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Carl Zeiss
Lightweight Zoom LWZ.2
Mount Change Instructions
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A | Introduction
Congratulations on the purchase of the Lightweight Zoom LWZ.2 lens. We are
convinced that your new lens will bring you much pleasure and success.
This zoom lens is the first on the market to combine outstanding optical image quality
with an interchangeable mount. The LWZ.2 is a cine lens designed for use with
HDSLR as well as traditional cine cameras. The interchangeable mount guarantees
high flexibility for present and future use in any situation and for a wide range of
camera platforms. With the three different mounts available (PL, EF and MFT mount)
there is no need for adapter solutions anymore. Exotic glass materials and the T*XP
anti-reflex coating ensure a sharp, high resolution image that covers the entire
Super35 frame and perfectly matches the other ZEISS cine lenses.
In this manual we take a Lightweight Zoom LWZ.2 15.5-45mm/T2.6 with EF mount,
scaled in meter as an example to explain how to change the lens mount and the
subsequent matching of your lens to a DSLR camera. Proceed in the same sequences
to switch to any other LWZ.2 mount.
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B | Overview
General instructions
• The use of a T6 torque wrench with a torque of 0.4 Nm is strongly recommended.
This wrench can be purchased from Carl Zeiss (see appendix 3, page 11).
• Ensure that the environment is clean and free from dust so that no dust particles can
enter the lens during the adjustment.
• Smudges and fingerprints on the lens surface can be gently removed with a soft
brush and then with a dry and clean cotton cloth. The ZEISS lens cleaning kit will give
superior results and is highly recommended for this purpose.
• When matching the lens, ensure that the colored shims lie on top of each other in the
groove of the lens barrel and do not cover the screw holes. Please use for shimming
only the shim set for the Lightweight Zoom LWZ.2. It is highly recommended to
handle the shims carefully as they can easily kink or tear which makes them unusable.
General drawing
Lens Support Torx screw(s)
Silver EF mount
including threaded
black inner ring
Shim(s)Zoom stick
Groove
of the
lens barrel
Silver EF
adapter ring
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C | Changing from an EF
to a PL mount
1. Remove the lens rear cap.
2. Remove the torx screws of the silver EF mount with a T6 torque wrench and place
the mount and the screws on one side. The size of the black inner ring is securely
fastened to the EF mount at the factory.
3. Remove the torx screws of the silver EF adapter ring and place the ring and the
screws on one side.
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4. Now you see the colored shims in the groove of the black lens barrel.
5. Important note: Please do not remove the screws which are beneath the colored
shims. This would end in a readjusted lens.
6. Now place the PL mount on the lens in such a way that the groove on the
underside of the PL mount fi ts over the silver screw on the lens barrel. Tighten the
torx screws with the T6 torque wrench using a torque of 0.4 Nm.
7. When the torx screws have been tightened, the lens can be fi tted to a camera
and used.
8. Check the fl ange focal distance of the lens (see section D) in combination with
your camera.
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D | Adjusting the LWZ.2
to a camera you use
As the flange focal distance varies from camera to camera, it is necessary to adjust
the LWZ.2 lens to the camera used when changing the mount or camera model
(=shimming). In order for you to be able to do this, Carl Zeiss provides colored shims
in different thicknesses to make the process of adjusting the lens to the camera easier
for you.
When the mount has been unscrewed, these shims can be placed in a groove in the
lens barrel. Any possible combination of shims can be used to achieve the required
thickness and therefore the required flange focal distance. The lens already contains
shims when delivered. Please use for shimming only the shim set for the Lightweight
Zoom LWZ.2. It is highly recommended to handle the shims carefully as they can
easily kink or tear which makes them unusable.
ȴ Carl Zeiss recommends that the camera is set to the usual standard settings
(cf. works settings). You can obtain further details from the instruction manual
of the camera you use.
Procedure
In the following chapter we explain how to adjust your Lightweight Zoom LWZ.2 lens
to a DSLR camera.
1. Fasten the Carl Zeiss test chart on a wall at 1.5m (=1500mm, 5 ft) distance and
ensure that the lighting is bright and uniform.
2. Mount the camera and lens on a tripod and level the camera, making sure that
the centre of the image is aligned with the centre of the Siemens star.
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3. Activate the live view of your camera.
4. Set the distance of 1.5m on the lens focus ring and use the zoom level at 45mm.
This setting must not be changed during the adjustment process.
5. Set the largest aperture of T 2.6 on the aperture ring.
6.
Obtain maximum image sharpness on the live view by varying the distance
between the test chart and the camera. Set the live view to maximum
magnifi cation in order to obtain the highest level of precision when checking
image sharpness.
7. Now re-measure the distance between the image plane mark on the camera body
and the test chart (= the actual distance).
8. If the distance has changed, the fl ange focal distance of the lens must be
adjusted by using the colored shims.
9. You fi nd the differences between the actual and the theoretical distance to the
test chart in the appendix (page 10) to calculate the resultant change in the
fl ange focal distance.
10. Now remove the lens from the camera after you have defi ned the number and
thickness of the shim(s) needed.
