APM Polarizing filter 1 1/4"
This filter can be screwed into 1 1/4" eyepieces and can be used for individual light attenuation in combination with Herschel solar prisms. Turning the filter alters the brightness. (A Herschel prism polarises the light)Delivery contains:
APM - Polarizing filter 1 1/4" for the futher regulation of light transmission at solar observing.