Re: Film processing

[graywolf]

Well, I think C-41 can actually be pushed by developing at higher temperature. 
No minilab is going to do that, and have to wait for the machines to come back 
down to normal temperature. But if you want to hand develop at home you probably 
could push it. C-41 film however normally has 1-2 stops of underexposure 
latitude and 2-3 stops of overexposure latitude (which is why many pro's set the 
ASA at 2/3 to 1 stop overexposure), so you would have to expose outside that 
window to make pushing or pulling worthwhile.

Slide film, is normally developed in two steps. By increasing time in the 1st 
developer you can increase the film speed, though that decreases quality 
somewhat. Slide film has no latitude to spare if you over or under expose by 1 
stop you normally have to pull or push the development. Of course you can get 
into a thing like I did once where I inadvertently overexposed by 1 stop and the 
lab pulled it 2 stops ruining it in the opposite direction.

B&W can be custom developed to just about anything. Before Techpan some folks 
used to develop litho film in super compensating (low contrast) developers to to 
get extremely fine grain film at a very low speed (5-10). You can go the other 
way and get very high speeds from ordinary film.

In all these cases there is a quality v speed trade off.

--

Lon Williamson wrote:

I trust William Robb's opinion, and I've heard him write (man,
now THAR's a conundrum) many times that C-41 cannot really be pushed.
Why is it that such is true of neg film, but not slide film?


--
graywolf
http://graywolfphoto.com
"You might as well accept people as they are,
you are not going to be able to change them anyway."