Shooting at f/11 on x-t2 and using Phase detect

[drandyperry]

Hi,

Had a weekend shooting with my x-t2, 50-140 and 2x TC at Le Mans. My first sports application with the xt2. Loved the speed of it but I have one question.

It was very sunny, with the base iso of 200 (I was shooting raw +jpg so iso 100 didn't work) I was having problems slowing my shutter speed down to get background blur in the cars. If I went smaller than f/8 then my phase detect Af didn't work and it dropped down to contrast detection AF which wasn't fast enough to track the cars (I did try it).

 

Most dslrs will focus in with the lens wide open and then only shut the aperture down when the shot is taken. Is there a way to do this with the xt2? I'd be happy in mechanical shutter mode. I tried turning off exposure and wb preview but the lens still sat at its set aperture the whole time.

 

Any advice is appreciated. If it's not possible I'll invest in a couple of nd filters to allow me to do this.

 

Thanks,

Andy

Edited June 25, 2017 by drandyperry

[Doug Pardee]

You are, unfortunately, correct. Fujifilm AF operates stopped down in AF-C mode, and the PDAF sensors are only rated for f/8. At f/9 or above, CDAF is used exclusively.

 

In AF-S mode, AF is done with the lens wide open, so this isn't a problem.

 

In AF-M mode, the Instant AF feature behaves exactly the same. If it's configured for AF-C, the AF is performed stopped down and PDAF is only available up to f/8. If it's configured for AF-S, the AF is performed with the lens wide open.

[drandyperry]

You are, unfortunately, correct. Fujifilm AF operates stopped down in AF-C mode, and the PDAF sensors are only rated for f/8. At f/9 or above, CDAF is used exclusively.

 

In AF-S mode, AF is done with the lens wide open, so this isn't a problem.

 

In AF-M mode, the Instant AF feature behaves exactly the same. If it's configured for AF-C, the AF is performed stopped down and PDAF is only available up to f/8. If it's configured for AF-S, the AF is performed with the lens wide open.

Thanks for that, at least it's not me choosing it in the menu and not realising it.

That's a bit of a limitation. Looks like I'll be getting myself some nd filters. It'd also be good if you could use the low iso setting and save raw files.

 

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[Doug Pardee]

It'd also be good if you could use the low iso setting and save raw files.

 

You should be able to do that on the X-T2. And the X-Pro2, X-T20, and X100F.

 

Be careful of blown highlights, though.

[drandyperry]

Ahhh, found out why it wouldn't work for me. Apparently you can only use iso 100 with a mechanical shutter. I was mainly using electronic shutter. Doh.

 

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