Reading mode: Light Dark

News Reviews Articles Buying Guides Sample Images Videos Cameras Lenses Phones Printers Showcase Forums Galleries Challenges

DPReview.com is closing April 10th - Find out more

All forumsFujifilm X System / SLR TalkChange forum

Exposure is locked in afc on X-T4

Started May 13, 2021 | Questions

Forum

Threaded view

HanVroon • New Member • Posts: 14

Re: Exposure is locked in afc on X-T4 - slow exposure change in AF-C?

In reply to boogisha • Oct 26, 2021

That's weird.

With my X-T4 in AF-C mode, whether "SHUTTER AF" is set to ON or OFF, the camera changes shutter speed instantly as long as "SHUTTER AE" set to OFF.

I used fixed ISO and aperture to see the shutter speed change as the scene gets darker or brighter.

Your X-t3 behaviour doesn't seem right. Digital camera's react instant on exposure measurement, the only thing that may be slow is a hunting autofocus.

HanVroon's gear list:HanVroon's gear list

Fujifilm X-T4 Fujifilm XF 55-200mm F3.5-4.8 R LM OIS Fujifilm XF 16-80mm F4

Reply Reply with quote Reply to thread Complain

boogisha • Senior Member • Posts: 2,858

Re: Exposure is locked in afc on X-T4 - slow exposure change in AF-C?

In reply to HanVroon • Oct 26, 2021

HanVroon wrote:

That's weird.

With my X-T4 in AF-C mode, whether "SHUTTER AF" is set to ON or OFF, the camera changes shutter speed instantly as long as "SHUTTER AE" set to OFF.

Thanks for checking. Just to confirm, you are having shutter-button half-pressed, right? Because without it, exposure change is instant for me, too, as expected - but once the shutter button is half-pressed and held like that, exposure change becomes slow (smooth).

I used fixed ISO and aperture to see the shutter speed change as the scene gets darker or brighter.

I tried using the fixed ISO, but I still have the same behavior, unfortunately (using fully manual lens, my aperture is already fixed, too).

Your X-t3 behaviour doesn't seem right. Digital camera's react instant on exposure measurement, the only thing that may be slow is a hunting autofocus.

While I agree (only mine?) X-T3 doesn`t appear to work correctly here, I disagree about the rest - it was one of the firmware updates that brought "smooth" exposure change exactly, but for video (smoothing previously existing "exposure ramping"). Not sure if it didn`t introduce the bug I`m experiencing to AF-C stills at the same time.

boogisha's gear list:boogisha's gear list

Canon PowerShot A75 Canon ELPH 300 HS Canon PowerShot S120 Canon PowerShot G7 X Fujifilm X-E1 +15 more

Reply Reply with quote Reply to thread Complain

rlx • Senior Member • Posts: 1,375

Re: Exposure is locked in afc on X-T4 - slow exposure change in AF-C?

In reply to boogisha • Oct 26, 2021

boogisha wrote:

HanVroon wrote:

Today I also updated my X-T4 from 1.22 to 1.23 and indeed, the bug is fixed.

Could you please test out what I`ve reported here[1]? It`s for X-T3, but as the same bug was present there, I guess the "fix" is the same, too.

In short - in AF-C mode, with "SHUTTER AF" set to ON (for AF-C) and "SHUTTER AE" set to OFF (for AF-C), on holding shutter half-pressed and pointing camera from light to dark scene (or vice versa), exposure change is delayed and rather slow (smooth), requiring you to wait a few seconds until the exposure gets to what it should be before you can take the shot.

On the contrary, in AF-S mode, with "SHUTTER AF" set to ON (for AF-S) and "SHUTTER AE" set to OFF (for AF-S/MF), on holding shutter half-pressed and pointing camera from light to dark scene (or vice versa), exposure change is rapid - as expected, and as it should be for AF-C mode, too, I would say, allowing one to take the shot immediately, without having to wait for exposure to slowly adapt.

So even the situation is now better for AF-C, where instead of not changing at all, even with "SHUTTER AE" set to OFF (for AF-C), the exposure now does change again, but it does so very (and unnecessarily?) slowly, for some weird reason...?

Yes Boogisha, my X-T3 (FW 4.12) behaves exactly as yours. There is a long delay in AF-C while the exposure slowly adjusts if I use your settings. There is no such delay with Shutter AF set to OFF.

Reply Reply with quote Reply to thread Complain

boogisha • Senior Member • Posts: 2,858

Re: Exposure is locked in afc on X-T4 - slow exposure change in AF-C?

In reply to rlx • Oct 26, 2021

rlx wrote:

boogisha wrote:

Could you please test out what I`ve reported here[1]? It`s for X-T3, but as the same bug was present there, I guess the "fix" is the same, too.

