CHINA MAGNETS SOURCE MATERIAL LIMITED can customize PERMANENT MAGNET for ND FILTER.
The magnet in ND filter is to help hold the filter in place.
Usually, it's hard to make big thin ring magnet for filter with diameter 77mm and 82mm.
But we can make segment magnet and shape the ring.
If you have such need, please email us.
1. APPLICATIONS: Polarizing filter/ color filter/ Neutral density filter/ HD Variable ND Fader
2. MATERIAL: Sintered NdFeB Magnet
3. GRADE: N35 N38 N40 N42 N45 N48 N50 N52 N30M N33M N35M N38M N40M N42M N45M N48M N50M N30H N33H N35H N38H N40H N42H N45H N48H N30SH N33SH N35SH N38SH N40SH N42SH N45SH N28UH N30UH N33UH N35UH N38UH N40UH N28EH N30EH N33EH N35EH N38EH
4. COATING: black epoxy, Zn, NiCuNi
5. MAGNETIZATION DIRECTION: through thickness
6. SHAPES AND SIZES: disc, ring, segment or according to customers' request
precise tolerance and dimension with good performance