How much time to develop Agfa Apx 100 as 200Iso with Rodinal

[anxo]

Hello,

I need to develop an Agfa Apx 100 shooted at 200Iso with Rodinal but I can't find how much time I need to develop it at 1+50 or 1+25 dilution or how to calculate it. Anyone can help??

[Keith Tapscott.]

As the film has been underexposed, I would use the 1+25 dilution. Perhaps try a 10% time increase and see how it goes.