever you want.

Here's a sample, RPX100 @ 400 in Caffenol-C-L


http://www.flickr.com/photos/imagesfrugales/5600267898/#in/photostream

More samples from my flickr: http://www.flickr.com/photos/imagesfrugales/tags/caffenolcl/ And of course my blog: http://caffenol.blogspot.de/search/label/Caffenol-C-L

http://www.flickr.com/photos/imagesfrugales/5600267898/#in/photostream