Question about Canon Telephoto EF 300mm f/2.8L IS Image Stabilizer USM Autofocus Lens

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Front focus problem

Could you please explain the operation of the 'focus preset switch'.

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Hey hubro,
This switch is used to set a focus point to so you can quickly focus to the preset distance. What you have to do is set the switch to the on or on with sound setting then focus to the distance you want to preset and then press the set button. While this switch is set to the on or on with sound setting you just turn the focus preset ring which should be in front of the focusing ring and the camera should focus to the preset distance. I hope this helps!

Sincerely,
Allan
Go Ahead. Use Us.

Posted on Jul 23, 2008

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