# Neutral Density Variable Filter K&F 43mm adjustable ND2–ND400, gray (model SB7790)

**URL:** https://aio.lv/en/product--kf-sb7790--12110254
**Data updated:** 2026-03-20 10:01 (EET)
**Category:** Camera Filters
**Manufacturer:** K&F
**Manufacturer code:** SB7790
**EAN:** 5904647816756
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 36.49 €
**Prices and availability valid until:** 2026-08-23 23:59
**Price without VAT (21%):** 30.16 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--kf-sb7790--12110254

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 07.08.2026 | free |
| Pickup points | 12.08.2026 | 1.79 EUR |
| Courier delivery to door | 12.08.2026 | 4.99 EUR |

## Summary description

Variable neutral density (ND) filter by K&F, 43 mm thread size, adjustable from ND2 to ND400. Gray glass reduces light entering the lens to allow longer exposures and wider apertures in bright conditions. Useful for landscape, long-exposure, and motion-blur photography; compatible with lenses that accept 43 mm screw-in filters.

## Long description

The Neutral Density Variable Filter K&F 43mm adjustable ND2–ND400 is a screw-in gray filter designed to control the amount of light reaching the camera sensor. With a 43 mm thread size, this variable ND filter lets you continuously adjust light reduction from approximately 1 to 8.6 stops (ND2 to ND400), enabling longer shutter speeds and wider apertures in bright conditions without changing exposure settings or ISO. The optical glass and neutral-gray tint preserve color balance while reducing overall exposure, making the filter suitable for landscape, long-exposure, and motion blur photography with lenses that accept 43 mm filters.
Advantages
The adjustable ND2–ND400 range provides flexible control over exposure without the need to carry multiple fixed ND filters. Its screw-in 43 mm mount ensures secure attachment to compatible lenses and maintains a compact profile, avoiding added bulk compared with drop-in or filter-holder systems. The neutral gray glass is formulated to minimize color cast so that white balance adjustments remain minimal in post-processing. Continuous adjustment enables precise framing and exposure decisions on location, and the robust metal frame offers consistent alignment and rotation during use.
Suitable for
 Landscape photography requiring long exposures to smooth water and clouds
 Long-exposure cityscapes and light-trail photography
 Motion-blur effects for waterfalls, rivers, and moving subjects
 Portraits or shallow-depth-of-field work in bright daylight when a wider aperture is needed
Key specifications
 Filter type: variable neutral density (gray)
 Thread size: 43 mm screw-in
 Density range: adjustable from ND2 to ND400 (approx. 1 to 8.6 stops)
 Material: optical glass with metal mount
 Color cast: neutral gray for minimal colour shift
How to use
Screw the filter gently onto the front thread of a 43 mm lens until it sits flush but not over-tightened. Rotate the front ring to adjust the density from light reduction equivalent to ND2 up to ND400 while observing the exposure changes through the viewfinder or on the LCD. When composing long exposures, set your camera on a tripod and use live view or an exposure meter to determine the required shutter speed and aperture. Use remote release or self-timer to avoid camera shake during longer exposures. Check for any vignetting at wide focal lengths and adjust composition or remove the filter if necessary.
Usage recommendations
For best results, use the filter with a sturdy tripod and consider bracketing exposures for scenes with wide dynamic range. Clean the glass with a microfiber cloth before and after use to avoid dust and smudges. When shooting at the highest densities, monitor for cross-polarization or X-pattern artifacts and reduce density if these appear by slightly backing off the rotation.

## FAQ

### How much does the K&F 43mm Variable ND Filter ND2–ND400 (SB7790) cost, and is it available for purchase?

The price is 36.49 € (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 07.08.2026 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/12110254/67646147_large.webp