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Expert Pack Seestar S50 — Safe Retractable 2" Filter Mount System
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  • Expert Pack Seestar S50 — Safe Retractable 2" Filter Mount System
  • Expert Pack Seestar S50 — Safe Retractable 2" Filter Mount System
  • Expert Pack Seestar S50 — Safe Retractable 2" Filter Mount System
  • Expert Pack Seestar S50 — Safe Retractable 2" Filter Mount System
  • Expert Pack Seestar S50 — Safe Retractable 2" Filter Mount System
  • Expert Pack Seestar S50 — Safe Retractable 2" Filter Mount System

Expert Pack Seestar S50 — Safe Retractable 2" Filter Mount System

€59.90
Tax included

Safely mount standard 2" (M48) filters on your ZWO Seestar S50 with this anti-drop retractable system and magnetic dew shield.

  • 🔄 Passive Mechanical Swing: Sensor probe gently pivots the baseplate away during auto-park: zero gear strain and zero ground drop.
  • 🧲 Embedded Neodymium Magnets: Trapped inside the polymer core during 3D printing without glue; fully dew-proof.
  • 📐 Flared Dew Shield (>55mm): Calculated cone adds zero extra vignetting. 1mm shim included.
  • 📦 Complete Expert Kit: Swing plate, dew shield, Bahtinov mask, 2 spike masks (4/6 vanes), and storage box.
Quantity
Disponible / En cours d'impression

Expert Pack for ZWO Seestar S50

Safe retractable mount system, 2" (M48) filter holder, flared magnetic dew shield & dedicated masks

Installing standard 2" narrowband filters (Dual-Band, Optolong L-eNhance/L-Ultimate, Baader, etc.) onto the ZWO Seestar S50 dramatically boosts deep-sky performance under light-polluted skies. However, this setup traditionally came with severe mechanical hazards: during an automated mid-night shutdown (« Park »), rigid third-party mounts collide with the chassis, risking stripped stepper gears or shattering a €150+ glass filter. Other DIY mounts simply drop the filter straight onto hard ground. I designed and engineered this Expert Pack in my Cannes workshop to provide complete, risk-free nocturnal autonomy.

🔬 Field-Proven Kinematic and Magnetic Engineering

🔄 Captive Passive Swing Clearance

As the motorized arm closes for parking, an angled guide finger gently makes contact with the telescope body, smoothly pivoting the filter baseplate outward on its axis. The entire assembly swings aside while remaining firmly attached: nothing drops, drive motors experience zero drag, and arm overtravel is absorbed at any angle.

🧲 Embedded Neodymium Magnets

I reject cyanoacrylate glue, which becomes brittle and fails under freezing temperatures and dew. My neodymium magnets are inserted directly into the polymer core during 3D printing: fully sealed, they can never pull out and are completely immune to atmospheric corrosion.
📐 Workshop Optical Precision Regarding Aperture & Vignetting:

Optically, adapting an external mechanical filter cell with a standard 2" filter (which features an internal clear glass aperture of roughly 44 mm) marginally stops down the entrance pupil of the 50 mm doublet. This geometric reality applies to any threaded filter adaptation on compact setups, and is heavily outweighed by the massive contrast gains on emission nebulae. In contrast, the magnetic dew shield introduces zero additional vignetting: its interior conical geometry flares to over 55 mm at the rim, preserving the full optical path.

Universal 2" (M48) Filter Fit & Micrometric Shimming

Metal cell thickness differs across astronomical filter brands (6 mm on Baader cells, 5 mm on SVBONY, Optolong, or ZWO cells). To ensure a flush fit without mechanical play or lateral stray light leaks:

  • Calibrated 48.20 mm Socket: Snug mechanical grip for standard M48 threaded filter rings without binding.
  • 1 mm Shim Ring Included: Inserted or removed in seconds to match the mechanical height of your filter cell.

📦 Complete Hardware Included in Your Expert Pack:

  1. Snap-fit mounting base: Attaches directly to the front optical barrel of the Seestar S50 without scratching the housing.
  2. Articulated swing plate: Features the passive guide finger and embedded neodymium magnets.
  3. 1 mm thickness compensation shim: For leveling 5 mm or 6 mm M48 filter rings.
  4. Flared magnetic dew shield (>55 mm): Snaps into place via magnetic hold; calculated conical shape adds zero extra vignetting.
  5. Front Bahtinov focus mask: Snaps onto the front rim of the dew shield for manual focus confirmation.
  6. Magnetic diffraction spike duo (4 & 6 vanes): Docks magnetically between the baseplate and dew shield to stylize stellar fields.
  7. Dedicated storage box: Keeps your diffraction masks protected from bending and grit in your gear bag.

💡 The craftsman's word: "Running unattended all-night imaging with a €150+ glass filter requires total confidence in your mechanics. I developed this retractable kinematic system so you can sleep peacefully: at auto-park, the plate swings away smoothly while keeping your gear attached. Built by an astronomer for astronomers, and 3D printed in my Cannes workshop at an honest price of €59.90 for the complete setup."

— Vincent, Founder of Azur3dprint

Technical Specifications

  • Hardware Compatibility: Calibrated strictly for ZWO Seestar S50 (first model — not compatible with S50 Pro).
  • Supported Filter Format: Standard 2-inch astronomical filters (M48 × 0.75 mm thread).
  • Safety Kinematics: Passive mechanical swing-aside action on an axis without detachment at auto-park.
  • Magnet Engineering: High-power N52 Neodymium magnets embedded inside polymer during 3D printing.
  • Dew Shield Clear Aperture: Greater than 55 mm at top rim (anti-vignetting flared profile).
  • Materials: Technical high-density black PETG & Carbon-Fiber reinforced PETG (PETG-CF).
  • Manufacturing: Designed, 3D printed, and hand-assembled in my workshop in Cannes, France.

❓ Frequently Asked Questions (FAQ) — Seestar S50 Expert Pack

🔹 Does this setup cause light loss or vignetting on images?

Optically, adding an external mechanical holder with a standard 2" filter (clear glass aperture ~44 mm) slightly stops down the entrance pupil of the 50 mm doublet. This geometric rule applies to any threaded filter setup on the Seestar. However, the magnetic dew shield is calculated with a flared geometry opening past 55 mm at the front rim: it adds zero extra vignetting or light reduction.

🔹 What happens if my Seestar auto-parks with the filter and shield fitted?

The system was engineered specifically for this scenario. The contoured guide finger contacts the telescope body as the arm swings downward. Through smooth passive mechanical leverage, it pivots the entire plate outward. The arm returns to park position without motor friction, keeping your expensive optical filters suspended safely above the ground.

🔹 Why choose embedded magnets over glued ones?

Cyanoacrylate glue turns brittle and fails under nocturnal frost and heavy dew, causing glued magnets to pop loose after several weeks in the field. By embedding magnets directly inside the part during 3D printing, they remain shielded from atmospheric moisture and can physically never pull free.

🔹 Is this Expert Pack compatible with the Seestar S50 Pro?

No. The Seestar S50 Pro features a different housing incorporating a secondary wide-angle camera. This pack is engineered exclusively for the original Seestar S50. A dedicated version for the S50 Pro is available separately on the store.

A3D-S50-KIT-EXP
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Data sheet

Type de filament
Petg
New