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15

EN

STRUCTURE OF THE LENS

In the Leica Thambar-M 90 f/2.2, the rotating front part of the lens mount 

contains the aperture setting ring (3), the knurled gripping ring for distace 

setting (4) and the aperture (3b) and distance scales (4a). The index for distance 

setting (5), the depth of field scale (6) and a red dot for lens change (7) are 

located on the fixed rear part of the lens mount. A 6 bit lens identification bar 

code (8) is situated on the bayonet flange. It relays lens data to the camera 

body so the exposure metering system of digital Leica M models can be calibrat-

ed. The information is also used to custom-optimize image data according to the 

respective lens.

USE WITH/WITHOUT CENTER SPOT FILTER

Due to its special optical properties, the degree of soft-focus of the Leica 

Thambar-M 90 f/2.2 can be controlled to a certain extent. Without the center 

spot filter (2) supplied, this is done only with the aperture; the scale with the 

white values applies in this case. When the aperture is open, the soft focus 

effect is very marked; with aperture values of around 9 and higher, the lens 

provides its highest contrast reproduction. This is due to the fact that then only 

the central area of the lens with the best image aberration correction is used. 

An even greater soft focus effect can be achieved with the center spot filter sup-

plied: Since the opaque spot in the centre of the aperture blocks the central 

beam, the image is largely generated only by a ring of beams, and consquently 

only with the area of the lens that is primarily responsible for the soft focus 

effect. In this case, the aperture scales with the red values applies. The higher 

values of the larger apertures (in comparison to those on the white scale) take 

account of the light loss through the blocking of the central beam. This scale 

reaches only up to 6.3 since the simultaenous use of even smaller aperture 

Summary of Contents for THAMBAR-M 90 f/2.2

Page 1: ...Leitz Park 5 35578 WETZLAR DEUTSCHLAND Telefon 49 0 6441 2080 0 Telefax 49 0 6441 2080 333 www leica camera com 93794 I 18 LW D THAMBAR M 1 2 2 90 ANLEITUNG INSTRUCTIONS NOTICE D UTILISATION GEBRUIKSA...

Page 2: ......

Page 3: ...f entrance pupil at infinity 4 3 49 6 mm in the direction of light incidence behind the bayonet fitting contact area Focusing Focusing range Scale Smallest object field Biggest scale 1 m to Meter divi...

Page 4: ...hood Weight approx 90 110 mm approx 57 mm approx 500 g Compatible cameras All Leica M cameras1 3 1 Use with the Leica M8 models is not recommended since the optical properties do not suit for smaller...

Page 5: ...14 EN SPECIAL FEATURES Please visit the Leica Camera AG homepage for more information about the visual and technical details http us leica camera com...

Page 6: ...out the center spot filter 2 supplied this is done only with the aperture the scale with the white values applies in this case When the aperture is open the soft focus effect is very marked with apert...

Page 7: ...the rotating front part of the lens mount and consequently cannot be seen completely from above at all distance settings To protect against accidental missetting of the distance you should hold the fr...

Page 8: ...protection against contrast reducing stray light and also against damage and soiling of the front lens e g from accidental fingerprints ACCESSORIES E49 screw on filters can be used on the Leica Thamb...

Page 9: ...nges the bayonet has had an extremely thin coating of grease applied in the factory With normal use this condition lasts for many years even if the bayonet is wiped with a clean cloth from time to tim...

Page 10: ...t or the repair service provided by your regional Leica subsidiary for repairs or warranty claims Leica Camera AG Leica Customer Care Am Leitz Park 5 35578 Wetzlar Germany Phone 49 0 6441 2080 189 Fax...

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