Focus speed vs FPS

9 years 1 month ago #428817 by flombard
I was shooting a football match the other late afternoon.I was shooting with a 5Diii and the Tamron 150-600. I was shooting in manual mode at 1/500 F8 and auto iso. Camera was set to continuous shooting mode and Al Servo mode. I was finding that the focus tracking with the lens at 600mm was affecting the cameras fps rate. I got about 3fps max. I then loaned a Canon 600 mm f4 prime lens. The focus was super fast and I could get 6fps. Am I wrong in assuming that the faster focusing lenses or more relevant slower focus lenses can impact the fps rate of your camera.  Even if you set the Canon lens to f8 it still uses the max aperture of the lens f4 to get focus and then just before the shutter fire the lens is set to the chosen aperture. To my knowledge the camera need light to focus and the more light the faster it will focus. So lenses with wider apertures will focus faster and thus help your camera to achieve its max fps.


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