But I don't think I've seen comments about usefulness of the LCDs or viewfinders in really low light - like ISO 2500 or 3200 f1.7 1/15 levels of light. Club level darkness or night streets darkness.
Do they work then? Well enough for manual focus?
thanks,
I shoot in light levels lower than that and it is no problem for manual focus, even with most of the AF lenses set to MF.
The key is the maximum aperture of the lens. Anything f/2.8 or larger is fine but obviously a f/1.7 lens is much better still.
You will have problems in a club at 1/15s as this isn't fast enough freeze movement so expect a lot of wasted shots.
On the E-P1, IS will do wonders but that really only helps with static shots. Subject movement rather than camera shake is the issue.
ISO3200 is usable but can be quite noisy with dark bits in the scene. You can get small prints and resized for PC/Internet use at ISO3200 but if you want to print critical stuff at A4 size or around 10x8", I would suggest you not go above ISO2000.
I tend to do 4 to 20 second exposures at f/4 to f/5.6 and abosolutely minimal lighting quite a bit but I also usually shoot in the range of ISO200 to ISO800.
As long as I can find something with a little contrast in it so I can see an edge, I can focus on it. If I cannot, then old legacy lenses such as OM lenses with a focus scale are the way to go. Unfortunately there isn't really any wide and fast old glass but there is plenty of stuff in the 28mm to 85mm range that is affordable.
BTW, I use the Panasonic 20mm f/1.7, Olympus OM 28mm f/2.8, Olympus OM 50mm f/1.4 and a Schneider 40mm f/1.9 fairly frequently in minimal lighting.