Hi, ok so i got a question for ricoh and maybe the x100
I know the ep-3 , panasonic gf-3 surely can do this.. because their focus is fast.
This is one of my deciding factor.
when the subject is walking past you, just walking fast. (be it at night or day)
and your standing still. waiting for that person to be just in front of you, hold up the camera,
can you focus in time to capture this person face up front while he's walking?
i know most cameras if the subject is still, any camera can capture the person face.
I've done it before.
In bad lighting or night, you would need to pump up ISO. to get good enough shutter speed though. But like I have said, I have shoot at ISO1600 to 3200 and the result is still quite alright. and what you need is a fast lens and a flash (if possible).
It would be harder for the GXR with M-module to do this unless you are very fast with manual focus, or good at pre-focusing at a set distance. The choice of lens also plays a part. Some of the wider angled lenses like the Voigtlander 15mm are practically focus-free on the GXR but you would not be able to get half-body or head shots without fiddling with the focusing ring.
LOL you should wait for the NEX-7
Further to the above comments on Ricoh, its GR Digital IV is just out. Good for street photography. But uses just the usual PnS sensor size & focal length is FIXED. The SNAP function is a snap! It got 1:1 format too.
This is mainly due to EVF/LCD refresh rates and gain (esp. in low light conditions)
A lot of such focus issues for the scenario you mentioned can be lessened with preperation.
For me, these are the 2 things I'd do :
1. Esp. with primes, you roughly know what framing you want/like for most of your shots. I like half body shots. So with a 35mm lens on APS-C, I know its about 3m from subject. So my lens is typically pre-focused to 3m.
Move up to approx 3m (or subject approaches to ~4m); pick up camera, and by then subject has stepped into field of focus. Snap the shot.
2. Stop down f8 for hyperfocus or zone focus. It also works for f5.6 and f4, but obviously the 'zone' where subject remains in focus decreases.