In short - in AF-C mode, with "SHUTTER AF" set to ON (for AF-C) and "SHUTTER AE" set to OFF (for AF-C), on holding shutter half-pressed and pointing camera from light to dark scene (or vice versa), exposure change is delayed and rather slow (smooth), requiring you to wait a few seconds until the exposure gets to what it should be before you can take the shot.

Yes Boogisha, my X-T3 (FW 4.12) behaves exactly as yours. There is a long delay in AF-C while the exposure slowly adjusts if I use your settings. There is no such delay with Shutter AF set to OFF.

Thanks for confirming! So there`s some rather weird "SHUTTER AF" and "SHUTTER AE" entanglement still, for AF-C mode, former unexpectedly affecting the latter.

I`m now curious if X-T4 is better here, or just the same, possibly making a difference whether we`ll see this one fixed (and on X-T3), too... or not.

boogisha's gear list:boogisha's gear list

Canon PowerShot A75 Canon ELPH 300 HS Canon PowerShot S120 Canon PowerShot G7 X Fujifilm X-E1 +15 more

Reply Reply with quote Reply to thread Complain

Nilsa • Regular Member • Posts: 318

Re: Exposure is locked in afc on X-T4 - slow exposure change in AF-C?

In reply to boogisha • Oct 26, 2021

boogisha wrote:

rlx wrote:

boogisha wrote:

Could you please test out what I`ve reported here[1]? It`s for X-T3, but as the same bug was present there, I guess the "fix" is the same, too.

In short - in AF-C mode, with "SHUTTER AF" set to ON (for AF-C) and "SHUTTER AE" set to OFF (for AF-C), on holding shutter half-pressed and pointing camera from light to dark scene (or vice versa), exposure change is delayed and rather slow (smooth), requiring you to wait a few seconds until the exposure gets to what it should be before you can take the shot.

Yes Boogisha, my X-T3 (FW 4.12) behaves exactly as yours. There is a long delay in AF-C while the exposure slowly adjusts if I use your settings. There is no such delay with Shutter AF set to OFF.

Thanks for confirming! So there`s some rather weird "SHUTTER AF" and "SHUTTER AE" entanglement still, for AF-C mode, former unexpectedly affecting the latter.

I`m now curious if X-T4 is better here, or just the same, possibly making a difference whether we`ll see this one fixed (and on X-T3), too... or not.

Same problem with my xt4

Reply Reply with quote Reply to thread Complain

boogisha • Senior Member • Posts: 2,858

Re: Exposure is locked in afc on X-T4 - slow exposure change in AF-C?

In reply to Nilsa • Oct 26, 2021

Nilsa wrote:

boogisha wrote:

Thanks for confirming! So there`s some rather weird "SHUTTER AF" and "SHUTTER AE" entanglement still, for AF-C mode, former unexpectedly affecting the latter.

I`m now curious if X-T4 is better here, or just the same, possibly making a difference whether we`ll see this one fixed (and on X-T3), too... or not.

Same problem with my xt4

Eh, thanks for confirming, and sorry to hear that - but at least there might be some hope now that Fuji will look into it once more, addressing this leftover issue as well (and for X-T3).

boogisha's gear list:boogisha's gear list

Canon PowerShot A75 Canon ELPH 300 HS Canon PowerShot S120 Canon PowerShot G7 X Fujifilm X-E1 +15 more

Reply Reply with quote Reply to thread Complain

HanVroon • New Member • Posts: 14

Re: Exposure is locked in afc on X-T4 - slow exposure change in AF-C?

In reply to Nilsa • Oct 27, 2021

Nilsa: With firmware 1.23?

Because I (temporary) have two X-T4 bodies, both updated from 1.22 to 1.23 and the instant change of exposure that was destroyed with version 1.22 was back (in AF-C mode, with Shutter AF for AF-C set ON and Shutter AE for AF-C set Off).

Boogisha: yes, I have the shutter half-pressed.

HanVroon's gear list:HanVroon's gear list

Fujifilm X-T4 Fujifilm XF 55-200mm F3.5-4.8 R LM OIS Fujifilm XF 16-80mm F4

Reply Reply with quote Reply to thread Complain

HanVroon • New Member • Posts: 14

Re: Exposure is locked in afc on X-T4

In reply to HanVroon • Oct 28, 2021

Correction: not tested accurately enough, see my post below (October 28th).

HanVroon's gear list:HanVroon's gear list

Fujifilm X-T4 Fujifilm XF 55-200mm F3.5-4.8 R LM OIS Fujifilm XF 16-80mm F4

Reply Reply with quote Reply to thread Complain

HanVroon • New Member • Posts: 14

Re: Exposure is locked in afc on X-T4

In reply to HanVroon • Oct 28, 2021

Boogisha was right, exposure adjustment moving from a dark to bright scene with the shutter half-pressed is delayed. Sorry for the inconvenience.

