Urth Lens Filter - ND64 (6 Stop)

'ND' stands for Neutral Density, and '64' refers to the filter factor. An ND64 filter reduces light by a factor of 64, which corresponds to approximately 6 stops of light reduction.

Yes, you can stack this filter with other filters (like a polarizer), but be aware that stacking increases the risk of vignetting, especially on wider lenses, and can further affect exposure.

Generally, ND filters are not ideal for astrophotography as they reduce the amount of light reaching the sensor, which is already scarce in low-light astronomical settings. Filters designed to enhance nebula or light pollution reduction are more suited for astrophotography.

By reducing the amount of light, the filter allows you to use a slower shutter speed than would normally be possible in bright conditions. This slower speed captures the movement of subjects over time, resulting in a blurred effect.

The nano-coating helps to reduce reflections, minimize lens flare and ghosting (when shooting towards light sources), ensures a neutral color balance, and makes the filter easier to clean and more resistant to scratches.

In very low light conditions after attaching the filter, your camera's autofocus might struggle slightly as less light is reaching the sensor. However, in most typical bright-light scenarios, autofocus performance should remain largely unaffected.

Check the number followed by a circle symbol (e.g., Ø 67mm) printed on the front or inside the lens cap of your camera lens. This indicates the filter thread diameter in millimeters.

Manually adjust your camera's shutter speed or aperture. Remember the filter reduces light by 6 stops, so you need to expose for this significant reduction. Use your camera's light meter or histogram as a guide.

While the nano-coating minimizes color cast, some may occur. Adjust the white balance in-camera before shooting or correct it during post-processing using editing software.

Ensure you have the correct filter size for your lens. Check the lens and filter threads for any debris or damage. Screw the filter on gently and straight, without forcing it.

This can occur with ultra-wide lenses. Try using a larger filter size and a step-up ring if necessary, or consider a slimmer filter design if available for your lens focal length. Shooting at slightly longer focal lengths may also resolve vignetting.