Leica TRI-ELMAR-M 16-18-21 mm f/4 ASPH. specs

Angle of view (diagonal, horizontal, vertical)

for 35 mm (24 x 36 mm):
at 16 mm: 107°, 97°, 74°
at 18 mm: 100°, 90°, 67°
at 21 mm: 92°, 81°, 60°
for digital (18 x 27 mm):
at 16 mm: 90°, 80°, 59°
at 18 mm: 84°, 74°, 53°
at 21 mm: 75°, 65°, 46°, corresponds approx. to a focal length of 21/24/28 mm with 35 mm-format

Optical design
Number of elements / groups: 10 / 7

Distance setting

Focusing range: 0.5 m to Infinity, range from 0.5 to 0.7 m separated by index
Scales: Combined meter/feet graduation with uniform grey figures below 0.7 m
Smallest object field:
for 35 mm:
at 16 mm: 915 x 1373 mm, approx. 1:38
at 18 mm: 833 x 1250 mm, approx. 1:35
at 21 mm: 725 x 1087 mm, approx. 1:30
for digital:
at 16 mm: 688 x 1032 mm, approx. 1:38
at 18 mm: 626 x 939 mm, approx. 1:35
at 21 mm: 545 x 817 mm, approx. 1:30
Highest reproduction ratio: at 0,7 m
at 16 mm: 1:38
at 18 mm: 1:35
at 21 mm: 1:30

Aperture

Setting / Function: Preset, with click-stops, half values available
Lowest value: 22

Bayonet
Leica M quick-change bayonet with 6 bit lens identification bar code for digital M models

Filter (type)
Male thread, non-rotating and with stop for filter holder or lens hood

Lens hood
Screw-on type lens hood (included in delivery), filter holder for E67 size filters optionally available.

Dimensions and weight

Length: approx. 62/72 mm (with/without lens hood)
Largest diameter: approx. 54 mm (53 x 58 mm with lens hood)
Weight: approx. 335 g