Quick Summary
- Apple added native support for Nikon Z8 NEF files starting in macOS Sonoma 14.3 — but only for Lossless Compressed RAWs.
- If you shoot using Nikon’s High Efficiency (HE or HE*) formats, macOS still cannot natively read them. They will throw an “unsupported format” error in Finder and Preview.
- Major RAW processing apps like Lightroom and Capture One fully support all versions of Z8 files.
- If you don’t use those paid apps, there are two free workarounds: Nikon NX Studio or the Adobe DNG Converter (though the latter comes with severe file-bloat issues).
If you’ve tried opening NEF files from your Nikon Z8 on a Mac through Finder or Preview and been hit with a “this file format is not supported” error, you aren’t alone. It’s an incredibly frustrating workflow bottleneck, especially when you just want to quickly cull a memory card without opening a heavy editing app.
The confusion usually stems from the fact that Apple did release an update that supposedly added support for the Z8. But that update came with a massive catch that trips up a lot of photographers.
The High Efficiency (HE*) trap
Not all NEF files are the same under the hood. When you shoot RAW on the Z8, the camera gives you three compression choices in the menu: Lossless Compressed, High Efficiency Star (HE*), and High Efficiency (HE).
Here is the reality of macOS compatibility right now:
- Lossless Compressed: Fully supported by Apple. These will open perfectly in Finder, Preview, and Apple Photos.
- High Efficiency (HE and HE*): Completely unsupported natively. These will throw an error.
Because the HE* format uses a proprietary compression algorithm (licensed from intoPIX), Apple hasn’t integrated it at the operating system level. Since HE* offers practically identical image quality to Lossless but at half the file size (~30MB vs ~60MB), it’s the go-to setting for many Z8 shooters. If you shoot HE*, you’re going to hit this macOS wall.
You might not even notice this problem if your workflow relies heavily on apps like Lightroom Classic or Capture One. Adobe and Phase One build their own RAW engines, so they bypass Apple’s operating system entirely and can read HE* files without breaking a sweat.
Two free workarounds for HE* files
If you don’t use a paid third-party processor, or if you’re using an older version of software that hasn’t been updated in years, you still have a couple of free ways to access your images.
1. Nikon NX Studio
Nikon has its own RAW processing app called NX Studio. You can download it for free here.
For obvious reasons, Nikon’s own software can natively read every flavor of compression the Z8 outputs. I don’t routinely use NX Studio as my primary editor, but I appreciate that it’s available as a reliable, free option to quickly preview and export HE* files if you’re in a bind.
2. Adobe DNG Converter (with a warning)
If you prefer to keep using your legacy editing software (like a standalone, pre-subscription version of Lightroom 6), you can download Adobe’s free DNG Converter. This strips the proprietary Nikon wrapper off the file and converts it into an open-source Digital Negative (DNG) that almost any app can read.
The Storage Warning: While this works perfectly from an image quality standpoint, it destroys the primary benefit of shooting HE* in the first place — storage efficiency. When Adobe converts a 30MB HE* file, it often unpacks it into an uncompressed linear DNG. I’ve routinely seen those converted files balloon to over 100MB per image. If you convert an entire wedding or wildlife shoot this way, you’ll eat through your hard drive space incredibly fast.
Wrap up
Until Apple decides to license and integrate High Efficiency RAW support directly into macOS, Z8 and Z9 users have to choose their workflow carefully.
You can shoot Lossless Compressed to ensure your files are instantly readable on your Mac, at the cost of your memory cards and hard drives filling up twice as fast. Or, you can shoot HE* to save space, knowing you’ll have to rely entirely on third-party software like Lightroom, Capture One, or NX Studio to view and manage your archive.
