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| p.1 #1 · p.1 #1 · What's the deal with aperture stopping down during AF? |
Coming from the DSLR world, I always assumed that each lens would only gets stopped down when the actual exposure is being made. Until about a year ago I didn't realize that the aperture of some Sony FE lenses does get stopped down to the shooting aperture even before hand and while the lens is trying to AF. Well, depending on the lighting conditions and aperture used, the AF may struggle. I noticed that a few times but I didn't think much about it until yesterday. Granted, this situation doesn't come up that often but the only advantage I could see from that design is for rapid shooting, like in sport or wildlife photography. Let's face it, the way the camera system is now, those are the two areas of photography that this mirrorless system is not known for .
Case in point, I was trying to get a sunstar of a fairly low setting sun in my composition by stopping down to f/16 yesterday. Yes, the lighting was not super bright, hence the low setting sun but plenty bright. I used my Batis 25mm for that and it struggled to lock on focus and apparently it gave up after a while. So, I opened up the aperture to f/8 and it locked focus without any issues and then I stopped down the camera. I did take a single shot when after the AF gave up and the image was blurry. And that at f/16 using a 25mm lens - what the heck? Yes, you can work around this "issue" but it shouldn't be an issue to begin with if the system just follows or copies that of the DSLR world. Stop down the lens when the actual exposure is being made but open it up prior to that. Unless this system is designed for a super fast camera system of the future. Yes, a futuristic super fast mirrorless camera without aperture stopped down for a 25 fps maybe.... .
Any thoughts on this, folks?
Edited on Mar 21, 2017 at 12:52 PM · View previous versions