Quote Originally Posted by dpurdy View Post
I would suggest using a zone 7 density rather than zone 5 because in my experience uneveness problems will show up more.
Back in my days of shooting products on a blank light grey it was a real headache getting it even.
Also because it is useful to have your zone 7 processing time down.

If using your enlarger make sure it is way out of focus from the light source.

That graphs under Stouffer scale step 11 which is 1.56 density.

So if you expose film that much less than the full 5 seconds at EV0, you will possibly get 1.0 density when developed.

1.56 divided by 0.3 is 5.2 stops...

So somewhere about a 1/4 or 1/8 second should do the trick...