All this discussion is based on assuming that the lens would open to F2.8 to begin with, which may not be the case at all. Sure, you can see the aperture mechanism reduce itself as you zoom toward the short end, but how do you know it would go to F2.8? What if it only went to F3.5? In that case, it certainly would make a lot more sense to keep it a constant F4.0. Personally, I'd have a hard time believing that this lens, with it's size and weight, could ever manage an F2.8.
Thanks, Ed http://lightandsilver.com - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
