# Neutral Density Variable Filter K&F 49mm ND2–ND400 adjustable gray (KF01.1398)

**URL:** https://aio.lv/en/product--kf-sb7792--11878564
**Data updated:** 2026-03-09 20:44 (EET)
**Category:** Camera Filters
**Manufacturer:** K&F
**Manufacturer code:** SB7792
**EAN:** 5904647816770
**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-sb7792--11878564

## 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

Adjustable neutral density (ND) filter by K&F in 49 mm diameter, model KF01.1398 (SB7792) covering ND2 to ND400 density range. Designed to reduce light entering the lens for longer exposures, wider apertures or motion blur control. Useful for landscape, long-exposure, and video work where precise light reduction and gradual adjustment are required.

## Long description

The Neutral Density Variable Filter K&F 49mm ND2–ND400 adjustable gray (KF01.1398) is a 49 mm variable ND filter that provides continuous light reduction from approximately 1 stop (ND2) up to 9 stops (ND400). It is designed to allow precise control of exposure, enabling longer shutter speeds, wider apertures in bright conditions, and improved motion blur control for both still photography and video. The slim 49 mm mount fits lenses with matching filter threads and permits gradual adjustment of density without changing filters.
Advantages
This K&F variable ND filter offers smooth transition between densities for accurate exposure control and simplified operation compared with switching multiple fixed ND filters. Its compact 49 mm size reduces vignetting risk on small- and medium-format lenses and keeps the front profile slim for easier handling. The adjustable mechanism enables incremental light reduction which is useful when fine-tuning shutter speed or depth of field while shooting in variable lighting. Constructed for general photographic use, it supports prolonged exposures and controlled motion effects without altering color balance when used correctly.
Suitable for
 Landscape photography requiring long exposures to smooth water or clouds
 Long-exposure urban photography to blur traffic and create motion trails
 Video recording where consistent light reduction and aperture control are needed
 Portraits shot in bright daylight when using wide apertures for shallow depth of field
Key specifications
 Thread diameter: 49 mm
 Density range: ND2 to ND400 (approx. 1 to 9 stops)
 Type: Variable neutral density (adjustable)
 Effect: Continuous light reduction for extended exposures and aperture control
 Optical construction: Multi-element coated glass designed to reduce reflections
 Mount profile: Slim design to minimize vignetting on compatible lenses
How to use
Attach the filter to a lens with a 49 mm front thread by screwing it on until secure; avoid overtightening. Rotate the front ring to adjust the density gradually until the desired exposure or motion effect is achieved. When using long exposures, stabilize the camera on a tripod and use a remote shutter release or timer to prevent camera shake. For video, monitor exposure and histogram while rotating the filter slowly to maintain consistent brightness. Be aware of potential cross-polarization or X-patterns at extreme settings and reduce density if such artifacts appear.
Usage recommendations
For best results, combine the variable ND filter with careful exposure metering and manual camera settings. If using the filter at or near maximum density, check images for uneven darkening (X-pattern) and stop down or reduce rotation if necessary. Use lens hoods or shading to minimize stray light and preserve contrast during long exposures.

## FAQ

### How much does the K&F 49mm Variable ND Filter ND2–ND400 KF01.1398 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/11878564/67296058_large.webp