Originally posted by culturalproduct Recently out shooting at night in very low light, around 2-8 sec, f2.8, iso800-1600 would be about the correct exposure.
My K20d however would not meter/expose below about 1/10th sec f2.8 iso 1600-3200. Or 1.3 second at iso 400. In P mode.
Below around that point it just flashes to show low exposure, and if I fire the shutter just gives me a black 'image.' So it is actually firing at the settings it shows on the screen.
By comparison, my old film Super A will flash to warn low exposure but if shutter is fired, will get a pretty correct or correct exposure down to 15 seconds at f1.7 on iso 400-800. It will sometimes flash a 1-2 second shutter speed warning but actually fires at several seconds on P mode.
So I get that there is a meter coupling range, but I've noticed many cameras with a P mode will shoot a longer range that seems to exceed the coupling range, I assume by cumulative metering during exposure but I may have that wrong.
I'm wondering if my K20d is malfunctioning or does it actually not have the ability to shoot below its official coupling range at all? Why would my Super A have a better meter/shutter than a K20d?
Any idea anyone?
There is a limit of EV where camera can't meter. I mean any camera. When you reach that, you have to find out what are the good settings to achieve the proper result for your chosen scene. For that, I suggest manual (M) mode or aperture priority mode (Av) - and experimenting until you get the proper look for the photo.
Regarding the behaviour of the camera in P mode, I'm not sure, but it worth checking what setting you have in the Custom menu "Program Line". Maybe it is set to "Hi speed" and the camera can't reach the preset values for that - or maybe there is a limitation in P mode - and you reached the "limit".
I suggest you to try the same situation in full manual (M) mode. I never use P mode, so I can't speak about that, but I'm 100% sure that there is no such a limitation in M or Av - as I've used my K20D in many situations below the level of light where the camera can't meter anymore, for example in caves, dark forest...