5x and 10x magnification both work very well in photo and video mode. It seems that the hdmi output limitation doesn't apply to smaller sections of the sensor since the net pixels displayed remains within the hdmi output's limit. Still the magnification is not optical. You are simply taken to the resolution limit of the sensory itself. My impression is that it is excellent for focus assist.
I cannot find any way to display either live view or video output as full screen on the FW759. It doesn't bother me, knowing the camera records outstanding images and quite good video to the memory card. Once you get used to the FW, you will see there is more than enough info coming through.
Here are some other items that may be useful. If you buy the FW with the recharge kit expect that battery (rated 6600 mAh) will not be that good. These sorts of batteries coming from China have a bad track record. The one they sent me was dead and unchargeable. The 6600 is also huge and does not balance well with the small (otherwise adequate) hot shoe ball head. I picked up a Duracell 2200 at Battery World for $50. The ebay seller is having a replacement sent from China but my expectations are low.
You might also want a 12V 2 amp AC adapter. The seller recommends 2 amps. Amazon for $6-7.
The ball head has a loose base. The lower 1/4 20 thread fits into a tapered thread so that the head can't screw passed 90 degree alignment. This is a common annoying problem for these ball heads. J-B Weld is an easy permanent fix.
You'll love the monitor. Good luck!
