Okay, I got five bottles of this spendy Tetenal Neofin Blau to try with Efke
25 film.  I say spendy because I'm accustomed to using Rodinal for
everything. So shoot me - it's what I've become comfortable with but I want
to try this stuff.

I do not understand what the literature means. I begins by saying that the
recommended development times is for "one film" and to add 20% developing
time when developing "two films simultaneously". (Finally they add that one
must use a "prologation factor" for given dilutions (in my case 1,3 or 1.3).
I understand the prologation factor. No problem there.)

But what do they really mean by "one film"? Are they presuming roll film in
small tanks? What of 4x5? It seems unlikely that they mean that only two
sheets of 4x5 can be developed in one quantity. I use the Combi Plan tanks.
6 sheets of 4x5. (Now Frank, don't spoil my day and remind me that I should
be using a Jobo.)