firmware issue Autofocus Problems on X-Processor 5 Cameras After Firmware U

[Ewelina Czosnek]

Hi everyone,

I’m reaching out to see if anyone else is experiencing the same issue.

I own a Fujifilm X-S20 and recently updated the firmware to version 3.10, which includes changes to the AF algorithm. Since the update, I’ve been having major autofocus issues with my Tamron 18-300mm lens – the camera often struggles to focus, even on static subjects.

What’s strange is that the same lens works perfectly on my older X-S10, which hasn’t received any similar AF updates (X-Processor 4). So this clearly seems to be a compatibility issue introduced with the latest AF algorithm changes in X-Processor 5 cameras.

I’ve confirmed this across multiple bodies:

• X-S20 – firmware 3.10 – autofocus issues

• X-T5 – firmware 4.10 – same problem

• X-H2 – firmware 5.10 – includes the same AF update

• X-H2S – firmware 7.10 – also mentions AF revision

• X-T50 – firmware 1.10 – same story

• X100VI (X-M5) – most likely shipped with the new AF system pre-installed

In contrast, cameras with X-Processor 4 (like the X-S10 and X-T4) still work flawlessly with the same lens. That pretty much confirms the issue lies in the updated AF logic, not the hardware itself.

My partner owns an X-H2 and is now hesitant to update the firmware because of how badly my X-S20 now performs. We’ve both contacted Tamron and Fujifilm support, but haven’t received any real solution so far.

Is anyone else dealing with this? Have you found a workaround or received any response from either company?

If Tamron doesn’t release a firmware update for this lens, it may become unusable on the latest Fuji bodies — which is incredibly frustrating.

Thanks in advance!

Edited April 15 by Ewelina Czosnek
translated

[Olaf W.]

Welcome. Since this an international forum it would be nice to provide a translation.

[pw-pix]

Here it is translated.

"Hi to everyone,

I'm contacting you to find out if anyone else has a similar problem.

I have a Fujifilm X-S20 and recently updated the software to version 3.10, which includes changes to the AF algorithm. Since the update, I have serious autofocus problems in my Tamron 18-300 mm lens – the camera often has problems with focusing, even on stationary objects.

The strange thing is that the same lens works perfectly on my older X-S10, which has not received any similar AF updates (X-Processor 4). So this apparently seems to be a compliance problem introduced with the latest changes to the AF algorithm in X-Processor 5 cameras.

I have confirmed this in many bodies:

    X-S20 – firmware 3.10 – autofocus problems

    X-T5 – firmware 4.10 – same problem

    X-H2 – firmware 5.10 – includes the same AF update

    X-H2S – firmware 7.10 – also mentions the revision of AF

    X-T50 – software 1.10 – same story

    X-M5 – most likely supplied with the pre-installed new AF system

Cameras with the X-Processor 4 processor (like the X-S10 and X-T4) still work flawlessly with the same lens. This basically confirms that the problem lies in the updated AF logic, not in the hardware itself.

My partner has an X-H2 and now hesitancyly whether to update the firmware because my X-S20 is working so bad now. We have contacted Tamron and Fujifilm technical support, but so far we have not received any real solution.

Does anyone else have to do this? Have you found a bypass or received a response from any of the companies?

If Tamron doesn’t release a software update for this lens, it could become useless on Fuji’s newest body — which is extremely frustrating.

Thank you in advance!"

[pw-pix]

Tamron have a page that states there may not be full operational compatibility with a long list of Fuji X cameras.

https://www.tamron.com/global/consumer/support/fujifilm_x/compatibility_with_cameras.html

Tamron firmware page for the lens in Fuji X mount shows the last firmware update was in 2022.

https://www.tamron.com/global/consumer/support/download/firmware/b061/fujifilm_x/

Some of the Fuji X cameras you list have had more recent firmware versions, but not your X-S20.

 

 

[Ewelina Czosnek]

17 hours ago, Olaf W. said:

Witamy. Ponieważ jest to forum międzynarodowe, byłoby miło zapewnić tłumaczenie.

"This is my first time here and I didn’t know I was supposed to provide a translation. I specifically wrote my post in an international language — English — so that everyone can understand it or translate it into their native language."

