Hoya NDX400 Screw-in Filter - 52mm

ND stands for Neutral Density. A Neutral Density filter reduces light evenly across the visible spectrum without affecting color balance.

The NDx400 filter reduces light by approximately 9 f-stops.

Yes, this filter is suitable for video recording, especially when you need to achieve motion blur or use wider apertures in bright daylight.

In very low light conditions caused by the filter, autofocus *may* struggle. However, in the bright conditions where this filter is typically used, autofocus performance should generally be unaffected.

No, this filter is designed to reduce light for bright conditions. It is not suitable for astrophotography, which requires maximizing light capture.

Use a clean, soft microfiber lens cloth. For stubborn spots, apply a dedicated lens cleaning solution to the cloth (not directly to the filter) and wipe gently.

While it is possible to stack filters, doing so with an NDx400 might cause vignetting (darkening at the corners of the image), especially on wider-angle lenses. It's generally recommended to use it on its own unless absolutely necessary.

Ensure you are using the correct filter size (52mm). Check for any debris or damage on the lens threads or filter threads. Gently try again, do not force.

Verify the filter is securely attached. Ensure the camera's exposure settings are compensating for the significant light reduction (e.g., increase shutter speed or ISO if intended).

Clean the filter surface thoroughly with a microfiber cloth. Ensure no strong light sources are directly entering the lens at an angle that could cause internal reflections.

While the HMC coating minimizes color cast, extreme densities can sometimes introduce a subtle hue. Adjust white balance in post-processing or use custom white balance settings.