FoCal 4.0.1 – macOS fixes, core updates

FoCal 4.0.1 brings fixes for operation on macOS Sonoma, security updates and improvements to the core of FoCal, along with a number of minor bug fixes.

FoCal splash screen overlaid with 4.0.1 for this release

How to get FoCal 4.0.1

FoCal 4.0.1 is available to everyone within their support period as of 20th November 2023 (so that’s everyone who’s purchased FoCal Pro or a new Included Updates Period since 20th November 2022).

You can download it by logging in to your FoCal Account and choosing the download for your platform.

What’s New in FoCal 4.0.1

macOS Sonoma Camera Detection Fix

FoCal 4.0 was released shortly after macOS Sonoma, and on certain machines there is a combination of bugs in macOS and FoCal which meant that FoCal never requested permissions to communicate with a USB connected camera. The end result was no cameras showing up in FoCal for connection.

This issue is now fixed in FoCal as long as you’re using macOS 14.2.1 or newer. Note that this issue does not affect previous versions of macOS, so if you’re running macOS Ventura or older, there’s no need to update your operating system.

Core Updates

FoCal 4.0.1 brings another update to the core framework we use, so we’re now bang up to date with the latest, long-term supported libraries.

What does this mean for you?

Well, immediately it’ll result in faster, more secure code and smaller binaries. FoCal will be more efficient, using less battery power on mobile devices, and operation will be smoother, faster and more secure.

Going forward, now we’re fully up to date, we’ll be getting new features into FoCal very soon.

Security Updates

Using the new core framework brings security updates to FoCal, but we’ve also updated a few third-party libraries which have been found to have security vulnerabilities. So FoCal is now more secure than ever!

Bug Fixes

There’s always bugs to fix, and we’ve fixed a few in this release. These are mostly minor user-interface fixes, but there are also a few camera control fixes to make operation more reliable.

Operating System Support

See below for information about which versions of operating system are supported.


The following versions of Windows (64-bit) are supported

  • Windows 11
  • Windows 10 (20H2 and later)

FoCal can be installed and should work on the following versions of Windows, but as they are no longer supported by Microsoft we only do limited testing:

  • Windows 10 (pre 20H2) – Microsoft support ended 10th May 2022
  • Windows 8.1 – Microsoft support ended 9th January 2018
  • Windows 7 SP1 – Microsoft support ended 13th January 2015


The following versions of macOS are supported

  • macOS Sonoma (14.x)*
  • macOS Ventura (13.x)
  • macOS Monterey (12.x)
  • macOS Big Sur (11.x)

* Note: Due to a bug in macOS, cameras may not show for connection in FoCal on versions of macOS older than 14.2.1. Update to FoCal 14.2.1 (December 2023) and use FoCal 4.0.1 or later to fix this issue.

FoCal 3.x can be installed and should work on the following versions of macOS, but as they are no longer supported by Apple we only do limited testing:

  • macOS Catalina (10.15) – Apple support ended 12th September 2022
  • macOS Mojave (10.14) – Apple support ended 25th October 2021
  • macOS High Sierra (10.13) – Apple support ended 1st December 2020
  • macOS Sierra (10.12) – Apple support ended 1st October 2019

iPhone and iPad

FoCal Mobile will run on any device running iOS/iPadOS 12 or later.


The Android version of FoCal Mobile can be installed on all devices running Android 9 (Pie) or later.

There is a huge variety of Android devices and we can only test on a small subset. FoCal is an intensive application and we recommend using newer mid- to high-end Android devices with at least 4GB of RAM.

NOTE: The free version of FoCal Mobile offers the ability to connect to a camera, Verify Setup and run AF System Check, so you should ensure that these all run reliably before purchasing a subscription.

Release Notes

There are more details in the changelog in the release notes for this release.

Thank you!

Thank you to all our users past and present who’ve used FoCal for their calibrations. An extra special thank you to everyone who’s got in touch with feedback, a lot of changes are driven directly by what you tell us!

Get Reikan FoCal 4.0.1

FoCal 4.0.1 is available to all users within their Included Updates Period as of 20th November 2023. You can get the software as shown below:

  • By logging in to the FoCal Account system via
  • Go to the About > Update Check option in the software. From here you can hit the Download button to get the software.

If you’re outside of the period above you can purchase 12 months of updates by logging in to the account system via and scrolling to Included Updates Period.

If you’re not yet a FoCal user, you can purchase the software as a download or boxed product, as well as FoCal Hard Targets from the FoCal Online Store.

Get FoCal Apps

Information and store links for the FoCal mobile apps are available here:

Reikan FoCal on Social Media

We regularly post news and updates on social media. You can keep updated, connect and follow us via:

Leave a Reply

Your email address will not be published. Required fields are marked *