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A macro photograph showing the defocused effect of a shallow depth of field on a tilted page of text This photo was taken ... distance between the ... 4.0. DOF = 2.2 cm.
That distance is sometimes given on the filter in millimeters. A +3 close-up lens has a maximal working distance of 0.333 m or 333 mm. The magnification is the focal distance of the objective lens (f) divided by the focal distance of the close-up lens; i.e., the focal distance of the objective lens (in meters) multiplied by the diopter value (D) of the close-up lens:
If the lens is focused at a distance of 10.5 m, then everything from half that distance (5.2 m) to infinity will be acceptably sharp in our photograph. With the formula for the Definition 2, the result is 10 417 mm, a difference of 0.5%.
The effective focal length is nearly equal to the stated focal length of the lens (F), except in macro photography where the lens-to-object distance is comparable to the focal length. In this case, the absolute transverse magnification factor ( m ) ( m = S 2 / S 1 {\displaystyle m=S_{2}/S_{1}} ) must be taken into account:
A comfortable viewing distance is also one at which the angle of view is approximately 60°; [7] at a distance of 25 cm, this corresponds to about 30 cm, approximately the diagonal of an 8-inch × 10-inch image (for comparison, A4 paper is 8.3 in × 11.7 in, 210 mm × 297 mm; US Letter paper is 8.5 in × 11 in, 216 mm × 279 mm). It often may ...
DoF decreases as magnification increases; [2] in a close-up photograph of a miniature scene, the DoF is limited, and it often is impossible to have everything appear sharp even at the lens's smallest aperture. Consequently, the foreground and background are often blurred, with the blur increasing with distance above or below the center of the ...
This picture was taken in Wapusk National Park on the coast of Hudson Bay, Canada during a heavy snowstorm in November 2022. ... Canon EOS 5D Mark IV, 4.0/500mm, 1.4x converter, ISO 1000. Image ...
To focus a distant object (s 1 ≈ ∞), the rear principal plane of the lens must be located a distance s 2 = 50 mm from the film plane, so that it is at the location of the image plane. To focus an object 1 m away (s 1 = 1,000 mm), the lens must be moved 2.6 mm farther away from the film plane, to s 2 = 52.6 mm.