35-80mm shim adjustment reference
35mm focusing
mark S2
（
m
）
Shim
adjustment
（
mm
）
80mm focusing
mark S1
（
m
）
70-135mm shim adjustment reference
135mm focusing
mark S1
（
m
）
70mm focusing
mark S2
（
m
）
Shim
adjustment
（
mm
）
1.5
1.5
1.2
1.3
1.4
1.5
1.6
1.4
1.45
1.5
1.55
1.6
1.65
+0.3
+0.13
0
-0.1
-0.22
-0.3
1.7
1.8
2
2.2
+0.3 +0.19 +0.12
0
-0.08 -0.13 -0.18 -0.23 -0.3
Note:
Shim adjustment: "+" means adding shims, and "-" decreasing shims.
1.5m
Maximum aperture
Set the object 1.5m away from
the camera sensor plane, and
adjust it to the center of the
whole image.
Φ
Rotate the focal length to 80mm, and focus till the image is at its sharpest, the focusing
distance mark is 1.5m (S1). And then rotate the zoom ring to 35mm, re-focus to the
image at its sharpest, current focusing distance mark is 1.4m (S2). S2<S1. According to
the sheet below, add 0.12mm shims on the lens mount and double check. At this time,
both 35mm and 80mm focus at the closest under 1.5 focus mark. That means this lens is
under parfocal.
Take CATTA ACE zoom 35-80mm as an example
：
5
Summary of Contents for CATTA
Page 1: ...CATTA ACE Zoom Lens User s Manual 70 135mm T2 9 T22 35 80mm T2 9 T22 www dzo lm com ACE...
Page 11: ...1 2 1 1 2 3 4 4 4 6 7 8...
Page 12: ...ACE CATTA ACE DZOFILM MV 1...
Page 13: ...10 M3 3mm 6 7 8 9 1 2 3 4 5 2...
Page 14: ...3...
Page 15: ...4 1 2 ACE 1 2 S2 S1 1 5 S1 S2 S2 S1 S2 S1 S2 S1 S1 S2 DZOFILM...
Page 18: ...7 5 DZOFILM DZOFILM...
Page 19: ...GB T26572 SJ T11364 RoHS 2011 65 EU GB T26572 Pb Hg Cd Cr VI PBB PBDE 8...
