Re: nikon d40
- From: Paul Furman <paul-@xxxxxxxxxxxxx>
- Date: Sat, 17 May 2008 09:06:41 -0700
Geoff Newbould wrote:
Is there any discernable difference in using fine as opposed to normal image quality or even basic as one well known reviewer suggests.Up to 7x5 size prints.
It should be fine for 5x7 though it's possible you could see a bit of posterizing in softly graduated skies & such. Fine/basic refers to jpeg compression: it breaks the image into squares & averages the colors in each square to make smaller files. Try saving a copy of an image with graded sky (dark to light) at a very low jpeg quality setting in any program and you will see what this looks like. Even basic is pretty good though, you won't notice unless you edit it lightening dark areas will then show posterizing of those squares.
Another basic question, what advantage is there in using the shutter & aperture modes when these are both controllable in the program mode.
Program starts with an automated guess, with A & S you make the first guess. So no real difference. I simply find P mode confusing because it's hard to be sure what the camera will do next. For example, I just tried P mode & set the aperture wide open to f/2.8 then moved around to different parts of the room and after a while, it changed the aperture back to f/5.6. If you rotate the dial one way or the other, it uses a 'somewhat' faster or slower shutter speed but if the lighting changes, you can't really predict where it will land. While adjusting this way, an asterisk shows next to the 'P' on my D200, and you can set it back to the default guess by turning the dial back but after a while it's easy to forget which direction and there is no indication.
Likewise, manual mode is useful where you want even more control, A or S keep changing (one of) the numbers against your will when lighting changes a bit and that can be frustrating but at least *both* numbers aren't slip sliding around in an unpredictable way.
Rather than full manual, you can use exposure compensation, which is usually what I do, but sometimes that gets frustrating and it takes several failed shots before I break down & switch to manual. Ideally, I'd be paying enough attention to everything to simply use manual mode when appropriate but there is a lot to think about so my default is A mode. It relieves some pressure & lets me concentrate on the composition, focus, etc. If P mode frees you up to concentrate on improving the other parts of the picture taking process, that's useful. I'm just accustomed to starting with an aperture I have in mind so that little bit doesn't slow me down much.
--
Paul Furman
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