Thank you for your comprehensive reply.
I also use the Nikor F9 lens which, as you imply, requires a safari from the
back to trhe front of the camera for head shots. I compound the difficulty by
exposing FP4 at 25 ISO so that I can get a neg with full density range. In
consequence my exposures at around 1:1 tend to about one second. Works for grown
ups and mature kids. I also use an Ektar 14 inch and a Super Angulon F8, 165mm
which seems to produce close ups with remarkably little distortion. Even when
shoved up my own nose.
I have used platinum on gum for landscape but not portraits , yet !
How can I see an example of your prints ?
terry