| C-Mount
Extension Rings |
 |
|
Use
the table below to determine the effect a particular extension
tube set will have on your chosen lens.
Please note that there may be slight differences between
the quoted figures when using different manufacturers
lens models. If in any doubt, please contact us and we
will be happy to assist with this or any oter machine
vision problem you may have.
Phone for exact details of which ring or ring-set you
require. |
|
|
|
Extension Tube Length
|
Focal Length of Lens
|
|
6.5mm
|
16mm
|
25mm
|
50mm
|
75mm
|
|
Field of View
|
WD
|
Field of View
|
WD
|
Field of View
|
WD
|
Field of View
|
WD
|
Field of View
|
WD
|
|
h: mm
|
v: mm
|
mm
|
h: mm
|
v: mm
|
mm
|
h: mm
|
v: mm
|
mm
|
h: mm
|
v: mm
|
mm
|
h: mm
|
v: mm
|
mm
|
|
Without any extension
|
231.8
|
168.9
|
200.0
|
125.8
|
93.2
|
300.0
|
65.2
|
48.5
|
250.0
|
59.1
|
44.7
|
500.0
|
38.6
|
28.8
|
500.0
|
|
0.5 mm: far
|
96.2
|
69.7
|
76.0
|
222.7
|
165.2
|
531.0
|
334.1
|
250.0
|
1258.0
|
665.2
|
499.3
|
5050.0
|
973.5
|
730.3
|
10767.0
|
|
0.5 mm: near
|
68.2
|
49.2
|
52.0
|
80.3
|
59.2
|
192.0
|
54.5
|
40.9
|
211.0
|
54.5
|
40.9
|
463.0
|
37.1
|
28.0
|
483.0
|
|
1.0 mm: far
|
47.7
|
34.8
|
32.0
|
111.4
|
82.6
|
265.0
|
167.4
|
125.0
|
633.0
|
332.6
|
249.3
|
2552.0
|
486.4
|
365.2
|
5419.0
|
|
1.0 mm: near
|
40.2
|
28.8
|
25.0
|
59.1
|
43.9
|
141.0
|
47.0
|
34.8
|
182.0
|
50.8
|
37.9
|
432.0
|
35.6
|
26.5
|
468.0
|
|
1.5 mm: far
|
|
|
|
74.2
|
55.3
|
177.0
|
111.4
|
83.3
|
424.0
|
222.0
|
166.7
|
1719.0
|
324.3
|
243.2
|
3637.0
|
|
1.5 mm: near
|
|
|
|
47.0
|
34.8
|
111.0
|
40.9
|
31.1
|
161.0
|
47.0
|
34.8
|
406.0
|
34.1
|
25.8
|
454.0
|
|
5.0 mm: far
|
|
|
|
22.0
|
16.7
|
53.0
|
33.3
|
25.0
|
132.0
|
66.7
|
50.0
|
553.0
|
97.0
|
72.7
|
1141.0
|
|
5.0 mm: near
|
|
|
|
18.9
|
13.6
|
45.0
|
22.0
|
16.7
|
90.0
|
31.1
|
23.5
|
289.0
|
27.3
|
20.5
|
377.0
|
|
10.0 mm: far
|
|
|
|
|
|
|
16.7
|
12.9
|
70.0
|
33.3
|
25.0
|
303.0
|
48.5
|
36.4
|
607.0
|
|
10.0 mm: near
|
|
|
|
|
|
|
13.6
|
9.8
|
57.0
|
21.2
|
15.9
|
214.0
|
21.2
|
15.9
|
309.0
|
|
15.0 mm: far
|
|
|
|
|
|
|
11.4
|
8.3
|
49.0
|
22.0
|
16.7
|
220.0
|
31.8
|
24.2
|
428.0
|
|
15.0 mm: near
|
|
|
|
|
|
|
9.8
|
6.8
|
43.0
|
15.9
|
12.1
|
175.0
|
17.4
|
12.9
|
266.0
|
|
20.0 mm: far
|
|
|
|
|
|
|
8.3
|
6.1
|
39.0
|
16.7
|
12.9
|
179.0
|
24.2
|
18.2
|
339.0
|
|
20.0 mm: near
|
|
|
|
|
|
|
7.6
|
5.3
|
35.0
|
12.9
|
9.8
|
151.0
|
14.1
|
10.6
|
236.0
|
|
25.0 mm: far
|
|
|
|
|
|
|
|
|
|
13.6
|
9.8
|
154.0
|
18.9
|
14.4
|
286.0
|
|
25.0 mm: near
|
|
|
|
|
|
|
|
|
|
10.6
|
8.3
|
135.0
|
12.9
|
9.1
|
514.0
|
|
30.0 mm: far
|
|
|
|
|
|
|
|
|
|
11.4
|
8.3
|
137.0
|
15.9
|
12.1
|
250.0
|
|
30.0 mm: near
|
|
|
|
|
|
|
|
|
|
9.1
|
6.8
|
123.0
|
11.4
|
8.3
|
98.0
|
|
35.0 mm: far
|
|
|
|
|
|
|
|
|
|
9.8
|
6.8
|
125.0
|
13.6
|
9.8
|
225.0
|
|
35.0 mm: near
|
|
|
|
|
|
|
|
|
|
8.3
|
6.1
|
115.0
|
9.8
|
7.6
|
184.0
|
|
40.0 mm: far
|
|
|
|
|
|
|
|
|
|
8.3
|
6.1
|
116.0
|
12.1
|
9.1
|
205.0
|
|
40.0 mm: near
|
|
|
|
|
|
|
|
|
|
7.6
|
5.3
|
108.0
|
9.1
|
6.8
|
174.0
|
| *NOTE*
|
For
1/3" CCD cameras multiply the coverage figures
by 0.75 and for 2/3" CCD cameras multiply the
coverage by 1.375
For both 1/3" and 2/3" CCD cameras the
working distances remain the same |
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