I have had good results exposing Kodak T400CN at EI 200 through 1600 without any special instructions to the developing lab (I use a good pro lab). I have used the T400CN for indoor sports events at EI 1600 without special instructions to the lab and I have been pleasantly surprised with the results. One note of caution, though, is that I use the Zone system for exposing negatives and I tend to expose cautiously for shadow values with important shadows placed at Zone III or IV depending on the stuation (I use a Pentax digital spot meter and use my camera in manual mode). When used this way the negatives are thin but printable. If I were to use it at EI 3200 I would definitely have the roll push-processed. According to my understanding, the push processing simply involves longer processing times, just as it does for B&W processing.(posted 8609 days ago)As always, you should expose some test rolls under the conditions you expect to encounter to make sure you get the results you need. Try exposing two rolls at EI 1600 and ask to have one push-processed two stops. For EI 3200 why not try Ilford Delta 3200 - unless processing B&W is out of the question.