Officina Stellare RH200 AT reflection rings and how to fix them.

Quick update for anyone fighting RH200 arcs/reflections.

After removing the internal baffle, star shapes improved a lot 👍
But I was still getting soft, extended arcs around bright stars.

📷 Screenshot 2026-03-19 131333.png

First thought: internal reflections.
So I added extra baffling inside the tube + dew extension… but the arcs were still there.

After taking another careful look, I realised the real issue:

👉 The stock dew extension is too short
👉 Light from the outer edge of the full-aperture corrector can reach the sensor directly

So it’s not really a reflection problem — it’s direct stray light.

The fix was simple: I 3D printed a longer dew extension and made sure the outer edge of the corrector is no longer visible from the camera position.

That completely solved it.

📷 Screenshot 2026-03-19 131439.png📷 Screenshot 2026-03-19 131524.png

Now I’m getting a clean, flat field with refractor-like stars and no more arcs 🙌

Hope this helps someone—this one took me longer than it should have 😅

📷 PXL_20260317_231855648.jpg📷 PXL_20260317_231923385.jpg📷 PXL_20260317_231956495.jpg