# Neutral Density Variable Filter K&F 37mm — Adjustable ND2–ND400, Grey

**URL:** https://aio.lv/en/product--kf-sb7788--11878756
**Data updated:** 2026-03-09 20:44 (EET)
**Category:** Camera Filters
**Manufacturer:** K&F
**Manufacturer code:** SB7788
**EAN:** 5904647816732
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 31.99 €
**Prices and availability valid until:** 2026-07-26 23:59
**Price without VAT (21%):** 26.44 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--kf-sb7788--11878756

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 13.07.2026 | free |
| Pickup points | 16.07.2026 | 1.89 EUR |
| Courier delivery to door | 16.07.2026 | 4.99 EUR |

## Summary description

Variable neutral density (ND) filter by K&F for 37mm lens threads, offering adjustable light reduction from ND2 to ND400. The grey ND filter lets photographers control exposure and enable longer shutter speeds or wider apertures in bright conditions. Suitable for landscape, long-exposure, and video work where variable attenuation is needed.

## Long description

The Neutral Density Variable Filter K&F 37mm — Adjustable ND2–ND400, Grey is a slim circular filter designed for lenses with a 37mm thread. It provides continuously variable light attenuation from approximately 1 to 9 stops (ND2 to ND400) so photographers and videographers can reduce exposure without changing aperture or shutter speed settings abruptly. The grey glass maintains neutral colour balance and helps achieve long exposures, motion blur effects, or shallower depth of field in bright conditions while preserving image quality.
Advantages
This variable ND filter allows smooth, stepless control over exposure with a single rotating element, removing the need to carry multiple fixed-strength filters. Its neutral-grey glass is formulated to minimise colour cast, and the slim profile reduces the risk of vignetting on wide-angle lenses with a 37mm thread. The threaded metal frame ensures secure mounting and consistent alignment during adjustments.
Suitable for
Landscape photography with long exposures to smooth water and cloud motion
Architecture and urban scenes requiring controlled light in bright conditions
Portraits and shallow depth-of-field work in daylight without stopping down excessively
Video recording where gradual exposure adjustments are needed
Creative motion blur and light trail photography
Key specifications
Filter type: Variable neutral density (ND adjustable)
Thread size: 37 mm
Density range: ND2 to ND400 (approx. 1 to 9 stops of light reduction)
Optical element: neutral-grey glass designed to limit colour shift
Frame: slim metal threaded ring to minimise vignetting
Suitable use: photography and video for exposure control and creative effects
How to use
Screw the filter onto a lens with a 37mm front thread until it is secure but not overtightened. With the filter mounted, rotate the outer ring to adjust the attenuation level until the desired exposure is achieved; use live view or a light meter to confirm exposure when precise control is needed. For long exposures, stabilise the camera on a tripod and use mirror lock-up or electronic shutter features when available to reduce vibration. When finished, reverse the rotation to the minimum density position and remove the filter carefully.
Usage recommendations
To avoid cross-polarisation and uneven darkening at extreme settings, adjust density gradually and avoid stacking another polarising filter directly on this variable ND. For critical colour work, check white balance after setting the filter and make small corrections in-camera or during raw processing. Store the filter in a protective pouch to prevent scratches on the glass and maintain the slim frame to reduce the chance of vignetting on wide-angle lenses.

## FAQ

### How much does the K&F Variable ND Filter 37mm ND2–ND400 cost, and is it available for purchase?

The price is 31.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 10 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 13.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All K&F products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized K&F service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/11878756/67296306_large.webp