Originally posted by PentaxGirl When taking manual shots, do the pictures come out pretty good?
If you are willing to take the extra few seconds required to get the exposure and focus right, using the older lenses is not really a limitation. Judge for yourself; have a look at
https://www.pentaxforums.com/forums/lens-clubs/27739-m-club.html,
https://www.pentaxforums.com/forums/lens-clubs/29948-k-club.html, and
https://www.pentaxforums.com/forums/lens-clubs/31601-takumar-club.html, where you'll find loads of examples of the old lenses in use on modern DSLRs.
Originally posted by PentaxGirl what is green button i read the articles but i still don't understand the green button.
These older lenses have an aperture ring. When you turn the ring while the lens is off the camera, you can see how it changes the aperture. But when the lens is on the camera, changing the aperture ring doesn't actually change the aperture diameter. If it did, when you stopped down the lens the image in the viewfinder would become very dark. When mounted on the camera the aperture is always at maximum until you press the shutter release. Only then does the lens stop down to the selected aperture setting.
Problem is, the camera doesn't know the aperture setting with these older lenses, so unless you have the lens set to its maximum aperture, you can't use the camera's light meter to set the exposure properly. This is where the Green Button comes in. When you press it, the camera stops down the lens to its selected setting and takes an exposure reading, then sets the shutter speed. If you look through the viewfinder while pressing the green button, notice how the image darkens for a moment (if you have selected something other than the maximum aperture).
Originally posted by PentaxGirl I've only ever used a point and shoot camera so this will be interesting to learn something new.
It's a good learning exercise, because you have to think about the aperture setting and shutter speed for every shot. You'll get the hang of it quickly. In practice all it means is, twist the aperture ring to the desired setting, compose the shot, hit the Green Button, and fire away.
Depending on the lens and camera, you may want to check the exposure of the first shot you take to confirm that it is correct. Or, instead of taking a shot and then checking it, you can also use the preview feature to take a shot but not record it on the memory card. I actually prefer this method.