Hi All, This is my first time posting as I recently returned to film photography and just started B&W shooting for the first time. I have a couple of questions regarding Diafine film developer but first some preamble. Diafine states that you can increase the EI of the film you are using with results comparable to the manufacturers stated EI (e.g. 160 EI for TMX 100). In addition, development times basically fixed and it allows for multiple rolls of film with difference EI ratings. The questions are as follows: Can you use different EI on the same roll without blowing out highlights or losing shadow detail? This is something IIRC you can do with Ilford XP2 Super. Can you use the manufacturers state EI or are you "stuck" with Diafine's rating? Thanks in advance for your responses!