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#1
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Towering Rockface Tilt Problem
Twice yesterday I found myself in front of hundred foot rockfaces
that seemed to prefer that I did not tilt. That is, from the base where much important detail was, to the top of the rockface, where I had to maintain focus to unify the structure, I found that I had to be perfectly vertical with my standards. This however left background receeding information to go out of focus, and the aperture could not save it. Esthetically the image is good. In fact I'm interested in doing more selective focus work, but for right now, I'd like to know if there is a solution to this that I am overlooking. |
#2
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Towering Rockface Tilt Problem
Ken Smith wrote:
Twice yesterday I found myself in front of hundred foot rockfaces that seemed to prefer that I did not tilt. That is, from the base where much important detail was, to the top of the rockface, where I had to maintain focus to unify the structure, I found that I had to be perfectly vertical with my standards. This however left background receeding information to go out of focus, and the aperture could not save it. Esthetically the image is good. In fact I'm interested in doing more selective focus work, but for right now, I'd like to know if there is a solution to this that I am overlooking. I don't believe there is any solution except for stopping down further. When you tilt the lens, you get a tilted plane of exact focus. About that plane is a wedge shaped region bounded by two planes on either side of the plane of exact focus. They meet in a line called the hinge line (not the Scheimpflug line) below the lens. Its distance below the lens varies with the tilt angle, increasing with smaller angle. That wedge shaped region includes what will be sufficiently in focus. Its angular opening depends on the relative aperture. Generally, anything of significant vertical extent relatively close to the lens will necessarily extend outside any wedge achievable by tilting more than a miniscule amount. If you can get the entire rock face in the frame, and you don't have to worry about subject movement, just stop down enough so that everything you want is in focus. If that is not feasible, then I think you are out of luck and you will have to give up on getting more distant parts of the scene critically in focus. |
#3
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Towering Rockface Tilt Problem
Twice yesterday I found myself in front of hundred foot rockfaces
that seemed to prefer that I did not tilt. That is, from the base where much important detail was, to the top of the rockface, where I had to maintain focus to unify the structure, I found that I had to be perfectly vertical with my standards. This however left background receeding information to go out of focus, and the aperture could not save it. Esthetically the image is good. In fact I'm interested in doing more selective focus work, but for right now, I'd like to know if there is a solution to this that I am overlooking. If you have a vertical subject in front of you, or a series of vertical subjetcs such as a series of doors, a stand of trees, a rock wall then tilttiing is only likey to get you in trouble. I always suggest that large format photographers level their cameras front to rear and left to right as a starting [osition. Then use either front rise and fall and shift or back rise ands fall and shift as compositional tools. Once the composition is worked out then decide if swings and tilts will be helpful. While some people use front and rear swings and tilts interchangeably I do not and use them for different purposes. It sounds like you did fine. You just encountered a situation where swings and titls would not help you. In your situation f-stops and the proper placement of the vertical plane of focus is the answer. By proper placement of the plane of focus I mean to focus wide open so that the nearest object you care about and the farthest you care about are equally out of focus. Then watch through thte gg as you stop down and the dof lines will spread to include these areas. A gg brightener will help a great deal. In the Jan/Feb issue of View Camera I started a series on setting up and usng the view camera. Part 2 will be in the March/April issue. steve simmons www.viewcamera.com |
#5
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Towering Rockface Tilt Problem
And I
think its about time I got a subscription to your fine magazine. Those newstand prices are murder. I've said for years that if someone buys 3.5 issues per year from the stand they could get all 6 delivered to their home. Each issue is wrapped in a plastic bag for protection. To subscribe just call 800-894-8439 m-f 8-5 mountain time or give us an address via e-mail and we will bill you. View Camera Box 2328 Corrales, NM 87048 |
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