Beginner Auto Focus speed and aperture.

[Baloo]

Does the aperture you are using effect the speed of autofocus?

Have been quite successful with my E520 and V1 focusing on model gliders, however this week I was having difficulty focusing. At first I thought it was a problem with the camera and checked all my settings,(Focus mode etc) then the V1 was giving issues as well. It wasn't until after the session I thought about what I was doing different. I normally shoot on 1/1000th to freeze the model which can be going up to 150mph, because I havn't been very worried about image quality I have been shooting with a high ISO but lately I have tried to shoot at 100 ISO. Could this be affecting the speed of autofocus, any advice gratefully received.

I would of thought the wider open the lens the easier for the camera to focus

Roger

 

[Graham W]

Not really. Whatever aperture you select doesn't come into effect until you actually fire the shutter, ie after the camera has locked focus.
The aperture (Iris) blades stay "Wide open" during composition and focusing to give the brightest image in the viewfinder.
Hope that helps.

 

[Baloo]

Thanks Graham, I thought I might be clutching at straws!