Originally posted by oldmower I was using the preview button while in M next to the ON button it lasts longer or is this incorrect and I should use the green button instead.
Originally posted by KevinR SS - Shutter Speed. You can use the preview button to stop down only to see what the image will look like, but I don't think it automatically sets the shutter speed. Will need to test.
Ed- just tested, and it has to be in M, and then use the Green button. Very easy that way.
You can do both. What the Green button does in M mode, is Center the meter. It will stop down your lens to whatever aperture you have set on the aperture ring, take the reading, and set your shutter speed accordingly. To my knowledge, there is no Auto ISO in M mode so whatever you have it set at is what it will use.
The Other way, is the way I use (may work differently on the K200d). Use the Optical preview (that lever that is the on switch). This will activate the meter but will NOT set the exposure. You can use your meter view in the viewfinder at that point to dial the aperture, shutter speed, and ISO around until you have the exposure you want.
If you are unfamiliar with exposure (the three parts and what they do), the green button will get you there for now. I suggest however you do some reading and experimenting with the subject. It is the same, regardless of what camera or lens you use. Once you master it, you'll be able to get any picture you want (within Some limits of equipment).