# man > Image::ExifTool::Unknown(3pm)

## NAME
    [Image::ExifTool::Unknown](https://www.chedong.com/phpMan.php/perldoc/Image%3A%3AExifTool%3A%3AUnknown/markdown) - Unknown EXIF maker notes tags

## SYNOPSIS
    This module is loaded automatically by [Image::ExifTool](https://www.chedong.com/phpMan.php/perldoc/Image%3A%3AExifTool/markdown) when required.

## DESCRIPTION
    [Image::ExifTool](https://www.chedong.com/phpMan.php/perldoc/Image%3A%3AExifTool/markdown) has definitions for the maker notes from many manufacturers, however information
    can sometimes be extracted from unknown manufacturers if the maker notes are in standard IFD
    format. This module contains the definitions necessary for [Image::ExifTool](https://www.chedong.com/phpMan.php/perldoc/Image%3A%3AExifTool/markdown) to read the maker
    notes from unknown manufacturers.

## AUTHOR
    Copyright 2003-2022, Phil Harvey (philharvey66 at gmail.com)

    This library is free software; you can redistribute it and/or modify it under the same terms as
    Perl itself.

## SEE ALSO
    "Unknown Tags" in [Image::ExifTool::TagNames](https://www.chedong.com/phpMan.php/perldoc/Image%3A%3AExifTool%3A%3ATagNames/markdown), Image::[ExifTool(3pm)](https://www.chedong.com/phpMan.php/man/ExifTool/3pm/markdown)