1. Introduction
The K&F CONCEPT Nano-X Pro Square Filter Protect Frame is designed to safeguard your 100x150mm square filters. This frame helps prevent damage and reduces fingerprints during handling and use, ensuring the longevity and optical performance of your filters. It is specifically compatible with the K&F CONCEPT X-PRO Square system.
2. Product Overview
The protect frame consists of several components that securely encase your square filter. Understanding these parts is essential for proper assembly and use.

Components:
- Side Frames (x2): These pieces secure the long edges of the filter.
- Upper Frame (x1): This piece secures the top edge of the filter.
- Bottom Frame (x1): This piece secures the bottom edge of the filter.
3. Setup and Installation
Follow these steps to properly install your 100x150mm square filter into the protect frame.
- Identify the upper, bottom, and two side frame pieces.
- Carefully align your 100x150mm square filter with the grooves of the side frames.
- Slide the filter into the side frames.
- Attach the upper and bottom frame pieces to complete the assembly around the filter. Ensure all pieces snap securely into place.

Important Note: Disassembly of the frame after installation is not supported. Once assembled, the filter is permanently secured within the frame to ensure maximum protection.
4. Operating Instructions
Once your square filter is installed in the protect frame, it is ready for use with the K&F CONCEPT X-PRO Square system.
- Insert the framed filter into the designated slot of your K&F CONCEPT X-PRO Square filter holder.
- Ensure the framed filter is securely seated in the holder before beginning your photography session.
- The frame provides a secure grip for easier handling and adjustment of the filter within the holder.
5. Maintenance
Proper care will extend the life of your filter protect frame and the filter it holds.
- Clean the frame with a soft, dry cloth. Avoid abrasive materials or harsh chemicals.
- While the frame helps prevent fingerprints on the filter, always handle the filter by its edges or the frame itself to maintain optical clarity.
- Store the framed filter in a protective pouch or case when not in use to prevent scratches and dust accumulation.

6. Troubleshooting
If you encounter issues with your K&F CONCEPT Nano-X Pro Square Filter Protect Frame, consider the following:
- Filter not fitting: Ensure your filter is a 100x150mm square filter with a thickness of 2mm. The frame is designed for this specific size.
- Frame not closing securely: Verify that the filter is correctly seated in the grooves of the side frames before attempting to attach the upper and bottom pieces. Apply gentle, even pressure.
- Difficulty inserting into filter holder: Confirm that your filter holder is part of the K&F CONCEPT X-PRO Square system, as this frame is designed for exclusive compatibility with that system.
7. Specifications
| Feature | Detail |
|---|---|
| Brand | K&F CONCEPT |
| Model Number | au-KF31.039 |
| Material | Plastic, Metal |
| Compatible Filter Size | 100 x 150 x 2mm Square Filter |
| Product Dimensions | 5.91"L x 3.94"W (150mm x 100mm) |
| Number of Pieces | 2 (frames for two filters) |
| Compatible Devices | K&F CONCEPT X-PRO Square system devices |
| Coating Description | Nano Coating (on compatible filters) |
| Water Resistance Level | Not Water Resistant (frame itself) |
8. Warranty and Support
K&F CONCEPT products are manufactured to high-quality standards. For warranty information, technical support, or service inquiries, please refer to the official K&F CONCEPT website or contact their customer service directly. Keep your purchase receipt for warranty claims.