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Is it normal for the burst rate to slow down when you stop down the aperture?

Started Feb 9, 2020 | Questions thread
R2D2 Forum Pro • Posts: 26,529
Re: Is it normal for the burst rate to slow down when you stop down the aperture?

Praefos wrote:

R2D2 wrote:

This is all well and good, however it doesn’t explain why this slowdown only happens on adapted lenses, and not native EF-M lenses. Something else is at work here.

R2

I just tested it out. The aperture of EF-M lenses (18-150mm for example) doesn't open up while in high speed shooting mode. The aperture of the EF lenses (100mm 2.8 IS for example) closes down and opens up again and again. Therefore, there will always be a lag.

This behavior doesn't need to be EF or EF-M exclusive. It could either be a wrong command to the lens (bus system), a misimplementation in the camera or an old software version in the lens itself.

Depending on the lens, the aperture blades might also need more time to reach their correct position. With the EF 135mm 2.0 L for example the camera or the lens even tries to stop down when you use a smaller aperture.

Yeah, these mirrorless really do operate very differently under the hood.  Not so cut and dried as a DSLR (using OVF).  Plenty of exceptions to the rule(s).

Fortunately I love to shoot wide open, and am usually wide open when shooting bursts (except for being closed down for macros).

R2

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