GTX Penflex 40.5mm CPL Filter ND Filter and a maximum aperture of

and a maximum aperture of F2

It provides a marked sonic improvement to video recordings

Advanced optics deliver excellent sharpness right out to the image edges

Useful with all types of lights

and lightweight DSLR camera

GTX Penflex 40.5mm CPL Filter ND Filter and a maximum aperture ofPenflex Circular Polarizers (CPL) are manufactured from Glass with Polarizing materials incorporated. The rings are metal, and feature a male thread which screws into the filter, and a female thread on front to accept lens hoods, other filters, or accessories. Once attached to a lens, the front ring of the polarizer rotates and may be adjusted for maximum effect. This is typically done by looking through the viewfinder while turning the front ring on