I must have not tested accurately enough at first. I did much more tests in the last two days, and especially when I started zooming in making changes in brightness more emphatic, I also notice the delay.

I found out that when using Pre-AF ON together with Shutter AF in AF-C mode Off, the desired behaviour can be "simulated".

So:
Setup, Button/Dial settings: Shutter AF, AF-C to Off.
Setup, Button/Dial settings: Shutter AE, AF-C to Off.
AF/MF Settings, Pre-AF to On.

This is not a combination of settings you want to keep (Pre-AF On), but at least it shows that the camera is capable setting the right exposure instantly instead of with a delay, and still have Auto Focus.

So we have to start bug reporting again...
Wish I could go back to an older firmware, like I was able to with my Garmin GPS device.

Regards.

HanVroon's gear list:HanVroon's gear list

Fujifilm X-T4 Fujifilm XF 55-200mm F3.5-4.8 R LM OIS Fujifilm XF 16-80mm F4

Reply Reply with quote Reply to thread Complain

IkeofKC • New Member • Posts: 9

Re: Exposure is locked in afc on X-T4

In reply to HanVroon • Jan 23, 2022

Is there a bug reporting page, or an existing bug we can add a +1 to?
This is so annoying that I might sell both my x-t4 and x-t3 and chill with my x-h1 that isn't broken.

Reply Reply with quote Reply to thread Complain

rlx • Senior Member • Posts: 1,375

Re: Exposure is locked in afc on X-T4

In reply to IkeofKC • Jan 23, 2022

IkeofKC wrote:

Is there a bug reporting page, or an existing bug we can add a +1 to?
This is so annoying that I might sell both my x-t4 and x-t3 and chill with my x-h1 that isn't broken.

What I did last time I found what I believed was a software bug.

Try to have all the facts well spelled out in a forum thread,
Write a good short summary and include a reference to the most detailed forum posts. Add a few pictures to make your point very clear. Explain how to reproduce the faulty behavior.
Send an email to the nearest Fuji-repair location with your bug report attached and tell them you have a problem that looks like a software bug. Ask them to forward everything to the software developer.

The answer I got was that the report was sent as I asked. There was no further answer from them. However the bug was fixed in a firmware release four months later. There was no acknowledgement of the bug and no reference to it; just a mention of "various optimizations" or something like that.

So I can't tell if the fix came up as a result of my report or if it was just a coincidence.

Good luck.

Reply Reply with quote Reply to thread Complain

IkeofKC • New Member • Posts: 9

Re: Exposure is locked in afc on X-T4

In reply to rlx • Jan 25, 2022

rlx wrote:

IkeofKC wrote:

Is there a bug reporting page, or an existing bug we can add a +1 to?
This is so annoying that I might sell both my x-t4 and x-t3 and chill with my x-h1 that isn't broken.

What I did last time I found what I believed was a software bug.

Try to have all the facts well spelled out in a forum thread,

Write a good short summary and include a reference to the most detailed forum posts. Add a few pictures to make your point very clear. Explain how to reproduce the faulty behavior.

Send an email to the nearest Fuji-repair location with your bug report attached and tell them you have a problem that looks like a software bug. Ask them to forward everything to the software developer.

The answer I got was that the report was sent as I asked. There was no further answer from them. However the bug was fixed in a firmware release four months later. There was no acknowledgement of the bug and no reference to it; just a mention of "various optimizations" or something like that.

So I can't tell if the fix came up as a result of my report or if it was just a coincidence.

Good luck.

Thank you. I'll try that out.
I do wish there was an official bug reporter link for X-Cameras

Reply Reply with quote Reply to thread Complain

IkeofKC • New Member • Posts: 9

Re: Exposure is locked in afc on X-T4

In reply to IkeofKC • 10 months ago

Anybody try the new firmware yet to see if this is now fixed?

Reply Reply with quote Reply to thread Complain

Forum

Threaded view

Keyboard shortcuts:

FForum MMy threads

Latest sample galleries

Nikkor 58mm F0.95 Noct Sample Gallery

Sony ZV-E1 pre-production sample gallery (DPReview TV)

The Canon EOS R3 goes to the rodeo

Fujifilm X-H2 review samples

See more galleries »

Latest in-depth reviews

DPReview TV: Nikon 58mm F0.95 Noct Review!

We're Noct messing around with this review.

DxO PureRAW 3 review: Give Adobe's apps a much-needed boost with modern AI algorithms

Adobe Photoshop and Lightroom impress in a lot of ways, but their noise reduction lags the competition and their lens corrections lack a real-world basis. DxO PureRAW 3 aims to come to their rescue without totally reinventing your workflow!

