Keith, I think that Tom lost the artument regarding focal lengh and perspective/AOV some time ago and just keep arguing so as not to loose face, digging an ever deeper hole for himself.
A. On 7/8/04 10:40 pm, "Keith Whaley" <[EMAIL PROTECTED]> wrote: > I essentially don't use any automatic 35mm cameras, I almost always use > mechanical cameras with a marked f-stop. > If I carry out the test you outline, I must measure the diameter of the > first camera's aperture blade's opening, and set the second camera to that > opening diameter, NOT the f-stop? > Is that what you're saying? > > This is cropping in the camera while recording the image, yes? > > What will that give me? > > Let's say I take my 105 mm lens and my 24 mm lens, set both cameras at a 20 > foot focal distance, for example, and make both lens openings the same, and > you're saying the photos I record will be the same, except for magnification > of the grain? > What will be the same? The area covered? Certainly not. > The image sizes will not be the same. A person's head in the 24 mm lens shot > will end up being smaller on the film frame than it will on the 105 mm lens > image. > > Taking that a step further, if I took a 100mm lens shot, and after changing > lenses (to the 24 mm), walked up to the subject and had their head image > size match the first shot, the image might be the same, but the perspective > will certainly and most noticeably change. > > What will "be the same," Tom? > > keith whaley > > > graywolf wrote: > >> Well, the question was about portraiture, as I recall. In actuallity any >> lens can be used for any photo as long as it is not too long to get the >> subject into the frame from the distance you have to work in. >> >> As for portraits, I love how our English/American cultural biases >> dictate subject distance. We tend to be comfortable holding >> conversations at about a five-foot distance. So we like portraits to >> show faces from about that distance. Then we try to impose that upon >> people who come from cultures where the norm is to get right up close. >> For them 2-3 feet is comfortable. >> >> We reason our discomfort away with silly statements about perspective. >> But that is really displacement on our part. As an example we are >> usually quite comfortable with portraits from about 3 feet, if we know >> that person intimately. Humans are such strange animals. >> >> An aside about cropping wide angles v. short tels: Distance, and >> aperture being the same, the only difference in the photos will be grain >> magification. Note I said aperture, not f-stop. That experiment will I >> show something about DOF that I have tried to explain here before. > >
