1.4 extender with the 100 - 400 L

[gramps]

Does anyone have much experience using the 1.4 hooked to the 100 - 400? how good is the combo? any pics?

[xc611]

No AF, picture is good.
http://ns.biomessenger.com:8081/photo/junk/moon/001.jpg

[gramps]

wow, that surprises me, I thought it may be the other way around. The 100 - 400 is on the 1.4 's list of lenses that it will work with but I don't remember seeing anything about the AF not working.


I just reread about it...............AF on lenses that are f4 and faster!!!!!!!!

[phili1]

Gramps depending on your Camra it will work ar 100 but not after that. My 20D will auto focus at F6.3 but can not above that.

[kiwimichael]

No AF, picture is good.


Hi I understand that it is possible to trick the camera by taping some of the contacts on the extender. See http://photography-on-the.net/forum/showthread.php?t=25345. I'm not sure how good this is and what problems it may cause (e.g. burning out the USM motor).

Cheer
Michael

[phili1]

All I can say is you are talking about $3000 worth of equiptment, and I know I would not take a chance. What if the tape breaks off and gets in to the camera.

Besides the 100 to 400 has a allot of pull and anything that far off, your at infinity so focus is minimal and if its a head shot, to get it it has to be standin still to get head shots unless your that good an caan get them flying, I know I can't.

[CyberDyneSystems]

I have used this combo on the MkII (which offers full AF ) and it is not bad at all. You do lose a lot of light and the image quality degradation is noticeable.. but in most cases it is acceptable.

On a day when there is a lot of availbale light.. it works quite well.

As mentioned allready.. if you don't have a "1" .. then you won't have AF.

[Theo]

My First Shoot with the Drebel + 100-400L + 1.4TCII @f8.0 - 400ISO and 1\500th to 2 Seconds!

http://community.webshots.com/album/207504289xPHpyW

Ted