11. Remove the EF mount and EF adapter ring from the lens barrel (cf. section C 2-4).
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12. Change the shims as indicatedin the tables in the appendix (page 9) by using
a flat-bladed screw-driver or a pair of tweezers.
13. Please lign up the EF mount with the EF adapter that the four screw holes are
lying upon each other.
14. Now place them on the lens in such a way that the groove on the adapter ring is
facing to the index ring on the lens barrel. Tighten the screws of the EF adapter
ring and then the screws of the EF mount using a torque of 0.4 Nm. Please note
the different lengths of the torx screws to tighten the different LWZ.2 mounts:
ȴ EF and MFT mount: M 2 mm x 6 mm
ȴ PL mount: M 2 mm x 3.8 mm
15. Recheck the flange focal distance of the lens in combination with the camera you
use.
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E | Appendix
Table for shims to adjust a Lightweight Zoom LWZ.2 lens
when used on digital cameras
Shim color Thickness [mm]
silver 0.012
gold 0.019
purple 0.025
light blue 0.032
red 0.038
blue 0.051
white 0.064
green 0.076
orange 0.102
light purple 0.127
clear 0.152
clear matt 0.190
tint blue 0.203
Example
• Using a Lightweight Zoom LWZ.2 15.5-45mm/T2.6 with EF mount, scaled in meter
and a test chart at a distance of 1500 mm, an actual distance (object distance to best
focus) of 1530mm is measured. A light-blue shim 0.032mm thick must therefore be
added to the lens groove.
Note
• Any combination of shims is possible to achieve the required thickness and therefore
the desired flange focal distance.
• Always use the closest possible combination of shims.
Carl Zeiss AG reserves the right to make changes to the published specifications without prior notice.
All rights reserved. No part of this material may be reproduced, stored in retrieval systems, or transmitted, in
any form or by any means, electronic, mechanical, photocopy, recording or otherwise without the prior written
consent of Carl Zeiss. Copyright 05/2011, Carl Zeiss AG
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Tables for adjusting the flange focal distance
of a Lightweight Zoom LWZ.2 lens
Key
• Minus sign: Shims must be removed
• Plus sign: Shims must be added
Lightweight Zoom LWZ.2 15.5-45mm / T2.6
Please note: This table is only valid for the zoom level of f=45mm.
Meter distance scale Feet distance scale
Focal length setting [mm]: 45 Feet distance scale [mm]: 45
Distance to test chart [mm]: 1500 Distance to test chart [ft]: 5
Object distance
at best focus [mm]:
Change of total
shim thickness [mm]:
Object distance
at best focus [ft]:
Change of total
shim thickness [mm]:
1460 -0.04 4ft 10’ -0.04
1470 -0.03 4ft 10 1/2' -0.03
1480 -0.02 4ft 11' -0.02
1490 -0.01 4ft 11 1/2' -0.01
1500 0.00 5ft 0' 0.00
1510 +0.01 5ft 1/2' +0.01
1520 +0.02 5ft 1' +0.02
1530 +0.03 5ft 1 1/2' +0.03
1540 +0.04 5ft 2' +0.04
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Lightweight Zoom LWZ.2 – Accessories and spare parts
Accessories/spare parts Carl Zeiss
Ident-No.
Interchangeable Mount Set PL 1867-925
Interchangeable Mount Set EF 1867-926
Interchangeable Mount Set MFT 1893-185
Carl Zeiss LWZ.2 Transport Case 1890-874
Front Lens Cap EF/PL/MFT 0097-227
Rear Lens Cap EF 1793-167
Rear Lens Cap PL 102160-0052-000
Rear Lens Cap MFT 1889-118
Torx torque wrench (T6, torque moment 0,4 Nm) 0520-065
Carl Zeiss test chart 1849-755
Colored Shims LWZ.2 (Set) 1855-032
Technical Information
Focal length range 15.5 - 45 mm
Focal length ratio 3 : 1
Aperture T2.6 – T22
Number of aperture blades 9
Close focus 0.45 m / 18 inches
Angle of focus rotation 337°
Angle of zoom rotation 120 °
Pitch of the follow focus gears m 0.8 / number of pitches Z=112
Angle of views (for Super 35)
ȴ hoizontal:
ȴ vertical:
ȴ diagonal:
at 15.5 mm: at 45 mm:
77.0° 32.6°
61.2° 24.9°
90.2° 39.9°
Front diameter 114 mm / 4.5”
Length (Front – PL mount flange) 209 mm / 8.2”
Weight around 2000 g / 4.4 lbs
Lens Coating Carl Zeiss T* XP coating
Coverage ANSI Super 35 image area (24.9 x 18.7 mm / 0.98” x 0.7362”)
Camera mounts PL mount; EF mount; MFT mount
EN_10_070_718I Printed in Germany CZ-IV/2011
Subject to change.
For further information, please contact us:
Carl Zeiss AG
Camera Lens Division
73446 Oberkochen
Germany
cine@zeiss.de
www.zeiss.com/cine
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