Have you tried this method?
I am about to make 16x20 enlarged negatives from my 8x10 negatives in this way. We will see how it goes...
Also, Dektol is not a good developer to use for this purpose though a lot people (or teachers) seem to use it. There is a great article in Post Factory issue #2 on making enlarged negatives using Arista films.
Originally Posted by Chazzy