The Sony ZV-E1 is the company's latest vlogging-focused camera: a full-frame mirrorless camera based the FX3/a7S III sensor, aimed at YouTubers and 'creators' looking to go pro.

The Sony ZV-E1 is a full frame camera targeting YouTubers. Chris and Jordan are Youtubers, what do they think?

Review: Holy Stone's HS710 and HS175D are drones with a ton of limitations

Holy Stone produces dozens of low-cost drone models aimed at consumers. We look at the HS710 and HS175D to see if they stack up to other sub-250g offerings. Are these secretly great or more like toys?

Latest buying guides

Above $2500 cameras tend to become increasingly specialized, making it difficult to select a 'best' option. We case our eye over the options costing more than $2500 but less than $4000, to find the best all-rounder.

There are a lot of photo/video cameras that have found a role as B-cameras on professional film productions or even A-cameras for amateur and independent productions. We've combed through the options and selected our two favorite cameras in this class.

What’s the best camera for around $2000? These capable cameras should be solid and well-built, have both the speed and focus to capture fast action and offer professional-level image quality. In this buying guide we’ve rounded up all the current interchangeable lens cameras costing around $2000 and recommended the best.

The best cameras for family and friends photos in 2022

Family moments are precious and sometimes you want to capture that time spent with loved ones or friends in better quality than your phone can manage. We've selected a group of cameras that are easy to keep with you, and that can adapt to take photos wherever and whenever something memorable happens.

Best affordable cameras for sports and action in 2022

What's the best camera for shooting sports and action? Fast continuous shooting, reliable autofocus and great battery life are just three of the most important factors. In this buying guide we've rounded-up several great cameras for shooting sports and action, and recommended the best.

Check out more buying guides »

www.dpreview.com

Mobile site

About

Editorial content

Cameras & Lenses

Community

All content, design, and layout are Copyright © 1998–2023 Digital Photography Review All Rights Reserved.
Reproduction in whole or part in any form or medium without specific written permission is prohibited.


Fujifilm X-H2 in-depth review Mar 20, 2023	Fujifilm X-T5 production sample gallery Feb 26, 2023	DPReview TV: Fujifilm X-T5 Final Review Feb 25, 2023	Testing the Fujifilm 56mm F1.2 WR for use as our studio lens Jan 23, 2023


Spending a Penny by Lensmate from Faeces	The food transfer by dv312 from A Big Year 2023	Mike and the FWS1000 by GeoffN from Scooters/Motorbikes in motion	The end of another day by io_bg from Good Night	Brazilian Gripen by Johnson Barros from Fast Jet With Wheels On The Ground	CURIOSITY by TX Photo Doc from Fleeting Moments

20	X-H2s - Probably not so Happy easter for the bunny
16	XF 10-24 : edges very (very) soft
11	X-H2s firmware 4.01 released
7	Can someone who owns the 50mm 1.0 help please?
7	live lcd
5	decent mic?
5	Incoming Yellow Crowned Night Heron
5	Fuji X limited availability on camera bodies?
4	Fuji lens for scanning
3	Wireless ipad image review?
3	Good night challenge won by the good ol' X-T30
3	Today’s Bees [X-T5, Sigma 18-50]
3	Which custom film simulation recipes for XF1?
3	Help connecting a XH-2S with a MacBook Pro
3	Battery life with Fuji x-T30
2	(The First) Ten years with my X-E1
2	Addicted to this
2	At the end of the dp-rope ... (14 pix)
2	Old testreports
2	Fujifilm display options (XT5)

8	A decent baseline for Fujifilm X-T4 video recording (for video beginners)
6	Copy/copy variation - collection of 'SOPs' - Quick decentering test
5	Tips For Better Subject Detection for Wildlife and Birds
5	Re: Hugh Brownstone's review of Sigma's 18-50mm f/2.8 DC DN (vs XF 16-55 f/2.8)
4	Re: Fuji XH2s autofocus tracking for Birds/wildlife in action
4	A Little Fun With a Lightbulb

53	Morris0
31	John Gellings
29	Jerry-astro
29	Erik Baumgartner
28	DarnGoodPhotos
23	BobsYourUncle
18	Alan Hewitt Photo
17	And-roid
16	Birddogman
14	jhorse
14	Rod McD
13	SigmaChrome
13	Threaded
12	KariP
12	nightowlnz
11	D200_4me
11	biza43
11	deednets
11	Clive99
11	sprouty115

Exposure is locked in afc on X-T4

You may also like

Latest sample galleries

Latest in-depth reviews

Latest buying guides