The Vixen Focal Reducer for the ED81S, ED103S, & ED115S telescopes is a high-quality reducer for imaging use, designed to shorten the effective focal length of your refractor.  Shortening the scope's effective focal length quickens exposures and widens the field of view.

To use this focal reducer, you'll need both the Vixen #3878 Direct Wide Photo Adapter and a camera-specific T-mount for your SLR camera.  The outer portion of the T-mount is removed, and the remaining element of the T-mount affixes to the Direct Wide Photo Adapter.  You then attach both pieces on to your SLR like a lens, and on the other side of the Direct Wide Photo Adapter you screw in this focal reducer.  Together your SLR + T-Mount + Direct Wide Photo Adapter + focal reducer thread in to the rear of the focuser barrel upon the refractor.

Reduces Focal Length by 0.67x    Widens Viewing Field    Shortens Exposures    For Imaging Only    Requires #3878 Adapter and a T-Mount

With ED81S, effective focal length & aperture becomes 419mm f/5.2

With ED103S, effective focal length & aperture becomes 533mm f/5.2

With ED115S, effective focal length & aperture becomes 596mm f/5.2

Related Questions and Answers

Q: 1. Only compatible with R5?

A: The Canon RF 5.2mm f/2.8 L Dual Fisheye 3D VR Lens is compatible only with All Cine Cameras, Canon EOS R5 C, Canon EOS R6 Mark II and the Canon EOS R5.

Q: 2. Is this lens good for 360 photography tours?

A: Yes, the Canon RF 5.2mm f/2.8L Dual Fisheye 3D VR Lens is good for creating 360 virtual tours.

Q: 3. Is there a ND filter option?

A: Canon RF 5.2mm f/2.8 L Dual Fisheye 3D VR Lens has a gelatin filter holder on the back of the lens. This is an example of an ND filter you can use in that holder. https://www.bhphotovideo.com/c/product/503450-REG/Kodak_8383572_3_x_3_75mm.html?sts=pi&pim=Y

Q: 4. Plugin for DaVinci Resolve ?

A: As of today, January 11, 2022 the Canon EOS VR software is still in development. Canon has said they will be releasing the software in the next few months. They also say there will be a plug in for Adobe Premiere but do not say anything regarding plugin for DaVinci Resolve at this time.

Q: 5. Is it possible to record 4k 120P from the Sony FX3 in ProRes RAW on the Ninja Ultra?

A: The Sony FX3 does not produce a 120p RAW signal at all regardless of the recording option you choose.

Q: 6. What is the interaxial spacing of the lens?

A: If you mean the Interpupillary Distance or Baseline Length, that is shown as being 60mm.

Q: 7. Could this possibly work on a Red Komodo with an EOS-RF adapter?

A: The Komodo uses a RF Mount so you can use this lens without an adapter. The EF adapter wouldn't do much here.

Q: 8. Can this shoot 4K 120P from an A7SIII? The Ninja V+ could shoot that spec but only with select cameras in ProRes RAW.

A: The only way to record 4k 120p on the Sony A7SIII is to internal memory cards. The Ninja V Ultra at this moment supports ProRes RAW and other formats up to 4k 60p when working with the Sony A7SIII. . Atomos recording formats for the Sony A7SIII: https://www.atomos.com/compatible-cameras/a7s-iii

Q: 9. Is this compatible if my Atamos NinjaV is using the small rig cage? Or does it have to be cageless to work?

A: The SmallRig 2209 Cage for Atomos Ninja V/V+ should not effect the Kinotehnik LCDVF 5.2 Optical Viewfinder's (Shinobi, Ninja V/V+, BM5, LH5H) ability to mount to the Ninja V monitor.

Q: 10. does it work with Sony a7iv

A: Yes, the Atomos Ninja Ultra 5.2" Recording Monitor is compatible with the Sony A7IV.