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Urth Variable ND Lens Filter (39mm, 1 to 8.6-Stop)

BH #URVND240039 • MFR #UNDX400ST39
126 reviews
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Urth Variable ND Lens Filter (39mm, 1 to 8.6-Stop)
Key Features
  • Variable 0.3 to 2.6 Optical Density
  • Offers Better Creative Control
  • Create More Cinematic Effects
This 39mm Variable ND Lens Filter can be adjusted to block 1 to 8.6-stops of light, giving you more flexibility in bright variable light. By blocking up to 8.6-stops, you can use wider apertures in bright variable light for shallower depth of field effects and slower shutter speeds for long exposure effects without overexposing your images.
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Urth UNDX400ST Overview

This 39mm Variable ND Lens Filter can be adjusted to block 1 to 8.6-stops of light, giving you more flexibility in bright variable light. By blocking up to 8.6-stops, you can use wider apertures in bright variable light for shallower depth of field effects and slower shutter speeds for long exposure effects without overexposing your images.
Cinematographers can use this Variable ND Lens Filter to create more cinematic effects in bright light. The filter comes with a protective travel tin case, a recycled cleaning cloth, and recycled plastic-free packaging.

EAN: 9354842005596

Urth UNDX400ST Specs

Filter Type
Variable ND
Exposure Reduction
1 to 8.6-Stop
Size
39 mm Rear Filter Thread
Front Accessory Thread / Bayonet
39 mm
Filter Material
Not Specified by Manufacturer
Ring Material
Aluminum
Packaging Info
Package Weight
0.175 lb
Box Dimensions (LxWxH)
4 x 3.9 x 1"

Urth UNDX400ST Reviews

Fits perfectly and great variable range

By Brittany
Rated 5 out of 5
Date: 2026-11-03

Love this ND filter, it fits perfect on the Fujifilm 23mm f/2.8 pancake lens and has great range different lighting.

a bit disappointing

By Michael
Rated 2 out of 5
Date: 2026-02-27

Had a chance to use the filter and there was some pretty heavy color cast at darkest setting. My skills can be in part to blame but was hoping for better. The example attached is a cell phone photo of a raw file I took with the filter at full darkness. I know some color cast can be fixed in post but thought the quality of this one would have bypassed the amount I got in this example in addition to some artifacts. General take away is that I'm happy to have a ND filter now but worried that there will be images that will be ruined beyond my editing skills to bring back from this amount of color cast.

See any errors on this page?

Is this antireflection-coated?

Is this antireflection-coated?
Asked by: Nicole
The manufacturer states that this filter has an 8 layer nano coating.
Answered by: Kirk R
Date published: 2022-06-07

I think I have seen some VND's have a total size ...

I think I have seen some VND's have a total size larger than its threading part, which ends up blocking the ability to mount a lens hood. Does the size of this filter prevent the mounting of a lens hood?
Asked by: Jonathan
Most Variable ND filters have a larger outer diameter than the thread in size. Urth ND2-400 (1-8.6 Stop) Variable ND Lens Filter (58mm) has a front and mount thread of 58mm. However, the outer diameter of this filter is 62mm therefore if your lens hood is not wide enough it may not fit with this filter mounted on your lens.
Answered by: Llinelva D
Date published: 2022-03-03

Many variable neutral density filters either ...

Many variable neutral density filters either cause a color shift at darker settings or the dreaded "X-effect" on wide angle lenses. Does this filter suffer from those issues?
Asked by: James
Any variable ND over 6-7 stops can create the X-effect. And that is the deign and physics of a variable ND filter. And it depends on the lens you are using and the light you are shooting under. As for the color shift almost all have some color shift including the Urth ND2-400 (1-8.6 Stop) Variable ND Lens Filter (77mm). These are higher models of filters, https://bhpho.to/3TSB4JH
Answered by: Rob K
Date published: 2023-10-26

Is this filter multi-coated?

Is this filter multi-coated?
Asked by: Ian
Yes, the manufacturer has stated that the Urth ND2-400 (1-8.6 Stop) Variable ND Lens Filter (77mm) has an 8-layer nano coating.
Answered by: Kirk R
Date published: 2022-01-24

Is the front threaded to allow use with a hood?

Is the front threaded to allow use with a hood?
Asked by: Kenneth
The Urth Variable ND Lens Filter (77mm, 1 to 8.6-Stop) (B&H# URVND240077) features both front and rear 77mm filter threads.
Answered by: Yoni S
Date published: 2026-06-18

hi B&H, Where is this filter made? and what type ...

hi B&H, Where is this filter made? and what type of optical glass used?
Asked by: Doan
According to our records, the Urth ND2-400 (1-8.6 Stop) Variable ND Lens Filter (43mm), BH #URVND24004 is made in China. Please note that this is subject to change at any time.
Answered by: Kirk R
Date published: 2022-01-18

Does it have hard stops?

Does it have hard stops?
Asked by: Kjetil
The Urth ND2-400 (1-8.6 Stop) Variable ND Lens Filter (82mm) features smooth twist adjustments rather than hard stops for each stop. This allows for seamless and precise control over the amount of light reduction. The filter can be easily adjusted to achieve the desired exposure without any abrupt changes or limitations.
Answered by: Marvin C
Date published: 2023-11-30

What size is the outside thread for a cap?

What size is the outside thread for a cap?
Asked by: Diane
It must be different to use a 46mm snap cap/pinch type cap? I tried to use a 46mm screw in cap and it was too small to screw into the front threads on the filter. ~ Diane M
Answered by: Diane
Date published: 2022-11-10
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