Description
Seestar S50 Bahtinov Focus Mask
Get sharp focus faster and more consistently with a Bahtinov focus mask designed specifically for the ZWO SeeStar S50. This simple focusing tool creates a clear diffraction pattern on a bright star so you can quickly confirm “perfect focus” before you start capturing.
Why use a Bahtinov mask on the Seestar S50?
- Faster focusing: spend less time tweaking focus and more time imaging.
- Repeatable results: the diffraction pattern makes it easy to confirm best focus.
- Sharper stars: critical focus helps you capture cleaner, more detailed images.
- Made for SeeStar S50: designed to fit and work with the Seestar form factor.
How it works (quick technical overview)
A Bahtinov mask creates a diffraction spike pattern on a bright star. As you adjust focus, the central spike moves. When the pattern is symmetrical and the central spike is centered, you’re at best focus.
How to use (step-by-step)
- Install the mask on the front of the SeeStar S50.
- Point at a bright star (or a target with a bright star in the field).
- Adjust focus until the diffraction pattern is symmetrical and the center spike is centered.
- Remove the mask and begin your imaging session.
Pro tips for best results
- Recheck focus if temperature drops significantly during the session.
- Use a bright star so the spike pattern is easy to see.
- Take a short test exposure to confirm the pattern looks clean and centered.
Material & finish
Crafted from durable black filament and 3D printed for strength and reliability. As with all 3D printed parts, minor surface details such as layer lines may be visible, but they do not affect performance.
Compatibility
- Designed for: ZWO SeeStar S50
Recommended pairings
- Shop all ZWO SeeStar accessories
- SeeStar S50 Spike Generators Kit (creative diffraction spikes)
- SeeStar S50 Dew Shield (helps reduce dew and stray light)
- SeeStar S50 Dust Cover (protects the front lens during storage)
FAQ
Do I leave the mask on while imaging?
No—use the mask to dial in focus, then remove it before capturing your actual images.
What star should I use?
Any bright star works well. Brighter stars make the diffraction pattern easier to see and center accurately.
Why does focus change later in the night?
Temperature changes can shift focus slightly. If your stars start to soften, recheck focus with the mask and continue imaging.