PetaPixel

Lens Twist Trick: How to Lock a Lens at a Certain Aperture

Modern DSLR lenses don’t usually have aperture rings, and opening and closing the aperture is the camera’s responsibility. If for some reason you need to keep the aperture blades locked in a certain position, the “lens twist trick” can help you do so. Simply untwist the lens from the camera while holding the depth of field preview button.

One practical use for this trick is time-lapse photography. Cameras don’t always close the aperture to exactly the same size every shot, and the slight variation can cause a flicker in the resulting time-lapse video (a problem called “aperture flicker“).

(via planet5d)


 
 
  • Aaron Kupferman

    If you do a lot of time-lapse work, just use a lens with a manual aperture with an adapter to EOS.  I love my old Carl Zeiss Contax glass.  Just as sharp as my Canon glass, and smaller, lighter, and cheaper.  KEH has tons of great older Zeiss, Leica, Nikon, Olympus, and other glass that can be easily adapted to Canon EOS mount. 

  • Anonymous

    This won’t work on Nikon, because while Canon uses a solenoid in the lens itself to move the aperture blades, Nikon uses a mechanical linkage to a solenoid in the body.

  • will hall

    This is a fairly old trick also used in macro work to stop down without an electrical link due to using manual extension tubes or reversing the lens

  • http://twitter.com/Jeoncs Jeoncs

    Seems like an easy way to short stuff

  • http://twitter.com/Dustin_Farrell Dustin Farrell

    OR if you already own a lot of auto glass like most shooters, you can just twist your lens.  Works just as well :)

  • http://twitter.com/Dustin_Farrell Dustin Farrell

    Tried it on my old D70s. You are right, didn’t work :(

  • David

    And when the lens falls off you have Aperture Bounce all the way to an expensive repair job.

  • Scott

    Or use a lens with an aperture ring on a Nikon.

  • E-Nonymouse A

    Zeiss manual lense is pretty fab for stationary subjects.