Filter Holders
A filter holder is an instrument for setting and securing various filters used for optical experiments. There are various types, such as square or round filters that can be inserted from above to place multiple filters, leaf spring types that can also secure multiple filters, variable transmittance types with the ability to set a plurality of ND filters with different transmittance, and rotating, types with unified height of the optical axis from the bottom, types that can be used as a polarizing element holder, etc. Depending on the type of product, the appropriate filter size, thickness, application, etc. are different, so it is necessary to select an appropriate filter holder to prevent tilt and rattling during use. The main material is aluminum with black anodizing processing, and resin may be used in the area of contact with the filter.