Tmax 100 with Tmax developer

I have been testing my Tmax 100 film with the Tmax developer. Unfortunately I have been getting incosistent results. I first developed it for 6.5 and 6 mins at 75 C and my negatives were lacking in contrast, highlights were underdeveloped. Then I tried it again at the same time this time my negatives were well overdeveloped. The difference between the two tests is that I agitated inititially for about 15 secs or less then every 30 secs for 5 sec in the second test. In the first test I didn't do the initially agitation but agitated it every 30 secs for 5 secs. I did several tests and am getting the ideal time of about 4.5mins at 75 C with initial agitation for about 15secs then every 30secs for 5 secs. Is this possible only 4.5 mins whereas the recommended time is 6.5 mins? Is the initial agitation that much significant to alter the film's density?

[ Previous | Next ]