# Neutral Density Variable Filter K&F 37mm ND8–ND2000, Adjustable Grey (MPN SB6571)

**URL:** https://aio.lv/en/product--kf-sb6571--4825127
**Data updated:** 2026-03-07 15:00 (EET)
**Category:** Camera Filters
**Manufacturer:** K&F
**Manufacturer code:** SB6571
**EAN:** 6936069281712
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 42.49 €
**Prices and availability valid until:** 2026-07-28 23:59
**Price without VAT (21%):** 35.12 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--kf-sb6571--4825127

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 14.07.2026 | free |
| Pickup points | 17.07.2026 | 1.89 EUR |
| Courier delivery to door | 17.07.2026 | 4.99 EUR |

## Summary description

Variable neutral density (ND) filter by K&F for 37mm lens threads, offering adjustable light reduction from approximately ND8 to ND2000. The grey (neutral) filter allows control of exposure and shutter speed for long exposures, motion blur, and aperture management in bright conditions. Compact, screw-on design suited for photography and video use with compatible 37mm lenses.

## Long description

The K&F 37mm Variable Neutral Density Filter (adjustable ND8–ND2000) is a compact screw-on grey filter designed for lenses with a 37mm thread. It provides a continuously adjustable density range equivalent to approximately ND8 up to ND2000, enabling precise control of light entering the lens. The neutral grey coating preserves color balance while reducing exposure, making the filter suitable for slow shutter speeds, controlled depth of field, and motion blur effects in bright conditions. Its slim profile and straightforward screw-on mounting make it convenient for on-location photography and video capture with compatible 37mm lenses.
Advantages
The variable ND design replaces multiple fixed-density filters by allowing a smooth transition between lower and higher light reduction without changing glass. The neutral grey formulation maintains accurate color rendition across the adjustment range. The compact, low-profile construction helps reduce vignetting on wide-angle lenses with a 37mm thread and ensures stable attachment during handheld shooting. The screw-on mechanism provides fast installation and removal, suitable for quick changes in changing lighting conditions.
Suitable for
Long-exposure landscape photography to smooth water and cloud movement
Portraits and video requiring wider apertures in bright light
Creating motion blur for moving subjects such as traffic or waterfalls
On-location run-and-gun shooting with compact cameras and lenses
Key specifications
Filter type: variable neutral density (variable ND)
Thread diameter: 37 mm
Density range: approximately ND8 to ND2000 (continuous adjustment)
Optical effect: adjustable light reduction while maintaining neutral color balance
Mount type: screw-on filter ring
Profile: slim/low-profile design to minimize vignetting
How to use
Screw the filter onto the front thread of a compatible 37mm lens until snug; avoid over-tightening. Rotate the outer ring to change the density and observe the exposure or histogram on your camera to reach the desired shutter speed or aperture. For long exposures, use a tripod to prevent camera movement. When combining with other filters, attach the variable ND closest to the lens and check for cross-polarization or X-pattern at extreme settings; reduce the rotation degree if unwanted artifacts appear.
Usage recommendations
Monitor exposure, white balance, and focus when using strong attenuation. For very long exposures or critical color work, verify results with test frames and adjust composition or settings accordingly.

## FAQ

### How much does the K&F 37mm Variable ND Filter ND8–ND2000 cost, and is it available for purchase?

The price is 42.49 € (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 14.07.2026 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/4825127/30330866_large.webp