NiSi Filter S5 Adapter For Sigma 20 F1.4 (Adapter Only)

NiSi Filter S5 Adapter For Sigma 20mm F1.4 – Adapter for S5 Holder with 360° CPL Rotation

The NiSi Filter S5 Adapter for Sigma 20mm F1.4 is a dedicated adapter that lets you use the Sigma 20mm F1.4 with NiSi’s S5 filter holder system. It provides 360° rotation for circular polarizers and is designed to avoid vignetting when used correctly with the S5 system.

Key features

• Specifically designed for the Sigma 20mm F1.4 lens.
• Adapter only — holder and filters are sold separately.
• No vignetting when used with the compatible S5 holder and filters.
• 360° rotating capability for use with circular polarizers (CPL).
• Constructed from aluminium alloy using CNC manufacturing.
• Allows use of an integrated Circular S5 Filter (sold separately).

What this adapter does

This adapter adapts the Sigma 20mm F1.4 to the NiSi S5 filter holder system. It fits into the S5 holder so you can mount square or rectangular filters and an integrated circular S5 filter when required. Because the adapter supports full 360° rotation, you can easily position and fine‑tune a circular polarizer without removing the holder.

Compatibility and system flexibility

If you already own the NiSi S5 system, you can add this adapter to make your existing S5 holder compatible with the Sigma 20mm F1.4. Conversely, the S5 system uses interchangeable adapters, so you can change adapters to make the same S5 holder compatible with other lenses as needed.

Construction and handling

The adapter is made from aluminium alloy and produced using CNC technology to ensure precise fit and durable construction. This build quality helps maintain alignment with the S5 holder and supports smooth rotation for polarizer adjustment.

What’s included

• Adapter only. The S5 holder, integrated circular filters, and other filters are not included and must be purchased separately.

Smart FAQ

Question: Do I receive the holder and filters with this adapter?
Answer: No. This listing is for the adapter only. The NiSi S5 holder and any filters, including the integrated circular S5 filter, are sold separately and must be purchased in addition to the adapter.

Question: Will this adapter cause vignetting on my Sigma 20mm F1.4?
Answer: When used with the compatible NiSi S5 holder and correctly matched filters, the adapter is designed to avoid vignetting. Ensure you mount the correct S5 holder and filter combination recommended for wide-angle use.

Question: Can I use a circular polarizer with this adapter?
Answer: Yes. The adapter supports 360° rotation, which lets you adjust a circular polarizer while it remains mounted in the S5 system. The circular S5 filter itself is sold separately.

Question: Can I use this adapter with other lenses?
Answer: The adapter is specifically made for the Sigma 20mm F1.4. However, the S5 system uses interchangeable adapters, so you can swap to a different adapter to make the S5 holder compatible with other lenses.