Paul Howell said:
I have never owned a F4, 5 or 6 so I can't comment about their reliability, if I hit the lottery this weekend an F6 is on my shopping list.
I had an F3, sold it to buy an F4, and I also have an F6. The F4's are worth practically nothing now, so I kept it, rather than sell it at give away prices. So far I've not had any reliability issues with any of them, although the F6 is pretty new so there shouldn't be any issues.
Each is different, and I liked them all for differnt reasons. The F3 is a very traditional camera, and without the motordrive it was pretty light and compact for an SLR. I wasn't keen on the heavily centreweighted light meter, but I loved the feel of the manual film advance, it was such a smooth mechanism. With the dedicated nicad pack freshly charged I could get close to 9 fps out it, and with a friend timing me I managed to shoot
and rewind a 36 exposure film in 10 seconds.
The F4 is wonderful from an exposure meter point of view, the matrix is very accurate and difficult to fool. 90% of the time I leave it on matrix metering and program and get great slides. The AF is getting dated and it can have some trouble with moving subjects ( I shoot a lot of trains), espcially if they have large spaces with little contrast, like the side of a locomotive. Generally though I can flip to manual focus and leave the lens at infinity and the results are sharp.
It's a tough camera, mine has fallen off the roof of a truck with a 300 mm lens attached and it was just a bit dusty but worked fine. It was a gravel road that it fell onto, and was fine are I dusted it off. Mine had been backpacked into all sorts of places and used at -40 in winter and it always works as it should.
I like the removable viewfinders of the F3 and F4, as if I'm doing a ground level shot I'll just pop the finder off and use it as a waistlevel finder. I do miss that about the F6, but that's about all I miss.
The F6 is quite a bit smaller and lighter than an F4, or the F3 with motordrive, and doesn't give up anything in terms of performance. The AF is great, although I do find a slight bias toward overexposing slides, compared to the F4. I'm a left eyed photographer, and I do find that my nose tends to change the focus point selection lever on the F6, I need to keep the lock on to prevent it from changing. I'm in the habit of checking it each time I use the camera. if you can afford it, its an improvemt over the F4. I can't speak about the F5 though, I've never used one.