At 07:56 PM 9/7/2002 +0800, you wrote: > > > >Dave writes: >> Changing focal length alone can definitely alter the relationship between >> objects as seen in your view finder. This will be readily apparent if you >> spend a moment with a zoom lens. > >Sorry Dave - it may appear this way but if you try this experiment you'll see it's not as >your mind percieves it. Actually, appearance is precisely what I'm talking about. Follow me thru... Place a small sign on a stake and stick it in the ground. Take three paces and place another sign in the ground. Line yourself up with the two signs and walk thirty paces. When you look back at the signs the first one will look about 100 feet away and the second will look about 10 feet farther away which is as it should look because that is their relationship with each other and with you. Now with out moving, take a shot thru your 35mm SLR 500mm lens at the signs. They now look a lot closer to you and much closer to each other which is also as it should look because the 500mm lens on a 35mm SLR gives a ten X scope effect. The signs look about ten feet away and one foot apart. >Fit your camera to a tripod and lock on a 28mm lens and take a pic. Fit a 100mm and take >a pic. If you print both pics they will look quite different but if you enlarge the >centre of the shot taken with a 28mm so it frames the same as the 100mm shot, it will look >identical. This is because there is no difference in the spatial relationship between the >objects, the different focal lengths are just showiung you more or less of the scene I do not understand your point. You say I can not alter spacial relationships in an image by changing focal length and then claim to prove it by changing length of focus (raising your enlarger head) and altering spacial relationships in an image. >I have done a full sequence of shots showing this relationship, and once someone sees it >they comprehend immediately even though it seems counter intuitive compared to what you >see through the finder. > >karl Again, I don't understand your point. You can duplicate with your enlarger what I can do with a zoom lens. So? Dave East Englewood --------------------------- Every child is an artist. The problem is how to remain an artist once he grows up. -Pablo Ruiz y Picasso
