Canon HF-DC1 High Power Flash for Canon Powershot Digital Cameras

Compact and elegantly designed, the High-Power Flash HF-DC1* requires no accessory shoe. It has a strong light output at guide number 59 (ISO 100 in ft.) and a wide 28mm angular field (35mm film equivalent) for proper illumination up to approximately 30 feet. To cover an even wider field, the High-Power Flash HF-DC2** supports models with a maximum wide-angle focal length of 24mm. It has an output guide number of 59 (ISO 100 in ft.) or 34.4 (ISO 100 in ft.) when the wide panel is attached.

* Compatible with all PowerShot models except G1 X Mark II, S120, SX50 HS, SX510 HS,SX700 HS, SX600 HS, N100, N, ELPH 340 HS and ELPH 150 IS.
** Compatible with all PowerShot models except G1 X Mark II, SX50 HS, SX700 HS and N.

Source: Canon USA