Urth 95mm Variable ND Lens Filter (Plus+) - ND2-32

ND2-32 indicates the range of light reduction the filter provides. ND2 blocks 1 stop of light, and ND32 blocks 5 stops of light. The filter is adjustable between these two extremes.

No, this filter is specifically designed for lenses with a 95mm front filter thread. For other lens sizes, you would need a filter with the corresponding thread size.

The filter has markings on its rim indicating the minimum and maximum ND levels. Rotate the outer ring until the indicator points to your desired setting. It also has f-number markings for reference.

Variable ND filters are generally not ideal for astrophotography, as they can introduce unwanted artifacts and may not block enough light while still allowing enough to pass for long exposures of stars. Dedicated filters are recommended for such purposes.

The 'Plus+' designation typically signifies Urth's premium line, indicating enhanced features such as the 20-layer nano-coating on the SCHOTT glass for superior performance and durability.

Vignetting, or darkening at the edges of the image, can occur with any filter, especially variable NDs on ultra-wide-angle lenses at their widest settings. This 95mm filter is less prone to vignetting on appropriately sized lenses but it is still a possibility on very wide focal lengths.

This is a common artifact with variable ND filters, often called the 'X-effect'. It occurs when the two polarizing filters within the variable ND are rotated too far. Ensure you are within the marked min-max range on the filter rim and avoid pushing the rotation to its absolute limit.

While this filter is designed for color neutrality, extreme ND settings can sometimes introduce a slight color shift. Try adjusting the ND level slightly or using your camera's white balance settings to correct the cast in post-processing. High-quality filters like this minimize this issue.

Ensure you are aligning the filter threads correctly with your lens. If it feels stuck, do not force it. Try gently twisting it back and forth. If the problem persists, check for any debris in the lens threads or filter threads.