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Baader FlipMirror II Star Diagonal


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  • Streamline your workflow with this multi-use diagonal
  • Adjustable ports for any accessory
  • Perfect for both imaging and visual

Product Details

  • Experience the 'Swiss Army Knife' of star diagonals that is the Baader FlipMirror II Star Diagonal. With 3 adjustable, configurable output ports and a high-quality flip mirror, the FlipMirror II becomes the heart of your equipment system. Its multitude of adaptations give the imager and visual astronomer practically limitless ways to couple and operate multiple instruments, cameras, guiders, OAGs, eyepieces, and more!

    Baader Flip-Mirror II Star Diagonal Diagram Full

    The Baader FlipMirror II Star Diagonal has a straight-through build (S52, M48, and T-2 on both sides) for full-frame cameras, spectrographs, or other instruments. The T-2 threads are also adjustable to ensure your ability to alter this however you will. The rotatable M48 connection rings can be fixed in the optimum position to rotate any accessory around the optical access and is constructed of hardened, stainless steel on front and rear to be backlash-free with the FlipMirror's housing.

    Telescope auxiliary instruments cover a wide range of interests, from a sole eyepiece, via camera use, to high-end spectroscopy. Unfortunately, every telescope just features one exit port. This causes relentless manual exchange of parts in the dark, causing huge time loss, wear on the parts - and "nerves". And whenever you start controlling your telescope remotely - the single port becomes a painful reality. This product is guaranteed to improve your workflow--especially during astrophotography, which is ultimately the main goal of the Baader FlipMirror II. 

    The BFM II lets you switch between a straight light path for a camera or other measuring instrument and an angled light path for something like an eyepiece. Additionally, a calibration lamp for spectrographs or OAG can be connected at the AUX port on the bottom of this device.

  • specifications

    Free ShippingYes
  • included items

    • Baader FlipMirror II Star Diagonal
    • Laterally adjustable T-2a Top Ring
    • 2x M48i / S52 Dovetail ring made of hardened stainless steel
    • Reducing ring M48a / T-2i
    • Reducing ring M48a / T-2a
    • Inverter ring M48a / M48a
    • Pin type face wrench for M48 / t-2 and M4 counter nuts
    • 3 mm screwdriver for M 4 brass adjustment screws
    • 4x hex keys
    • Bottom flange for OAGs or calibration lamp
    • Dust cap for bottom flange
    • 2xM48 dust caps
    • T-2 dust cap

Product Reviews

Customer Reviews
4.8 Based on 8 Reviews
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Peter P.
United States United States

Baader FlipMirror II Star Diagonal

Excellent quality. Works right out of the box!

William D.
United States United States

Baader flip mirror

Great product at a great price.Well made. I use it to switch between an eyepiece and my Nikon D200 DSLR Note that to make it work you will need more adapters than those provided.

United States United States

FlipMirror has Excellent design and build

the flexibilty being able to use different size attachments is very helpful… end couplings can accommodate M42, M48, and S52. the best part is the flexibility allowing any position angle on the in light path or the out path. it is easy to position a camera with a specific position angle relative to the scope and then position the flip mirror to a convenient position for viewing through the eyepiece port — no need to strain your neck. construction is very solid. may be a little more expensive than others, but very high quality.

OPT Telescopes Baader FlipMirror II Star Diagonal Review
United States United States

Be careful what you buy!

One of the most frustrating and maddening experiences I have ever had! I have still not been able to use the FlipMirror because I'm slowly figuring out the various connections required for my setup.. and this has required ordering parts that did not work for me, wasting time and money, etc. There has to be a better way of doing this! Perhaps each time it's ordered from you, ask the buyer how they intend to use it and suggest the connectors that will be required, so they can be ordered at the same time? Or add this kind of suggestion as part of the product literature on your website? OPT is fine, and I am hopeful that the FlipMirror will be as well. But I'm not sure I would have bought it if I had known initially that it would be so difficult to put it together so that it can work.

United States United States

A Must Have for Astrophotography.

This item with the Baader 1.25" T2 Adapter w/Microfocuser is a Must Have for Astrophotography.

Kevin W.
United States United States

Very functional

This is a well made product and I'd have given it 5 stars but the instructions on connecting the accessories are a little bewildering. I had help in getting attachments for it from an expert here and at the end, we just both hoped all the pieces would fit together. If you really understand the system and all the different attaching methods then the instructions will probably work, but for everyone else, not so much. All that said, I like the flip mirror and glad I purchased it.