# Neutral Density Variable Filter K&F 77mm ND2–ND400 adjustable, gray (SB7798)

**URL:** https://aio.lv/en/product--kf-sb7798--11879032
**Data updated:** 2026-03-09 20:44 (EET)
**Category:** Camera Filters
**Manufacturer:** K&F
**Manufacturer code:** SB7798
**EAN:** 5904647816831
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 45.99 €
**Prices and availability valid until:** 2026-07-31 23:59
**Price without VAT (21%):** 38.01 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--kf-sb7798--11879032

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 16.07.2026 | free |
| Pickup points | 21.07.2026 | 1.89 EUR |
| Courier delivery to door | 21.07.2026 | 4.99 EUR |

## Summary description

Variable neutral density (ND) filter by K&F, 77 mm thread, adjustable from ND2 to ND400. This gray ND filter reduces light entering the lens to allow longer exposures, wider apertures in bright conditions, and motion blur control. Suitable for landscape, long-exposure, and video use where variable attenuation from about 1 to 9 stops is required.

## Long description

The Neutral Density Variable Filter K&F 77mm ND2–ND400 (gray) is an adjustable optical filter designed to control the amount of light reaching the camera sensor. With a 77 mm screw thread and a continuous attenuation range from ND2 to ND400, it provides flexible light reduction equivalent to roughly 1 to 9 stops. The filter lets photographers and videographers use longer shutter speeds, wider apertures in bright conditions, and create controlled motion blur without changing exposure settings or using multiple fixed ND filters.
Advantages
This variable ND filter offers a wide and continuous density range in a single unit, eliminating the need to carry multiple fixed neutral density filters. The 77 mm thread is compatible with many standard lenses, and the gray filter glass maintains color neutrality while reducing light. Its adjustable design enables precise exposure control for both still photography and video work, facilitating longer exposures, depth-of-field control, and smoother motion rendering in bright environments.
Suitable for
Landscape photography requiring long exposures for smooth water and cloud motion
Architectural and urban scenes where selective motion blur is desired
Video recording in bright light when slower shutter speeds are needed for cinematic motion
Portraits shot outdoors with wide apertures to achieve shallow depth of field
Key specifications
Thread diameter: 77 mm
Density range: adjustable from ND2 to ND400 (approximately 1–9 stops)
Filter color: neutral gray
Mount type: screw-in circular filter
Typical applications: long exposure, aperture control in bright light, motion blur and video shutter control
How to use
Screw the filter onto the front thread of a compatible 77 mm lens and rotate the outer ring to adjust the attenuation between ND2 and ND400. Compose and focus the scene before making large density changes, as heavy attenuation will make framing and focusing through the viewfinder or live view more difficult. When using autofocus, confirm focus at lower density or manual focus if necessary. For long-exposure shots, use a tripod and a remote release or timer to avoid camera shake. In video, set shutter angle or shutter speed according to desired motion rendering while adjusting the filter to achieve correct exposure.
Usage recommendations
To minimize the risk of cross-polarization or color shifts at extreme densities, avoid stacking multiple filters and, when possible, test the filter at the intended density settings before critical shoots. Use lens hoods to reduce stray light and clean the filter with a microfiber cloth to maintain optical quality.

## FAQ

### How much does the K&F Variable ND Filter 77mm ND2–ND400 cost, and is it available for purchase?

The price is 45.99 € (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 16.07.2026 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/11879032/67296783_large.webp