[Ewelina Czosnek]

15 hours ago, pw-pix said:

Tamron have a page that states there may not be full operational compatibility with a long list of Fuji X cameras.

https://www.tamron.com/global/consumer/support/fujifilm_x/compatibility_with_cameras.html

Tamron firmware page for the lens in Fuji X mount shows the last firmware update was in 2022.

https://www.tamron.com/global/consumer/support/download/firmware/b061/fujifilm_x/

Some of the Fuji X cameras you list have had more recent firmware versions, but not your X-S20.

 

 

Thanks for your reply, but I’m already aware of those links.
The issue I’m reporting is not about general compatibility or outdated firmware on the lens. The Tamron lens worked perfectly with older Fuji bodies like the X-S10 and X-T4.

The problem started only after Fujifilm introduced changes to the autofocus algorithm in the latest firmware updates for X-Processor 5 cameras (like the X-S20, X-T5, X-H2, etc.). This is a recent issue and it’s unrelated to Tamron’s last firmware update in 2022 — which is exactly why I'm trying to raise awareness and push for a new update.

I’ve tested the lens across multiple bodies and firmware versions — this is not a one-off issue, but a clear compatibility gap created by recent Fuji firmware updates. Tamron simply needs to update their lens firmware accordingly.

[Olaf W.]

2 hours ago, Ewelina Czosnek said:

I specifically wrote my post in an international language — English —

You didn‘t, obviously. 

[Ewelina Czosnek]

On 4/9/2025 at 5:53 PM, Olaf W. said:

You didn‘t, obviously. 

So tell me what language I wrote in. Or just turn off automatic translation and you'll have everything in English.

[jerryy]

Your message posted in Polish:

Welcome, dear visitor! As registered member you'd see an image here…

Simply register for free here – We are always happy to welcome new members!

But @pw-pix was kind enough to translate it for us.

Edited April 10 by jerryy

[Ewelina Czosnek]

On 4/10/2025 at 9:56 PM, jerryy said:

Your message posted in Polish:

Welcome, dear visitor! As registered member you'd see an image here…

Simply register for free here – We are always happy to welcome new members!

But @pw-pix was kind enough to translate it for us.

Ok, Done, Translated. SOrry

[TheR1D2]

I'm torn between a Nikon Zf, Nikon Z5ii, and an XT-5 because all fall in similar price range. I'm gravitating towards the XT-5 for the form factor and lens choices, but the autofocus issues I keep hearing is holding me back. So would like to know more from real users on your experiences?

My use case: Street, and Landscape photography.

[pw-pix]

6 hours ago, TheR1D2 said:

My use case: Street, and Landscape photography.

The X-T5 is fine for that sort of use with the current firmware, use it in AF-S and either a single AF point or a small zone. It's in AF-C that the issues are more apparent.

[SWSD]

Hi, just got a Tamron 18-300m yesterday and found this forum.

It worked well on my X-T2. On the X-T4 it would not focus between 60-299mm.

I bought if for an Iceland trip and was mad. Happily i had some hope after reading this page, I have changed the settings to use a Zone AF and turned off face detection. It now focuses on the X-T4. Both lens and X-T4 are on the latest firmware.

Just joined the forum, not sure if this is the best thread to ask on, I searched. 

The Tamson 18-300mm seems very unstable at 300mm, I know its long, are you guys using a tripod at that length for stability?

I am planning on taking it to iceland for tele shots, but if its this unstable at 300mm, i will have to get a lens collar and another tripod for it to get sharp images.

Does anyone have any experience / advice in the field with this lens? My old Canon 70-300mm IS lens seemed more stable hand held. 

I dont want to come back from Iceland after using it and binning all the shots from it due to the IS not being great handheld.

Cheers, Steve

Update, seems the focus went on each body again. 
turning it of and on again on the xT2, and it’s working again. 
I  wonder if it cannot handle a focus mode switch? Or some other setting changes while it is on?

Did anyone check this? 
obviously it’s not acceptable, but it seems to be linked to some change during use. If I work it out, at least I can mitigate its problems. 
 

Steve

 

 

Edited August 1 by SWSD