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The Urth 67mm ND2-400 Variable ND Filter is designed for photographers and filmmakers seeking greater creative control in varying light conditions. It offers 1 to 8.6 f-stops of light reduction, enabling wider apertures for shallow depth of field or slower shutter speeds for motion blur without overexposure. A potential caveat is the need for careful rotation to avoid X-pattern artifacts at extreme settings.
| Brand | Urth |
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'ND' stands for Neutral Density. '2-400' indicates the range of light reduction, from a factor of 2 (approximately 1 f-stop) to a factor of 400 (approximately 8.6 f-stops).
The filter has markings indicating the approximate range. For precise control, it's best to adjust the filter, take a test shot, and check your camera's exposure meter or histogram. Fine-tuning camera settings is often necessary.
This specific filter is 67mm. You would need a step-up or step-down adapter ring, or purchase the filter in the correct size for your lens. Using adapters can sometimes cause vignetting.
While it reduces light, it doesn't directly interfere with autofocus mechanisms. However, in very low light conditions after applying a strong ND effect, autofocus may struggle more than without the filter.
The 'X' pattern is inherent to variable ND filters at their maximum and minimum density. Try to rotate the outer ring slightly away from the extreme ends (ND2 or ND400) to find a point where the pattern disappears. This usually leaves enough range for most practical uses.
Generally, variable ND filters are not ideal for astrophotography. Their purpose is to reduce excess light, whereas astrophotography aims to capture faint light. Fixed ND filters are also rarely used for deep-sky astrophotography.
Urth typically offers a lifetime warranty on their filters against manufacturing defects. Please refer to Urth's official website for the most current warranty details.
This is common at the extreme ends of the variable ND range. Rotate the outer ring slightly to find a point where the pattern disappears. Avoid using the very minimum or maximum settings if this occurs.
While Urth filters aim for neutrality, some slight cast can occur at extreme settings. This can typically be corrected in post-processing software. Ensure the filter is clean and free of oils.
Check that you are using the correct filter size (67mm) and that the lens threads are clean and undamaged. Align the filter carefully and turn gently. Do not force it.
Ensure the filter is set to a higher ND stop (closer to 400) and that you have adjusted your camera's shutter speed or aperture accordingly. Variable NDs require manual adjustment of camera settings.
Setup:
Compatibility:
This filter is specifically designed for lenses with a 67mm filter thread. Urth offers this same filter in a variety of other sizes (e.g., 37mm, 52mm, 82mm) to accommodate different lens diameters. Check your lens's front filter thread size before purchasing.
Care:
