Urth ND64-1000 Variable ND Lens Filter - 43mm

'ND64' refers to approximately 6 f-stops of neutral density, and 'ND1000' refers to approximately 10 f-stops. This indicates the variable range of light reduction the filter provides.

Check the number printed on the front of your lens, usually near the lens cap area. It will typically have a symbol of a circle with a line through it, followed by a number and 'mm'. This filter is for lenses with a 43mm thread size.

Yes, this filter is very useful for video. It allows you to maintain a cinematic shutter speed (typically double your frame rate) even in bright conditions, which is crucial for achieving natural motion blur in video.

While the filter reduces light, most modern camera autofocus systems can still function adequately. However, in very low light conditions created by the filter, autofocus may become slower or less accurate.

The 'Plus+' designation typically indicates an enhanced coating, such as the 20-layer nano-coating mentioned, which offers improved light transmission, durability, and reduced color casts compared to standard or older versions.

Start by gently blowing off dust with a blower or soft brush. For fingerprints or smudges, use a dedicated lens cleaning solution on a microfiber cloth, wiping gently from the center outwards. Avoid abrasive materials.

While possible, stacking filters, especially variable NDs, increases the risk of vignetting and optical degradation (like X-patterns or color casts). It is generally recommended to use only the necessary filter.

This can occur at the extreme ends of the variable ND range. Try adjusting the filter to a slightly lower density setting or slightly rotating the filter relative to the lens if it's a rotating mount type. Ensure you are not exceeding the optimal range of the filter.

Variable ND filters can sometimes introduce color casts. Adjust the filter's density setting or use your camera's white balance settings or post-processing software to correct the color cast. The Plus+ coating is designed to minimize this, but it can still occur at extreme settings.

Ensure you have the correct filter size (43mm) and that the lens threads are clean and undamaged. Try aligning the filter carefully and screwing it on gently without forcing it.

Reconfirm the selected f-stop and shutter speed on your camera. Use your camera's built-in light meter or histogram to fine-tune the exposure. Ensure the filter is set to the desired stop range and not accidentally moved.