Honestly, I was very confused by the information on the SM website. It made
it sound like it would roast much less than advertised:
"We have tested the Caffé Rosto extensively and it can roast 4.2 ounces of
green coffee per batch, 6 oz. of coffee by volume. The instructions state it
roast 4 ounces by volume (as does the Hearthware models). Above 6 volume
ounces, the early stages of the roast are uneven, and although the finished
product may look even, it will not have the cup characteristics of a roast
that developed evenly. Note that even bean color and an even roast are not
always the same thing! Bean size will affect the amount you can roast."
and also ...
"... the batch capacity of this machine is between 4-6 oz, or 1/2 cup to 3/4
cup green coffee (which expands around 50% in the roast process)."
I tried with zero success to use these measurements before calling Steve @
Brightway who encouraged me to add more beans. I am now very happy going
with about 5.3 oz by weight - about an even measuring up.