PR032
Linear Rotating Polarizing Filter
(with locking screw)

Used to eliminate glare, a linear polarizer in a rotating mount offers flexibility and ease of use. Once the filter is screwed to the lens, the outer portion of the mount rotates freely. This facilitates determining the point where reduction of glare (or the contrast in stress patterns in glass or plastic materials) is maximized. However, because the mount rotates freely, it is also possible for vibration or other inadvertent interference to cause the filter to move from this position and adversely effect the system's performance. For this reason, all MidOpt polarizers come with a locking thumbscrew to insure that jarring or accidental movement during cleaning does not result in a change in the filter's position.

MidOpt also offers linear polarizers in Slip Mounts to fit over the outside diameter of the front end of a lens and Quick Mounts to fit the inside diameter of the front of a lens. These mounts are usually employed when the lens does not have a filter thread. In both cases, the mount and filter can be easily positioned on the lens so that rotating mounts are unnecessary.

Example:

(left) Unfiltered monochrome image.
(right) Correctly aligned polarizing filter eliminates reflections.

More examples

Download Excel Spreadsheet with data and curve for this filter.

Standard Threaded Mounts:
We offer standard filter sizes from stock – 22.5mm to 62mm – for same- or next-day shipping. Larger filters – 67mm to 105mm – are made to order and are normally not returnable.

Click here for PDF drawing of standard mounts

Slip Mounts:
If your lens does not have threads for mounting a filter, Slip Mount adapters are available. Slip Mounts can attach a regular filter to a lens or attach a very large filter to accommodate a wide angle lens. Please call to order Slip Mount adapters.

C-Mounts:
3mm thick threaded mount for adding a filter between lens and camera
Click here for PDF drawing of c-mounts

Transmission chart (typical)
Passes visible (340nm+) and IR
Absorbs UV 200-340nm

Note: The polarization of light only takes place over the 400-700nm (visible) range; light in the UV or IR is not polarized.

1100
1090
1080
1070
1060
1050
1040
1030
1020
1010

1000
990
980
970
960
950
940
930
920
910

900
890
880
870
860
850
840
830
820
810

800
790
780
770
760
750
740
730
720
710

700
690
680
670
660

72.05
71.66
71.19
70.78
70.24
69.80
69.33
68.97
68.51
68.02

67.55
67.09
66.68
66.12
60.54
60.03
59.46
58.81
58.09
57.37

56.75
56.02
55.20
54.34
53.51
52.63
51.78
51.05
50.32
49.66

48.80
47.87
46.91
45.89
44.83
43.77
42.68
41.64
40.60
39.69

38.82
38.08
37.48
36.99
36.65

650
640
630
620
610
600
590
580
570
560

550
540
530
520
510
500
490
480
470
460

450
440
430
420
410
400
390
380
370
360

350
340
330
320
310
300
290
280
270
260

250
240
230
220
210

36.48
36.52
36.69
36.83
37.14
37.69
38.12
37.90
37.55
38.16

36.83
36.95
37.17
37.19
37.08
36.92
36.72
36.53
36.40
36.29

35.82
35.80
35.77
35.53
35.12
34.27
32.46
29.79
27.70
25.73

23.98
18.32
11.05
3.17
0.99
0.04
0.00
0.00
0.00
0.00

0.00
0.00
0.00
0.00
0.00