The F6457 Lens Ring Clamp for Olympus 8mm f/1.8 Fisheye Lens from Nodal Ninja includes a plastic insert ring that mounts to the outside diameter of the lens barrel before attaching the metal lens ring. The lens ring clamp is compatible with R1, R10, R20, RS1, RS2, and M-series heads as well as other Arca-type-compatible clamps. Not only does the ring give a quick release functionality to the lens, but the by loosening the collar lock you can rotate the lens at 60 and 90° positions while mounted to any of these heads.

The lens ring clamp can be permanently left of the lens for convenience and reduces stress of the lens barrel when in use. Index markings are located on the bottom of the foot to repeat a nodal point setting on a tilt head, and the ring does not block any markings on the lens so it allows the focal distance to remain visible on the barrel. In addition, 90° index marks on the front and 30° index marks on the back of the ring help to align the roll of the camera and lens.

For R1/R10/R20, RS1/2 and M-Series Heads    Rotate Lens Vertically or Horizontally    Arca-Type Compatible    Ring Reduces Stress on Lens Barrel    Allows Reading of Focal Distance on Lens    Scale for Nodal Point Repetition    90° Marks on the Front of the Ring    30° Marks on the Back of the Ring    Includes Plastic Insert for Outer Ring

Olympus 8mm f/1.8 Fisheye lens in MFT mount

Related Questions and Answers

Q: 1. What is the inside diameter of this ring clamp? Will it fit around the base of a Sigma 14-24mm F2.8 DG DN??

A: The inner diameter would be about 3.8". However, there are lens ring clamps specifically for the Sigma 14-24mm f/2.8 lens.

Q: 2. is this lens circular or rectilinear?

A: This is a rectilinear type which utilizes the entire sensor-plane area giving a 180 degree field of view.

Q: 3. What is the inside diameter of this collar???

A: The internal diameter of that lens ring is 3.96".

Q: 4. Work with the M1 MKIII ?

A: Being that this lens has an older Olympus 4/3 lens mount, the Vello Auto Lens Adapter - Four Thirds Lens to Micro Four Thirds Camera, BH # VELAEMFTFT would be needed to attach the lens to an OM-D E-M1 Mark II body. https://bhpho.to/3d5gXbL

Q: 5. Which lense would be best for portraits shooting with my Olympus E5 -- the Olympus M.Zuiko Digital ED 40-150mm f/4.0-5.6 R Lens (Black) or Olympus 40-150mm f/4-5.6 Zuiko ED Zoom Lens for Olympus Digital Cameras (Four Thirds System)? Thank you!

A: Thank you!

Q: 6. Is this lens compatvel with the Olympus Evolt 500 cmera?

A: Yes.

Q: 7. Can you use the teleconverter?

A: This lens is not compatible with the teleconverters unfortunately.

Q: 8. What is the internal diameter of the plastic ring?

A: The Nodal Ninja F6220-1 Lens Ring Clamp for Sony 18-55mm f/3.5-5.6 Lens is specifically designed for use with the Sony E 18-55mm f/3.5-5.6 OSS Lens. Unfortunately, the manufacturer does not list the internal dimensions of this ring clamp.

Q: 9. What is the inside diameter of this ring clamp? Will it fit around the base of a Sigma 14-24mm F2.8 DG DN??

A: The ring clamp is approximately 74mm. No, the 14-24mm is 85mm.

Q: 10. Will this work with Panasonic GX7?

A: The Olympus 70-300mm f/4-5.6 Zuiko ED Zoom Lens for Olympus Digital Cameras (Four Thirds System) is designed for use on the larger standard Four Thirds lens mount, not the smaller Micro Four Thirds lens mount used on the Panasonic Lumix DMC-GX7 Mirrorless Digital Camera. To connect the lens to the GX7, you would need to purchase the Olympus MMF-3 Four Thirds Lens to Micro Four Thirds Lens Mount Adapter, B&H # OLMMF3, or the Vello Auto Lens Adapter - Four Thirds Lens to Micro Four Thirds Camera, B&H # VELAEMFTFT, for your needs.