The Heliopan 67mm ND 0.45 SH-PMC Center Filter helps to compensate for light falloff by providing 1.5 stops of concentric graduated neutral density in the center of the filter that tapers off to clear by the edges in order to produce even overall exposure with large format wide-angle lenses.
Constructed using high quality Schott glass, this filter helps to maintain high optical clarity and contrast to help render scenes with greater fidelity and resolution. The SH-PMC multi-coating provides a total of 16 coatings, 8 per side, for significant reflection reduction (below 0.2%) as well as dust and moisture repellence for easier cleaning.
The durable brass ring fits lenses with 67mm mounting threads and features an oversized front thread diameter of 86mm to further prevent vignetting.