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Bahtinov Focus Mask ZWO Seestar S50
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  • Bahtinov Focus Mask ZWO Seestar S50
  • Bahtinov Focus Mask ZWO Seestar S50

Bahtinov Focus Mask ZWO Seestar S50

€7.90
Tax included

Dial in razor-sharp manual focus on your ZWO Seestar S50 using a precision pattern calculated specifically for its f/5 optics.

  • 🎯 Dedicated f/5 Calculation: Slit geometry generated according to the official Bahtinov factor for the 50mm doublet (250mm focal length).
  • 🔄 100% Free Auto-Park: Slim profile lets the telescope arm swing and dock with zero mechanical friction on drive motors.
  • 💼 Case Compatible: Stores directly in the original ZWO foam case without removing the mask.
  • 💎 100% Technical PETG: Thermal stability against summer heat and winter freezing.
Quantity
Disponible / En cours d'impression

Bahtinov Focus Mask — ZWO Seestar S50

Dedicated f/5 optical factor, technical PETG 3D printing & 100% safe automatic park

While the native autofocus of the ZWO Seestar S50 is convenient, it frequently shows limitations when thin clouds roll in, temperatures drop, or faint targets are acquired: the sensor hunts back and forth, resulting in bloated stars. To regain pinpoint stellar sharpness, the Bahtinov mask remains the worldwide gold standard for dialing in pixel-level focus in under a minute.

🔬 Rigorous Optical Mathematics Based on the True Bahtinov Factor

📐 Custom Calculated for f/5 (250 mm)

Unlike generic stretched 3D files that produce muddy diffraction patterns, I computed the slit spacing and angles specifically for the f/5 ratio and 250 mm focal length of the Seestar S50 doublet. The resulting spikes on screen are crisp, high-contrast, and easy to center.

🔄 100% Safe Auto-Park Clearance

The profile thickness is kept to an absolute minimum: during an automatic shutdown, the telescope arm swings into resting position without touching the body, completely protecting your motors and belts.

Precise Snap-Fit Retention & Direct Case Storage

  • Calibrated Snap-Fit: Snug hold with zero mechanical play, even when tracking straight up at the zenith, yet easily removed with gentle pressure.
  • Direct Case Storage: The ultra-low profile allows the telescope to slide directly into the official ZWO foam carrying case without removing the mask.
  • Usable on Medium Magnitudes: No need to slew to the brightest star in the sky; clean slit geometry produces distinct spikes even on modest guide stars.
💎 3D Printed in 100% Technical PETG:

I reject cheap PLA that softens at 50 °C in hot cars and turns brittle in winter frosts. I print this mask using technical high-density PETG to deliver burr-free, clean slits and enduring dimensional stability across all seasons.

📋 Quick Field Protocol on Seestar S50:

  1. Snap the mask onto the front lens of your Seestar S50.
  2. Point toward a bright or moderate star (e.g., Vega, Altair, Sirius).
  3. In the Seestar app, switch to manual focus mode.
  4. Adjust the slider until the central diffraction spike bisects the exact center of the "X".
  5. Remove the mask: your optical plane is locked with surgical accuracy!

💡 The craftsman's word: "Focus is the single most critical factor between a blurry shot and a pin-sharp astrophotograph. By mathematically computing the slit pattern for the Seestar S50 f/5 optics and printing it in PETG in my Cannes workshop, I deliver a professional optical tool at a fair price of €7.90. Built by an astronomer, for astronomers."

— Vincent, Founder of Azur3dprint

Technical Specifications

  • Compatibility: Calibrated exclusively for ZWO Seestar S50 (first generation).
  • Function: Optical diffraction mask for manual focus calibration.
  • Pattern Mathematics: Official Bahtinov factor for 50 mm aperture / 250 mm focal length (f/5).
  • Material: Technical high-density black PETG (UV & freeze resistant).
  • Mechanical Clearance: 100% free arm rotation and auto-park cycle.
  • Storage: Compatible with original factory foam case without removal.
  • Mounting: Direct snap-fit without screws or glue.
  • Manufacturing: Modeled, field-tested, and 3D printed in my Cannes workshop (France).

❓ Frequently Asked Questions (FAQ) — Seestar S50 Bahtinov Mask

🔹 Can true optical quality be expected at only €7.90?

Yes, absolutely. Accessible pricing at Azur3dprint never compromises standards. Where the market frequently offers generic PLA masks at inflated prices, I enforce optical accuracy: the pattern is computed specifically for the f/5 optics of the Seestar and printed in rugged technical PETG. Real craftsmanship at a fair price.

🔹 What happens if I forget to remove the mask and the telescope parks?

Zero mechanical risk. I designed the profile to preserve native clearances: the arm rotates and closes without making contact with the chassis, keeping drive motors safe.

🔹 Why choose manual Bahtinov focus over the Seestar autofocus?

Autofocus uses software contrast calculations that can be deceived by atmospheric turbulence, haze, or night thermal shifts. The Bahtinov mask uses direct physical light diffraction—a foolproof, repeatable optical indicator.

🔹 Does the mask stay firmly attached when tracking near the zenith?

Yes. The snap-fit rim is calibrated to fractions of a millimeter to provide a solid hold, even pointing straight vertical at the zenith, while pulling off easily when desired.

A3D-S50-MSK-BAH
50 Items

Data sheet

Type de filament
Petg
New