ERF files are generated by the Epson R-D1 and R-D1s digital rangefinder cameras.

EPSON is no longer in that business so no other camera use that format.

MIME Type

image/x-epson-erf

Organisation

Epson ERF files are TIFF/EP files. CFA data is in the primary subIFD from IFD0. Thumbnail is 8RGB in IFD0. Exif is attached to the ExifIFD of IFD0.

Compression

The CFA image data is “compressed”, bit packed. The Compression value in the CFA subIFD is set to 32769.