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PC-SUPER-ANGULON
28 mm f/2.8
User Manual
Schneider Optics Inc .
285 Oser Avenue
Hauppauge · NY ¡¡788 · USA
Phone 63¡ .76¡ .5000
Fax 63¡ .76¡ .5090
info@schneideroptics .com
www .schneideroptics .com
Exclusive distributor for the USA
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2 List of Contents Name of Parts and Cross Section of the Lens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 . . . General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 . . . . . . . Perspective Correction for Analog and Digital Photos . . . . . . . . . . . . . . . . . 6 . Large Image Circle for Lens Shifts up to ¡¡ mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 . . . Fixing
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Name of Parts and Cross Section of the Lens Focusing ring PC-SUPER-ANGULON Distance scale Depth of field scale Aperture scale 1 1,25 1,5 2 3 5 0,3 0,35 0,4 0,5 0,7 1 3 Aperture setting ring 2216 8 4 2,8 4 5,6 8 Pre-set aperture setting lever Shifting knob Index Knurled ring Camera mount Fixing screw for camera mount
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1,25 1,5 2 3 5 oo 0,35 0,4 0,5 0,7 1 3 m 2216 84 48 1622 2,8 4 5,6 8 11 16 22 1,25 1,5 2 3 5 oo 0,35 0,4 0,5 0,7 1 3 m 2216 84 48 1622 2,8 4 5,6 8 11 16 22 General Description The SCHNEIDER PC-SUPER-ANGULON 28 mm f/2 .8 is a very high-quality wide-angle lens for 35 mm analog and digital SLR cameras and provides a parallel shift facility like the sliding lens panel of professional large-format cameras for correcting converging vertical lines and for manipulating the perspective especially f
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General Description Vertical shift is the most popular: upward, especially when photographing high buildings, so that the camera does not have to be tilted upward; and downward for product shots at an oblique angle or also for shots from high locations such as towers or mountains so that the camera does not have to be tilted downward . When the camera is tilted either upward or downward, perpendicular lines are not imaged as perpendicular, but rather converge upward or downward, which is
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1,25 1,5 2 3 5 0,35 0,4 0,5 0,7 1 3oo m 2,8224165,8648481116126222 0,35 1,250,4 1,50,5 20,7 31 53oo m 2216 84 48 1622 2,8 4 5,6 8 11 16 22 6 Perspective Correction for Analog and Digital Photography The equalizing of converging lines or of unfavorable perspective due to a camera location made necessary by obstacles, reflections or danger, e .g . traffic, is not only interesting for conventional analog photography, but also for digital photography when higher quality demands are made . While d
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0,35 1,205,4 1,50,520,7 31 53oo m 2216 84 48 1622 2,8 4 5,6 8 11 16 22 Perspective Correction for Analog and Digital Photography es the sharpness, produces just visible bluish violet or reddish brown color fringes at edges which have been made perpendicular under fairly high en- largement and gives an image with incorrect proportions (width-to-height ratio) . Since the final image must, however, be rectangular, the triangular ar- eas projecting on two sides have to be cut off, which shows ho
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8 Large Image Circle for Lens Shifts up to 1¡ mm The PC-SUPER-ANGULON 28 mm f/2 .8 already produces an exceptionally flattened image at full aperture within the 62 mm image circle which is thus twice as large in area relative to the image circles of other 35 mm lenses . Sharpness and contrast are increased further in the central area used with- out shift by stepping down slightly to f/4 to f/5 .6 . Sharpness, contrast and brightness naturally drop outside this area due to the huge image angl
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I m a I g m e a g e c i c i r r c c Large Image Circle for Lens Shifts up to 1¡ mm entation can always be chosen, e .g . irrespective of the shift direction with the knob at the bottom with free hands, or rather at the top at the tripod . With a shift to the left or to the Natural size right, the shifting knob can always max. ¡¡ mm be at the left so that the right hand can hold the camera and max. remain on the ¡0.5 mm release button . With a diagonal shift, the adjust- max. ment
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¡0 Fixing and Removing the Lens The lens is available in a connection socket to match different 35 mm SLR camera systems and is inserted into the camera bayonet or thread for fas- tening to the camera such that the red dot on the connection socket is op- posite the corresponding marking on the camera . To lock the lens in the bayonet or thread and to release it again, the lens should be rotated at the knurled ring and not at the tube since the latter is not rigidly connected to the bayonet o
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Parallel Shift ¡1 The lens is shifted perpendicular to the optical axis relative to the bayonet mount and so also relative to the taking format by rotating a knurled shift- ing knob at a shaft which is elastically flexible to protect against its damage or injury to the user . The lens tube can be rotated continuously to the left or the right in a rotary mount so that the parallel shift can be made in any desired direction . It is best to grip the lens at the flattened part with the millimet
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¡2 Focusing and Depth of Field The focusing of wide-angle lenses appears to be relatively non-critical due to their large depth of field . However, careful focusing is actually necessary to utilize the high imaging quality of this lens to the full . To ensure maxi- mum brightness of the focusing screen and the best recognition of the ide- al focusing point, the aperture should be opened by pivoting the stopping- down lever toward the shifting knob . The aperture setting ring therefore remains
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Measuring the Exposure ¡ If the measurement is not carried out using a separate hand exposure me- ter, but using the TTL exposure meter integrated in the camera, it is neces- sary to measure in the centered position of the parallel shift while stop- ping down to the working aperture because the arrangement and align- ment of the measuring cell of almost all SLR cameras requires a direction of light incidence axially symmetrically to the lens bayonet . With an oblique incidence through the len
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¡ Filters, Lens Hood and Camera Mounts Only the oversized B+W WA filters of the size 67 EW can be used with the SCHNEIDER PC-SUPER-ANGULON 28 mm f/2 .8 due to the extreme- ly large image angle utilized at maximum shift up to 93 .4° . The following table sho ws the order numbers of the most popular filter types – further types are available . The two B+W polarization filters shown there (linear and circular) have a special rotary mount and are dimensioned such that they do not produce vigne
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Filters, Lens Hood and Camera Mounts ¡ Wide-angle filters of size 6 EW Order no. B+W UV Filter with MRC coating . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40295 . . . B+W Skylight filter MRC coating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14386 . . . B+W Käsemann linear polarizing filter . . . . . . . . . . . . . . . . . . . . . . . . 75246 . . . B+W Käsemann circular polarizing filter with MRC coating . . . . . . . . 16518 More Filters of size 67 EW on
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¡6 Specifications Relative aperture . . . . . . . . . . . . . . . . . . . . . . .¡ : .2 . .8 Effective focal length . . . . . . . . . . . . . . . . . . . . .29 . .2 mm Nodal point separation HH' . . . . . . . . . . . . . . .57 .9 mm Optical design . . . . . . . . . . . . . . . . . . . . . . . . . .¡2 . .lenses in ¡0 groups Near distance correction . . . . . . . . . . . . . . . . . Flo . ating elements Image circle diameter . . . . . . . . .
