Focusing the View Camera: A Scientific Way to Focus the View Camera and Estimate Depth of Field. by Harold M. Merklinger. Merklinger’s method is less widely used, but is much easier to apply in the field. . Harold Merklinger describes his method for optimizing depth of field here. Harold Merklinger on Depth of Field. If you arrived at this page by a direct link, it will be helpful for background information if you read my article, More on Depth.
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But it is absolutely natural.
Technical Books on Photography by Harold M. Merklinger
This case is similar to the previous one. These three planes are the film plane, the subject plane and lens plane. The camera has no viewfinder other than a piece of ground frosted glass placed where the film will eventually go.
In this case, the lens is focused at a distance that is slightly smaller than the hyperfocal distance. Available through Seaboard Printing.
Main page List of articles. In this article I can give only a brief explanation of Harold Merklinger’s approach. All approximate theories work perfectly within the boundaries of this area. It is jarold than one might imagine – especially printing at high quality.
I aborted a print uarold shortly after it started. Focusing at infinity should be preferred to focusing at the hyperfocal distance, only if all of the following conditions are observed: However, the 18mm lens should be sharp from about 5m to infinity for merkkinger aperture setting.
However if we make a sufficient enlargement, it will not be difficult to notice that the DOF area is asymmetrical. With the help of a non-linear transformation, the object field, where fuzziness varies linearly, can be recalculated into the image field model, where fuzziness is described by non-linear functions.
His disk-of-confusion in the object field unlimitedly grows behind the object merkilnger focus see the diverging blue dash lines in Fig. Junk has a web page describing such application of Scheimpflug’s methods. As this was a test print anyway, and the top of the print contained nothing but blue sky, I re-submitted the same sheet of paper for the next print of the same image.
Merklinger’s Photo Books
That range of distances merklinyer called the depth of field. Due to this fact, resolution diminishes as the distance from the camera increases. To look at this we can consider the simplifying assumptions of the camera being mounted level at a height L above the ground which we can assume is a plane.
Like the first rule, one of the planes is the subject plane. The front limit of the DOF area equals the hyperfocal distance. Merk,inger article merklingger 2 ] I showed how to derive the formula that describes fuzziness behind the focusing point. Conversely the close objects can appear sharp with lower resolution because the detail is closer. When we focus our eyes at infinity, we will not be able to distinguish small details at large distances.
There may be a few suppliers out there who still have a few copies, but I am out. The lenses were focused on the curtain. And, of course, a photographer’s experience also does matter. Any movement of the camera back towards or away from the lens, working through the Scheimpflug Rule, causes the plane of sharp focus to rotate about the Hinge Line.
See the View Camera Focus Page.
However, as a Russian saying goes, simplicity can be worse than larceny. With a view camera this is the normal way it’s used. On the other hand, we see that we can change the degree of fuzziness to avoid double-line streaks in photographs. The goal of my experiment was to detect any differences between two shots, one being taken with a lens focused at infinity, and the other being taken with the same lens focused at the hyperfocal distance.
Hyperfocal distances and Merklinger’s method in landscape photography
I believe, in this case it is better to focus the lens at the hyperfocal distance. If focusing can be described by Fig. Harold Merklinger was very unhappy with the traditional recommendation to focus the lens at the hyperfocal distance to obtain the largest DOF. The Scheimpflug Principle is also used extensively in Ophthalmology – the diagnosis of medical problems related to the eye.
Information on how to contact the author is provided at How to get these books. When focal length increases, the front area of sharpness will grow, while the rear area of sharpness will shrink. Scheimpflug’s British Patent k download describes how, among other things, three planes must converge along a single line. An object one-tenth of the way back from D, towards our camera that is, at a distance of 0. The nearest point of acceptable focus according to the conventional depth-of-field formula is shown for comparison.
Moreover, this growth is non-linear. Much of my time over the past year has been aimed at better understanding what is involved in dealing with black and white images in the digital domain. The traditional approach treats the situation as follows. The power of the view camera is not so much in the method of previewing the image although some will argue that point but in the ability to focus precisely at multiple distances simultaneously.
It should be kept in mind that when we focus lenses at infinity, we always make close objects fuzzier.