Does the 2X (or the 1.4X, for that matter) maintian the functions of the lens stabilization (IS), or do you lose that when you put a converter on?

Thanks!

-- Jerry Hogan (jhog@ti.com), May 04, 2001

Answers

IS is maintained.

-- Jim Strutz (jimstrutz@juno.com), May 04, 2001.

Except on the EOS 5 and older models where the maximum aperture of the lens + TC combination is smaller than f5.6. In this older models power to auto focus and IS is cut off beyond f5.6 (e.g. 300 f4L + 2.0x TC on the EOS 5, the IS does not function). On all other current models the IS will work regardless of the combined aperture.

-- Nico Smit (smit@landbou.uovs.ac.za), May 05, 2001.

How to avoid the f5.6 IS limit on older EOS bodies

From: "Hubert Wachter" To: "eos@avocado.pc.Helsinki.fi" Date sent: Mon, 17 May 1999 20:48:55 +0100 I found this thread on another site, try it if you dare!

"So when you put at 2x on your EF300/4L (IS) you'll get a 600/8 lens that will not AF with EOS bodies except the EOS 3 because the effective aperture will be slower than 5.6. Unfortunately with elder bodies (pre '94 / before the EOS 1n I think) you'll also loose IS when loosing AF. Now remember those 3 extra pins/contacts the 300/4L and the 2x have? Cut some adhesive tape and tape the contacts on the lens over. Mount the 2x and voila: You are now using a 600/8 IS lens! You'll not loose AF (you lost that already, remember?) but your camera will think there is no extender and act as if there was a normal 300/4L IS attached to it and will promply operate IS (it will even try to AF if you set it to AF but my EOS5 failed completely to do it).

Sole disadvantages: The correct max aperture of the lens is unknow to the camera. It's electronics will do all calculations on a basis of a 300/4 lens. However this is not critical. Neither is the metering affected by this trick."

-- John Rochester (rochester@homeshef.freeserve.co.uk), May 05, 2001.