Because Canon reduced the flange focal distance from that of its EOS DSLR line, the mount was altered so that EF and EF-S lenses cannot mount directly on EF-M bodies.
42.
K-mount cameras have a suitable flange focal distance ( 45.46 mm ) to adapt old M42 lenses without any optical correction or loss of infinity focus / changed close focus distance.
43.
A major issue is the fact that the Kiev 88 has a greater flange focal distance than the Pentacon Six, requiring the lens to be recessed into the front of the modified Kiev 88.
44.
On large format view cameras and rangefinder cameras, short-focus lenses are widely used because they give less distortion than the retrofocus design and there is no need for a long back focal distance.
45.
Following the introduction of the EOS camera line, whose EF lens mount has a 44 mm flange focal distance, Canon briefly marketed an adapter which enabled certain FD telephoto lenses to be used on EOS bodies.
46.
In this case, simple explicit formulae can be given for parameters of an imaging system such as focal distance, magnification and brightness, in terms of the geometrical shapes and material properties of the constituent elements.
47.
Although C-mount lenses have a back focal distance far too short to be used with 35 mm film SLRs or any existing digital SLR, they can be mounted on interchangeable-lens mirrorless digital cameras.
48.
Visually the genre is characterized by diffuse high-key images which flatter the appearance of skin, short focal distances, and shallow depth of field, which together impart an intimate, " dreamy " mood.
49.
In fact, almost any still camera, movie or video camera interchangeable lens that has a flange focal distance greater than or marginally less than 20 mm can often be used on MFT bodies via an adapter.
50.
In contrast with spherical reflectors, which suffer from a spherical aberration that becomes stronger as the ratio of the beam diameter to the focal distance becomes larger, parabolic reflectors can be made to accommodate beams of any width.
