I've been using the 645N for about 18 months now. I've probably shot over 100 rolls of 120 film, and the original set of AA Lithium batteries show no signs of slowing down.

I also wanted to comment on some earlier posts regarding zoom lenses. I'e found that the FA 45-85mm f4.5 zoom is slightly sharper than the FA 45mm f2.8 prime lens I own, and other photographers I've talked to have expressed similar opinions. The FA 80-160mm f4.5 lens is also very sharp, although I have not directly compared it to my FA 150mm f2.8. Of course, the zooms are much heavier and more expensive.

The FA 45mm f2.8 and FA 150mm f2.8 are both nice lenses - small, light, fast, and sharp.

I currently own the FA45mm f2.8 and previously had the FA 35mm f3.5 AL(IF). I think I may have gotten a defective sample of the 35mm f3.5, as it was not very sharp at any aperture, and clearly inferior to the 45mm f2.8. I have ordered another 35mm f3.5, so I should soon know if the poor performance of the first one was typical of the design.

I have also used the FA 45-85mm f4.5, and found it to be slightly better than the 45mm f2.8, albeit at the cost of greater size and weight. Surprisingly, even with the relatively slow f4.5 aperture, the zoom is still fairly bright and easy to focus on the 645N.

The new FA 33-55mm f5.6 zoom has recieved a few rave reviews, but I haven't tried it yet.