Would my fellow board members be so kind as to help me nail down my assumptions re Nikon and FILL flash capabilities. In this posting, I am interested in fill flash. Not in the 3D capabilities of the F5. I have had a few too many less than ideal results from heavy contrast lighting on one party of two, or one, themselves. It may not be possible to get fill flash to save the day, particularly with the F4, and it may be necessary to carry a reflective light bouncer, such as the photoflex, even if that means either another person to hold it or a stand/tripod to hold it. In any event, it is my understanding that the F4 will FLASH Matrix Meter with AIS lenses. But it is my impression that the F4 will only AUTO FILL FLASH with CPU chipped or AF lenses - based on the following: Halfway down the page of this url: http://www.mir.com.my/rb/photography/hardwares/classics/nikonf4/flash/ there is the statement: Nikon F4 - Matrix Balanced Fill-Flash works with all AF, Ai-S and Ai Nikkor lenses. But at this location 2/3 down the page: http://www4.ncsu.edu/unity/users/j/jnwall/html/f4faq.htm Automatic balanced fill-flash: Possible when AF Nikkor or AI-P Nikkor lens is used with Nikon dedicated Speed lights. There is the immediately above specification that AUTO balanced fill flash will only work with AF lenses. Or should one just forget about fill flash with the F4, use lite disks for bounce filling and follow the MANUAL approach as per: http://www.dantestella.com/technical/fill.html Half way down the page the paragraph starts with: \\\ In a perverse way, this is the easiest way to do fill flash, because manual flash does not care about how reflective the subject is. \\\ This location gives good definitions http://www.maxwell.com.au/photo/nikon/speedlights/ However, Matrix fill flash and AUTO fill flash and the F4 and AIS versus CPU lenses is still not certain in my camp. My plan is, if the F4 will meet the need, fill flash wise, to hold off on and to leapfrog over the F5 when the time comes for digital, after a maturing phase in the digital evolution. This assuming that the F5 is not a vast degree better at FILL flash, than the F4. and the 3D part is, again, not of concern to me. I have other points but it is probably better to present this, above, on its own. Thanks.