MEF is Mamiya's RAW format, used by their medium format digital camera systems to store unprocessed sensor data with maximum editing flexibility for exposure, white balance, and color correction. Like other camera RAW formats, MEF files require demosaicing before they're viewable, and since they aren't supported by browsers, photo viewers, or social platforms, converting to JPG is the practical way to view or share them.
Converting MEF to JPG performs that demosaicing and compresses the result into a small, universally compatible file, which is the standard step once a Mamiya medium format shoot has been edited and is ready for client delivery or general viewing.
- Install Batchify Raw Image Converter on your Windows PC.
- Open the app and select Batch Mode for an entire shoot, or Individual Mode for a single MEF file.
- Drag your MEF files or folder into the app window, enabling recursive folder scanning if needed.
- Set the "From" format to MEF and the "To" format to JPG.
- Adjust the JPG quality slider to balance file size against image detail.
- Click Convert. JPG files are written to your output folder, fully offline.
- Native support for Mamiya's MEF RAW format
- Bulk-convert an entire medium format shoot in one batch
- Adjustable JPG compression for client delivery or web use
- Runs fully offline, keeping unreleased commercial work private
- Multi-core processing for fast handling of large medium format files
Does converting MEF to JPG affect my original files?
No, the converter reads your MEF files and writes new JPG files to your chosen output folder, leaving the original RAW files untouched.
Which cameras produce MEF files?
MEF is Mamiya's RAW format, used by their medium format digital camera systems.
Can I convert an entire shoot of MEF files at once?
Yes, Batch Mode processes an entire folder of MEF files in one pass, including nested sub-folders if recursive scanning is enabled.
Ready to convert your RAW camera files offline, in bulk, with full privacy?