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Since non-macro lenses are optimized for small reproduction ratios, reversing the lens allows it to be used for reciprocally high ratios. Macro photography may also be accomplished by mounting a lens in reverse, in front of a normally mounted lens of greater focal length, using a macro coupler which screws into the front filter threads of both ...
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:
This category is for photographic lenses capable of true macro photography, i.e. producing at least 1:2 reproduction ratio, or 0.5x magnification. Pages in category "Macro lenses" The following 25 pages are in this category, out of 25 total.
Adding a macro lens to your smartphone, however, will let you see boring objects around your house and in a new way that your eyeballs can’t perceive on their own. Luckily, there are lots to ...
The exposure compensation, called the bellows factor, is a dimensionless ratio that is applied to the relative aperture , resulting in the working f-number of the lens and extension tube combination. The precise reduction of the amount of light reaching the imaging plane can be calculated using the inverse square law formula.
The camera equation, or G#, is the ratio of the radiance reaching the camera sensor to the irradiance on the focal plane of the camera lens. [8] The maximum usable aperture of a lens is specified as the focal ratio or f-number, defined as the lens's focal length divided by the effective aperture (or entrance pupil), a dimensionless number. The ...
A couple of later Minolta lenses do have a built-in ultrasonic focus motor (SSM lenses), like other SLR and DSLR systems (i.e. Canon and Nikon), where the AF computer is inside the camera body and there is a digital interface connecting body to an electric motor and the focusing gears built into the lens body.
In the same lens, the focal range will depend upon the size of the diaphragm used, while in different lenses having the same apertal ratio the focal ranges will be greater as the focal length of the lens is increased. The terms 'apertal ratio' and 'focal range' have not come into general use, but it is very desirable that they should, in order ...