Urth Variable ND Filter - 40.5mm ND2-400

Name: Urth Variable ND Filter - 40.5mm ND2-400
Brand: Urth
SKU: lofn2eihvc
Availability: InStock

Urth Variable ND2-400 Filters provide 1 to 8.66 f-stops of light reduction, giving you greater cre...

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Product Information

Full details

The Urth Variable ND Filter (40.5mm ND2-400) is designed for photographers and videographers seeking greater control over exposure in bright or changeable light conditions. Its primary benefit is enabling creative effects like shallow depth of field in bright sun or motion blur for long exposures without overexposure. A potential caveat is the possibility of color cast or unevenness at extreme ND settings, requiring careful adjustment.

All features

Brand	Urth

Extended Product Information

FAQs

What does ND2-400 mean?

ND2-400 refers to the range of light reduction. ND2 blocks 1 f-stop of light, and ND400 blocks approximately 8.66 f-stops of light. The 'Variable' aspect means you can adjust the density anywhere within this range.

How do I determine the correct filter size for my lens?

Look for a diameter symbol (Ø) followed by a number (e.g., Ø40.5mm) printed on the front of your lens, usually near the lens cap. This is the filter thread size.

Can I stack this filter with other filters?

While technically possible, stacking variable ND filters is not recommended as it significantly increases the risk of vignetting, uneven light transmission, and 'X' patterns. It's best used as a single filter.

How do I clean the filter effectively?

Use a clean microfiber lens cloth. For tougher smudges, apply a small amount of lens cleaning solution to the cloth, not directly to the filter, and wipe gently.

Will this filter affect autofocus?

In most cases, the filter will not directly affect autofocus. However, in very low light or when set to maximum ND, the camera's autofocus system might struggle due to the reduced light reaching the sensor.

What is the difference between a variable ND and a fixed ND filter?

A fixed ND filter provides a specific, constant amount of light reduction (e.g., ND8 for 3 stops). A variable ND filter allows you to adjust the density across a range, offering more flexibility but potentially with trade-offs in image quality at extremes.

Troubleshooting

Uneven or 'X' pattern visible in the frame

This often occurs at the extreme ends of the variable ND range. Rotate the filter ring to a less dense setting where the pattern disappears. Avoid using the filter at its maximum or minimum settings if artifacts are present.

Color cast (e.g., blue, green, or magenta tint)

Variable ND filters can sometimes introduce a color cast. Try adjusting the filter to a slightly different density. If the cast persists, you may need to correct it in post-processing or consider a fixed ND filter.

Filter is difficult to screw onto the lens

Ensure the filter threads and lens threads are clean and free of debris. Do not force the filter; try gently rocking it while screwing. If it continues to be difficult, the thread sizes may not be perfectly aligned, or there might be an issue with the filter or lens threading.

Image appears too dark or too bright

Adjust the outer ring of the variable ND filter to change the amount of light being blocked. Ensure the filter is set to the desired f-stop or shutter speed combination for your scene.

Pros and Cons

Pros

Offers a wide range of light reduction (1-8.6 stops) in a single filter.
Provides significant creative freedom for aperture and shutter speed choices.
Helps achieve professional-looking long exposures and shallow depth of field effects.
Compact and easy to use for on-the-go adjustments.
Useful for both photography and videography in challenging light.

Cons

May introduce a color cast, especially at higher ND settings.
Potential for uneven light reduction or 'X' pattern at extreme ends of the range.
Requires careful rotation to achieve desired effect and avoid artifacts.
Quality can vary compared to higher-end, multi-element ND filters.

Setup, Compatibility & Care

Setup:

Ensure your lens is clean.
Screw the Urth Variable ND Filter onto the front of your lens, turning it clockwise until snug. For the 40.5mm size, confirm compatibility with your lens thread size.
Rotate the outer ring of the filter to adjust the ND density. Markings indicate the approximate f-stop range.

Compatibility:

This is a 40.5mm filter. It will fit lenses with a 40.5mm front filter thread. Always check your lens specifications for the correct filter size.

Care:

Store the filter in its protective case when not in use.
Clean the glass gently with a soft microfiber lens cloth. For stubborn smudges, use a lens cleaning solution sparingly on the cloth, not directly on the glass.
Avoid touching the glass surface with your fingers.
Periodically check the filter threads for debris.