Wrong settings while shooting film

My good friend shot an entire roll of Ilford 3200 speed film for a 35mm camera (b&w) but her ISO was set

on 100. Before she develops the film, how long should she develop it for? I've heard you can change the

density of the negative during the development process. Please help us out. These pictures are for our

photography class.

 

thank you

 

~v~

This is an extreme overexposure of 5 stops and to "pull" development that much would best be done with developers that you probably don't have access to in the photography class. Even then the results aren't going to be like what you would have with 100 speed film processed normally.

 

What developers can you use?

 

If its D-76, the most common developer used (especially in classes) then it should be diluted 1+3 with water and processed for 15 minutes. If the instructor doesn't want to dilute, and reuses a larger qualtity of D76 already diluted to 1+1 then I'd say 8.5 minutes.

Another thought: not at all to 'dis your friend, as we all have made mistakes when we started photography (and sometimes later in life :-)

 

Usually when shooting 3200 speed film it is for exsisting light photography indoors or outdoors at night. Depending on the camera used your friend may have ignored low light warnings. If the camera is automatic and is capable of slow shutter speeds it may be that all exposures were too long for handheld use. This will result in a lot of camera motion if handheld. OTOH if the camera doesn't have speeds slower than say 1/50th sec. it may be that the film was actually exposed at an effective speed between 100 and 3200 becasue the camera couldn't actually adjust for a 100 speed exposure in dim light. So your friend should think about where the photos were taken and under what conditions. If the camera couldn't have adjusted completely for EI 100 under the lighting conditions then the film might be at more like EI 800 and should be processed as such. But the whole roll would have to be similar. There is some latitude in the film allowing some correction in printing. For reference EI800 would be D-76 1+1 for about 17 minutes.

Good luck.

Per the official Ilford datasheet for Delta 3200:<br><br><i>"DELTA 3200 Professional has an ISO speed rating of ISO 1000."</i><br><br>So your friend actually overexposed it by 3.3 stops, not 5 stops.

<i>"DELTA 3200 Professional has an ISO speed rating of ISO 1000."

 

So your friend actually overexposed it by 3.3 stops, not 5 stops.</i>

 

True, but processing is normally listed for the 3200 EI. This doesn't change any times or anything in what I posted. It does mean that there is a better chance that highlight detail will still be usable.