X-Circle by LockCircle – New Nikon F-mount option for Canon EF mount cameras

by planetmitch3 Comments

X-Circle by LockCircle Details

The trend of filming using a HDSLR is unstoppable, and the classic EF-Mount bayonet is becoming very popular in filmmaking field like a serious alternative cinematography camera mount!

The EF-Mount has a successful second life in the cinematography field, something that no-one expected when was designed to be the best still-camera bayonet mount, the same destiny happened to the HDSLR cameras offering motion images from a still photo camera, but still lenses are different than motion-picture lenses, just this is the starting point of the X-Circle project.

Expensive cinematography lenses (cinema primes really cost a fortune) have one important feature that still lenses cannot offer: marking on angled surface of the barrel, making it easy to read focus and aperture settings from side or behind the camera.

X-Circle has a smart solution (pat.pend.), a simple idea but very important….a lens ergonomics re-thought!

Every Nikon F-Mount Manual Focus lenses (including the professional ZF.2 Series) can be modified to X-Circle cine-style EF-Mount with a rock-solid mount (it's not an adapter, but a complete new mount) in five minutes with a 90° rotation of the focus/aperture marking from the original top position to the side! This is what we call SIDE INDEX VIEW (pat.pend).

X-Circle Side Index View

Camera assistants (stressed by the bad reading of top markings on the barrel) will appreciate the focus and aperture marks on the side of the lens barrel exactly behind the follow-focus knob, that's improves the performance of the focus-puller work with a simple ergonomics re-thought: a special (pat.pending) 90° rotated bayonet mount that moves the lens barrel marking from the top (photo mode) to the side (cine mode).

X-Circle is a complete bayonet mount with precise professional grade mechanical tolerances and not just and adapter with annoying mechanical play (and shot ruining) when pulling focus for video or cinema productions.

X-Circle is based on a highly precision collimation ring and a stainless – steel bayonet, available in kits supplyed with all the necessary screws to be easily installed by yourself following simple “step by step” instructions, and in case you'll need to step back to F-Mount it will be really easy: the best of two worlds, open to the future camera race!

The X-Circle stainless-steel EF Bayonet features the exclusive patent pending CineLock, that offers a rock-solid cine-style bayonet locking, designed to keep the lens really tighted to the camera especially when stressed by follow-focus work or remote control motors on gears.

There had been a long engineering work around the original EF-Mount bayonet and at the end we came out with some important improvements and the X-Circle CineLock bayonet upgrade offers a real cine-style rock-solid locking of the lens on the camera X-Circle is lens ergonomics re-thought! Side View Index and CineLock features….for your next “Hollywood Style” shooting!

Can be ordered now, shipment starts from end of February 2012

Price List USD 159

X-Circle by LockCircle highlights

  • Still photography lenses meets professional cine-style features.
  • Nikon F-Mount Manual Focus (including ZF.2) to cine-style Canon EF-Mount.
  • Exclusive SIDE INDEX VIEW (pat.pend.) for easy to read focus/aperture settings.
  • Innovative CineLock EF Bayonet with improved locking features for cine-style focus work.
  • Easy to mount kits with “step by step” instructions.
  • Focus to infinity.
  • Matte black painted rims for no reflection or flares.
  • Vision expanded with million of F-Mount lenses out there.
  • X-Circle is designed by a cinematographer on the field to improve shooting quality!

Blogger's Disclaimer: LockCircle is a planet5D sponsor, but we'll print all sorts of HDSLR related news – just let us know!

(cover photo credit: snap from the photos sent by LockCircle)


  1. Pingback: planet5D: New Nikon F-mount Option for Canon EF Mount Cameras | Kelly On A Tangent

  2. Clever. Might try this on my ZF lenses. That said, you’ll want to make sure your FF doesn’t obscure the view.

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