Ok, so my query is this: The Eldar holo field confers a -40 penality to balistic skill. Imperial player shoots, and thinks that he has hit the Eldar vessel with 5 degrees of success, confering a critical d5 role due to the weapon crit rating of 4. The GM tells the player that he did not hit with 5 degrees of success, only 1 (due to the -40 penality) so does not earn a role on the critical chart. Player disagrees - mayhem ensues. I think the GM is correct. Is there anything in the rules that say otherwise?
Thanks.