Archived posting to the Leica Users Group, 2003/01/14
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Henning, > Really, Austin. You have to _read_ the last message in which I > explained the geometry of focussing. The page that we were discussing, and that I claim is wrong, does not discuss what you are talking about as it is currently worded. Your premise is that you are "re-composing" by turning the camera so the subject is now off to the side of the finder. For that premise, you are correct, the focus distance changes, as the plane to plane distance changes. BUT...if you merely step to the side to re-compose, as it is clearly stated on that web page: "shift the camera side way" Which means basically to step to the side, planar with the film plane, so the model's eye is now off to the side of the finder. Shift does not mean turn. Perhaps the person who wrote the page meant turn, as it would seem...but that is not what it says. I do know him, and will offer a correction. Your plane to plane distance has NOT changed, therefore there is no need to modify your focus. A technique that can be used to avoid having to do any "calculations". I agree my original response was not well written, and could be misconstrued as to what I was trying to say. I'm sorry for that. > Focussing is not on an arc, it's on a plane. The rest follows. Read my 2nd to last post in response to Johnny, and you will see what I was talking about, and it is different than what you are talking about. Finding a focusing aid must be done along an arc if you are standing in one place and turning the camera to find that focusing aid. If you don't focus on a point on the arc that is the same as your subject distance, you will not focus at the correct distance. Austin - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html