last night when getting ready to hit the sack i was still trying to figure out what the guy told me...Something inside me was telling me he was right, i just had to figure out what he was saying. And then it just was like someone turned on the lights(thank you Lord!
) and it hit me what the guy was telling me. I explained it to mom this morn and she understood it, so i hope i can explain it here. So here goes(now i am going to explain as if i were explaining it to a 'newbie'.): I'll use the example of a daisy shot i took. I used a fast shutter, and the daisy[front of pic] was perfect, but the background was black. Due to the fact that since the shutter was so fast it only 'grabbed' the light that was directly in front of it. If i would have used a longer shutter the light from the background would have had the time to reach the sensor. Thus making the shutter speed "lighten/darken" the background. But since my aperture is large at this point and time, the front of the photo(the daisy) would be totally blown out because the light in front hits the sensor for a longer amount time unlike the light from the back. So make the aperture smaller, and that will allow the front of the picture to be darker. Thus the aperture making the front of the picture "darker/lighter".
Now i am sure this is general rule, but doesn't work with everything. Like Bob's photograph. He took that pic at 1/8000s, but the background is still properly exposed.
I remember reading somewhere(i think here...) where if you change your shutter speed a stop up, you need to change your f/stop a stop down....or something like that. whish i could remember what it was....
anyway. thought i should explain what was reviled to me.
EDIT: wow. i am so happy. I was just wondering why a smaller aperture/long shutter speed alows great depth of field. It makes sense to me, and i would like to explain it(if i explain things to others, it seems to make more sense to me that way...and you guys can tell me if i am wrong. lol) Since a long exposer alows light from the very back of the shot hit the sensor, you'll get the detail of the background, because the light from /all/ spots back there are hitting the sensor(photography is art with light, i remember someone telling me). When you have fast shutter speed the light in the background doesn't get a chance to give the sensor all its detail(even though sometimes it'll give the sensor a generall idea of what's behind there.)
(i hope that made sense y'all...)
I've known a small aperture/long shutter speed, creates a greater depth of field but never known the "why" behind it.