(شرح الجدولين رقم ٤٨ ، ٤٩ ) بعد الجسم عن العدسه لتكون صورته حادة .

(Explanation of tables No. 48 and 49)

The distance of the object from the lens so that its image is sharp

(When shooting close-up with the use of a positive additional lens)
Whatever the focal length of the original lens, and whatever the size of the camera

- Example: To depict a cartoon, I saw that you put the graphics on a distance
50 cm from the original lens, between:

a - the focal length of the positive auxiliary dowel, and its power in diopters

B - The number to which the distance is set in the original lens (in its Focusing Scale division).

Answer: From the table (No. 49 p. 105).

comments :

(1) The focal length of the positive additional lens is the maximum that cannot be increased. If the focal length of the positive additional lens is = = 20 inches, for example, then this distance is considered a maximum distance that must be available between the body and the lens in close-up conditions with the use of this positive additional lens.

(2) If the original lens is set to infinity (a) in the Focusing Scale division, the surface located at a distance equal to the focal length of the additional lens must be perfectly sharp & in focus.

(3) This table remains valid whatever the focal length of the original lens installed in the camera.

(4) Table No. 48, p. 104 differs from the other (No. 49, p. 105) in that the first dimension is estimated in English measurements (in inches and feet), while the second, No. 49, has estimated this dimension in metric measurements.