- medium format cameras, lenses, accessories, services
Figure 3
1.
Focusing ring
2.
Distance scale
3.
Deep of field scale
4.
Aperture scale
5.
Aperture ring
6.
TS plate
7.
Tilt handle
8.
Tilt scale
9.
360
о
rotating ring
10. Shift handle
11. Shift scale
3. OPERATIONS INSTRUCTIONS
3.1. Lens installation on the camera and its removal
Install and remove the lens as it written in the camera’s operation manual.
3.2 Focusing
It is preferable to perform focusing at maximum aperture by rotating the focusing ring 1, on which focusing scale (distance) 2 is
marked. If focusing is required after tilting and shifting the optical block, then the microprisms or camera viewfinder wedges’ surface dim
out. In this case it is necessary to control image sharpness according to the screen’s matte area. The distance scale 2 can be used
instead to give an approximate focus.
During optical block tilting and shifting, decrease the aperture as far as possible, because unequal amounts of the light falls on the
edges and center of the field. It is recommended to use the aperture values from 16 to 22.
When focusing the lens after it has been shifted, it is possible that the microprism and the split-image rangefinder of the viewfinder
of the camera may darken. In that case, check the image sharpness on the matte spot of the focusing screen. Orientation based on a
distance scale after the lens has been shifted shall not give precise result.
3.3. Aperture operation
Manual aperture operation is provided for in the lens. Select the value by rotation of the ring 5, first pulling it aside along the optical
axis towards the camera. In the released condition rotate the ring 5 from set up value to the value 2,8. Before exposure do not forget to
rotate the ring 5 until the selected value of the aperture appears.
3.4. Lens shifting
While rotating handle 10, the lens is moving in parallel to the image surface. The lens can be rotated by 360
о
with settled interval
every 30
о
(the lens can operate even in the positions between these intervals). Due to the fact that the camera’s image is rectangular,
the limit degree of lens shift will be changing at every rotation. The maximal shift is possible at the settled position of the lens along the
image’s short side. Control this shift on the scale 11.
3.5. Lens tilting
While rotating tilting handle 7, the lens is tilting. Tilting depends from the direction of rotation of tilting handle 7. The lens can be
rotated by 360
о
with settled interval every 30
о
(the lens can operate even in the positions between these intervals). Due to the fact that
the camera’s image is rectangular, the limit degree of lens tilt will be changing at every rotation. The maximal tilt is possible at the
settled position of the lens along the image’s short side. Control this shift on the scale 9. Remember that it is recommended to set up the
tilt angle with the zero position of the shift.
Tilting during photographing, obey the Scheimpflug principal, which states that if a lens is tilted such that the lens plane intersects
the film plane, the plane of sharp focus must also pass through that same line of intersection like it shown on the scheme below.
