Exposures with the Interchangeable Lenses
With the interchangeable lens units you use the same exposure value settings of the exposure meter as with the
standard lens. Watch that you do not use lower aperture values (larger apertures) than the maximum aperture
of the lens unit employed. With the f4 telephoto and wide-angle lens units, the aperture on the camera must not
be used wider open than f4, and the alternative f5.6 wide-angle lens unit must not be used with the aperture on
the camera wider than f5.6.
RETINA REFLEX ACCESSORIES
Close-Up Lenses
While the Retina Reflex normally focuses down to 3 ft. (90 cm.), one can work at still shorter distances with the
aid of the Retina supplementary lenses. Separate lens diameters are available for f2.8 (f2 on earlier Retina
Reflex) and f1.9 lenses.
Two different lenses are available.
The Retina Supplementary Lens N1 (featuring mark: one ring around the circumference) for distances between
38¼ and 18 in. (90 to 46 cm.) covering a subject field from 17½x26¾ in. to 8½x12¾ in. (45 x 68.5cm.to
21.5x32.5 cm.).
The Retina Supplementary Lens N2 (featuring mark : two rings around the circumference) for distances between
20 and 12 in. (50 to 30 cm.) covering a subject field from 8½x12¾ in. to 4 1/8 x 6 1/8 in. (21.5x32.5 cm. to
10.5x 15.5cm.).
N1 and N2 lenses can be used together (by screwing them into each other) for distances between 14 7/8 and 12
in. (37.5 to 30 cm.) covering a field from 5 3/4 x8 5/8 in. to 4 1/8 x 6 1/8 in. (14.5x22 cm. to l0.5x15.5 cm.).
For ultra close-ups three two-element colour corrected, coated, supplementary R lenses, mounted in metal
screw-in mounts, are designed for photographs at four fixed distances between 11 and 6 in. The R lenses are
only available for use with f2.8 lens of the Retina Reflex III and S. They also fit the f2 lens of earlier Retina
Reflex models.
Lens R1:4.5 gives an approximate scale of reproduction of 1:4.5 covering a field of 4¼ x 6 in. (11 x 15.5 cm.).
Lens R1:3 gives an approximate scale of reproduction of 1:3 covering a field of 2 3/4 x 4 1/8 in. (7 x 10.5 cm.).
Lens R1:2 gives an approximate scale of reproduction of 1:2 covering a field of 1 7/8 x 2 3/4 in. (4.75 x 7 cm.).
Lens R1:4.5 combined with lens R1:2 gives an approximate scale of reproduction of 1:1.5, covering a field of 1
3/8x2in.(3.5x5cm.).
Close-up lenses screw over the standard lens. The reflex ground glass screen of the camera shows the exact
image covered free from parallax, and the picture can be focused in the same way as without a close-up lens.
At full aperture the definition falls off slightly, especially towards the corners, and the camera lens should be
stopped down to about f5.6 in the case of the N lenses and to f8 when using the R close-up lenses to regain full
edge definition. No change of exposure time is required.
The depth of field when working at close range with the supplementary lenses is obviously rather limited. The
table on p.68 gives the extent of the depth to be expected for close-up work.
CLOSE-UP LENSES
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