FAQ/THREAD PITCH

sur May 24, 2024

As a photographer, it's crucial to ensure that the filters you purchase are compatible with your lenses. One key factor to consider is the thread pitch, which determines whether a filter will properly screw onto your lens. 

 

What is Thread Pitch?

Thread pitch refers to the distance between the threads on a screw or, in this case, the lens filter thread. It is typically measured in threads per inch (TPI) or threads per millimeter. The thread pitch must match between the lens and the filter for them to be compatible. Most modern camera lenses and filters use a standard thread pitch of 0.5mm (20 TPI). However, some older lenses or specialized filters may have different thread pitches, such as 0.75mm (16 TPI) or 0.625mm (24 TPI). 

 

Why is Thread Pitch Important?

Using a filter with the incorrect thread pitch can lead to several issues: 

  1. Cross-threading
    If you try to force a filter with the wrong pitch onto your lens, you risk cross-threading, which can damage both the lens and the filter.

  2. Improper seating
    Even if you manage to screw on a filter with the wrong pitch, it may not seat properly, leading to light leaks, vignetting, or other optical issues.

  3. Difficulty removing
    A filter with the wrong pitch may become stuck on your lens, making it challenging to remove without damaging the equipment.

Marumi Filter Thread Pitch

Marumi's filter lineup typically follows the ISO standard described Values with millimeters below.

Screw thread A
major diameter 
pitch Basic size Tolerance
Upper deviation
Tolerance
Lower deviation
13.5 0.5 15 0 -0.18
16.5 0.5 18 0 -0.18
19.5 0.5 21 0 -0.21
22.5 0.5 24 0 -0.21
25.5 0.5 27 0 -0.21
30.5 0.5 32 0 -0.25
35.5 0.5 37 0 -0.25
40.5 0.5 42 0 -0.25
43 0.75 45 0 -0.25
46 0.75 48 0 -0.25
49 0.75 51 0 -0.30
52 0.75 54 0 -0.30
55 0.75 57 0 -0.30
58 0.75 60 0 -0.30
60 0.75 62 0 -0.30
62 0.75 65 0 -0.30
67 0.75 70 0 -0.30
72 0.75 75 0 -0.30
77 0.75 80 0 -0.30
82 0.75 85 0 -0.35
86 1.0 90 0 -0.35
95 1.0 100 0 -0.35
100 1.0 105 0 -0.35
112 1.0 117 0 -0.35
122 1.0 127 0 -0.35

ISO1948:1987(en)
Photography: Front lens barrels up to 127 mm Dimensions important to the connection of auxiliaries

 

Conclusion

Understanding thread pitch is crucial for ensuring that your lens filters are compatible with your camera lenses. By matching the correct thread pitch, you can avoid potential damage to your equipment and ensure optimal performance from your filters. When shopping for filters, always verify the thread pitch specifications to ensure a perfect fit and seamless integration with your photography gear.

Thank you for your attention!

Marumi Team

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