Is the 24-105 f/4 IS parfocal?

Started Jan 21, 2006 | Discussions thread
OP Arjen van Andel Contributing Member • Posts: 594
Update - List of parfocal Canon zooms

http://www.rogercavanagh.com/helpinfo/30_parfocal.stm

According to this (old) list, the 70-200 f2.8L IS/non-IS USM and 70-200 f4L are parfocal, as is the former version of the 70-300 IS USM non-DO, the 75-300 IS USM and its relatives. The kitlens, and the new 24-105L and 70-300 IS aren't mentioned, since the list is a bit dated (2003).

It also states that: "Parfocal zooms in the Canon EF lens line-up are essentially limited to the fixed-aperture L-series categories and front-focusing zoom lenses."

Also: "EF zoom lenses with Super Inner Cam focusing, which include most of the non-L zooms introduced from 1990 onwards as well as the EF 35-350mm f/3.5-5.6L USM and the EF 100-400mm f/4.5-5.6L IS USM, are not parfocal."

A (non exhaustive) list of parfocal lenses provided by Chuck Westfall a few years ago:

EF 16-35mm f/2.8L USM
EF 17-40mm f/4L USM
EF 24-70mm f/2.8L USM
EF 70-200mm f/2.8L USM
EF 70-200mm f/2.8L IS USM
EF 70-200mm f/4L USM
EF 75-300mm f/4-5.6 IS USM
EF 75-300mm f/4-5.6 III USM
EF 75-300mm f/4-5.6 III
EF 90-300mm f/4.5-5.6 USM
EF 90-300mm f/4.5-5.6

The 18-55 kitlens is a front-focusing lens. I finally found the paper sheet that passes as its manual and it says not to change zoom after focusing.

Somebody in this tread claimed the 70-200 f/2.8 also has that line in its manual.

Here an also old, but nonetheless interesting, discussion about this topic:

http://www.fredmiranda.com/forum/viewtopic_archives.php?TopicID=13901&page=0#121672
And here:

http://www.fredmiranda.com/forum/viewtopic_archives.php?TopicID=59775&page=0#491244

Apparently the 28-135IS and 28-105 are varifocal (non-parfocal).

Arjen.

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