The NI supplementary lens allows focusing between 38¼ in. and 17¾ in. and at these distances the field
covered is 26 3/8 x 17 1/2 in. and 11¼ x 7½ in. respectively. The N2 lens allows focusing between 20 in and 13
3/8 in. and again at these distances covers a field of 12¾ x 8½ in. and 7+ )( 41 in. respectively. Mounted
together. even closer distances can be focused, from 14 7/8 in. to 11 5/8 in. Here the field covered is 8 5/8 x 5
3/4 in. and 5 3/4 x 3 7/8 in. respectively.
For ultra close-up work three supplementary R lenses are available (not available for f1.9 lenses). RI:4.5 gives
an approximate scale of reproduction of 1:4.5 and covers a field of 6x4¼ in. RI:3 gives an approximate scale of
reproduction of 1:3 and covers a field of 4 1/8 x2 3/4 in. RI:2 gives an approximate scale of reproduction of 1:2
and covers a field of 2 3/4 x 1 7/8 in. RI:4.5 combined with RI:2 gives an approximate scale of reproduction of
1:1.5 and covers a field of 2 x 1 3/8 in.
CLOSE-UP EQUIPMENT
Left: The Retina copying outfit consists of a camera holder
with extendible legs and incorporates its own lighting unit. It
is used with the N2 supplementary lens and covers two field
sizes.
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