Leica Tri-Elmar-M 16-18-21mm f/4.0 ASPH

Angle of view (diagonal, horizontal, vertical)
for 35 mm and M9 (24 x 36 mm)	at 16 mm: 107°, 97°, 74° at 18 mm: 100°, 90°, 67° at 21 mm: 92°, 81°, 60°
for digital M8/M8.2 (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 full frame 35mm	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 M8 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