Does the job well

The 90EX flash is designed to be used with the Canon EOS-M mirrorless camera which does not have an inbuilt flash. The unit is tiny and very lightweight making it easy to carry around so it suits the equally diminutive and convenient EOS-M camera. Despite being tiny, the flash is sturdy and well-made as is typical of Canon. The flash uses commonly available AAA batteries so there's no worries about carrying an extra charger. Of course, it's not a lighting powerhouse but it's more than adequate for everyday work. If you need more light then you can simply use additional Canon flash units ... one of the advantages of buying into a system rather than just a product. If you own a Canon EOS-M camera then this really should be a "must have" accessory. I wouldn't be without it.

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