Perspective (foreshortening, etc.) is determined entirely by the camera's position in relation to the subject matter and is independent of format or lens choice. How much "shake you can take" is entirely determined by the geometry involved. The geometry that's important is the ratio of the focal length to the size of the chosen frame. I say chosen frame because if you crop, then that's equivalent to having a smaller format and the blur produced by shake will be larger in relation to the chosen image. The old "rule of thumb" of being able to handhold one over the focal length is roughly "valid" for full frame 35 mm only. If you can hold a 35 mm camera with a 50 mm lens steady at a 50th of a second, then you can hold a 6x7 with a 100 mm lens steady at a 50th of a second (assuming the beastie doesn't tire your muscles too much).
Regards, Bob... ---------------------------------------------------------------- They call it PMS because Mad Cow Disease was already taken. - Anonymous, presumed dead. From: "Nick Clark" <[EMAIL PROTECTED]> > I'm still not sure about this. While I agree that on the first image i.e. the sensor or film the effect will be the same as for the 800mm lens, as the enlargement to a same sized print is greater for the *istD compared to the 35mm film camera, you are also enlarging the shake which will then be comparable to the longer lens. After all a selective enlargement of a negative has the same effect with regards to foreshortening as fitting a longer lens if the camera position doesn't alter. > Or am I mistaken?
