How much longer should I develop my film?

Question

I shot black and white film at ISO 400, but the film was actually ISO 125.

Answer 1

Hi Angoreo, You didn't state what type of film you shot in your question. I am going to assume you shot Kodak Plus X pan which had a ASA of 125. Use the T-Max Developer 1:4 ratio of developer and water. Depending on the size of your tank and how may rolls you are developing. Usually the ounces are printed on the bottom of a plastic tank. Take the number of ounces and divide by 5 that will give you the amount of developer you will need. Then add 4 parts of this measurement of water. Use a warm bath or Ice with water to slowly get it your solution to 75 degrees or 20 Centigrade. Process for about 7.5 minutes. States 9 minutes for 500ASA. I don't want you to over develop it. you could go to 8 minutes but not more. Agitate every 30 seconds. On the T-Max bottle it gives you the ASA Range for Plus-X Pan under I.E. Good Luck ! I hope this will be of some help to you !
By the way...if you want to try push processing...look for a developer called Acufine. It comes in a little can. You can shoot up to 3200 ASA and get really neat results. Check it out if you like shooting in low lighting situations.
Jeannine

Answer 2

Buy a copy of the Kodak Darkroom Data Guide. Or look it up on the kodak web site.