Comments on: Trouble Focusing? Zoom in – Accessible Photography Tip

By: Abid

Abid — Wed, 29 Jul 2009 01:11:29 +0000

Normally, most reviews cover this. Google the lens name and “parfocal” to see if it’s parfocal or not.

Most Canon “L” lenses are parfocal whereas most cheap zooms are not.

By: Tim

Tim — Mon, 27 Jul 2009 23:01:05 +0000

I did not know that. The question then becomes how to know if a particular lens is parfocal. Any suggestions?

Thank you for clarifying this!

By: Abid

Abid — Mon, 27 Jul 2009 22:54:12 +0000

Excellent article. I found your website through Digg.com.

The technique listed in the article won’t work if your lens is not parfocal. Non-parfocal lenses get out of focus upon changing of focal length. So if you zoom in, then focus, and then zoom out, the subject will still be out of focus.