0.5mm Ultra-Thin Low-Halo Astrophotography Clip Filter Series for PENTAX Cameras

Lugging around equipment is not fun. Clip filters give creators the ability to address dynamic lighting conditions in a lightweight and compact manner. We have a wide range of internal clip filters specially designed for PENTAX cameras.

STC's patented clip filters are designed to eliminate common problems found with other clip filter manufacturers, specifically color shift around the edges of the frame when using wide-angle lenses. See the difference!

Compatible with: Supported Camera & Lens List

Features

• Ultra-thin 0.5mm glass reduces the halo effect around celestial objects.
• Unlike our competitors, our clip filter frames are made from non-magnetic anodized 304(A2) stainless steel treated with Teflon to avoid equipment scratches.
• Double-sided anti-smudge nano-coating is hydrophobic stopping moisture and mold.
• Antistatic coating keeps dust and fibers away from the filter.
• Covered by the world's first warranty and repair service for filters.

Installation Instructions

Due to varying QC standards across camera brands, even models of the same brand may have manufacturing tolerances. If the internal filter frame doesn't fit properly, please contact STC support or headquarters. Do not force installation.

Disclaimer

STC's Clip-in filters are innovative and rely on the camera's internal structure for stability. Minor marks from installation may occur but do not affect camera functionality or warranty. STC will not cover these marks or offer compensation. Please consider this before purchasing if reselling your camera is a concern.

Frequently Asked Questions

Which PENTAX cameras is this astrophotography clip filter compatible with?
This Astrophotography Clip Filter is designed for PENTAX cameras. Please check the Supported Camera & Lens List for the full compatibility list before purchasing.

What is the minimum lens focal length required?
Astrophotography clip filters are only suitable for lenses 14mm and greater. Using them with shorter focal lengths may result in vignetting or other optical issues.

What is the difference between Astro Multispectra (MS), Duo-Narrowband (Duo-NB), and Nightscape (NS)?
The Astro Multispectra (MS) enhances a broad range of nebula wavelengths for rich color astrophotography. The Duo-Narrowband (Duo-NB) targets H-alpha and OIII wavelengths for high-contrast nebula imaging under light-polluted skies. The Nightscape (NS) reduces artificial light pollution while preserving natural sky colors, ideal for landscape astrophotography.

Why is the glass only 0.5mm thick?
The ultra-thin 0.5mm glass is specifically designed to reduce the halo effect around bright stars and celestial objects — a common issue with thicker clip filters. This makes it especially suitable for astrophotography where star rendering quality is critical.

Will this filter cause color shift at the edges of the frame with wide-angle lenses?
STC's patented clip filter design is engineered to eliminate the edge color shift commonly found in other clip filter brands when using wide-angle lenses. However, some blurring around the edges may still occur with fisheye or super wide-angle lenses due to individual lens design differences — this is normal.

Will mounting this filter affect my camera's autofocus?
After mounting the clip filter, your camera's autofocus will automatically adjust to the change in optical axis. No manual calibration is required for most supported camera models.

Is this filter covered by a warranty?
Yes. STC offers the world's first warranty and repair service for clip-in filters. Please contact STC support for details.