Above: The interchangeable lenses greatly increase the versatility of the Retina Reflex cameras. The wide-angle
lens (top left and centre) covers a large angle of view as compared with the standard lens (bottom left). The tele
lenses on the other hand include a much narrower angle and show distant subjects larger (right).
To remove the lens of the Retina III or S press the catch below the lens barrel, and turn the milled lens
mounting ring anti-clockwise to lift out the lens. To insert an alternative lens, place it in position with the red dot
on the lens opposite the red dot on the camera mount. Then turn clockwise to let the bayonet catch engage.
Changing Lenses
To remove the lens of the Reflex III and S, depress the lens lock underneath the lens barrel and at the same
time turn the lens fully anti-clockwise. Then lift out.
To insert a lens, place it in position with the red dot on the lens mount against a similar red dot on the bayonet
ring of the shutter. Now turn the lens clockwise until the catch engages.
Focusing and Depth of Field
After changing the standard lens against the wide-angle or telephoto units, the image is focused on either the
ground glass screen or with the split-image rangefinder in the same way as with the standard lens. At the same
time, the reflex screen shows the exact field of view of the particular lens used. There is no parallax error nor
are any supplementary viewfinders required.
The tele and wide-angle lenses for the Retina Reflex IV, III and S have their own depth of field indicator pointers
which show directly the extent of the sharp zone at all settings.
Close-ups with the Tele Lenses
The 135 mm. lenses can also focus on distances nearer than 14 ft. For this purpose a TII/60 supplementary is
used for close-ups between about 13 and 7 ft., and a TI/60 lens for distances between 6½ and 4¾ ft. A TI/32
supplementary lens in the same way covers near distances from 6 to 3½ ft. with the 85 mm. tele lenses.
THE RETINA REFLEX LENS SYSTEM
The earlier Retina Reflex has a convertible lens system with an interchangeable front component which can be
replaced by various alternative front components for different focal lengths.
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