Canon 5D Mark II Thumbnail Index/Reduce button not working

[brittany_r._dunks]

<p>Hello,<br>

Today my "index/reduce" button has stopped functioning. This is the magnifying glass button on the back, upper right on the camera, which allows me to review images faster by allowing up to 9 show on the screen at a time. When I am looking at an image and push the button it just shuts off/turns black, until it is opened again.<br>

What is also strange is when reviewing an image, I can zoom in fully, but when I attempt to zoom out, with the "index/reduce magnifying" button, it will also shut off.<br>

ANY ideas? Firmware is up to date, nothing strange has happened to the camera lately. Just out of nowhere. <br>

thank you</p>

[brittany_r._dunks]

<p>nevermind... I figured it out! I recently changed my custom functions to allow back button focusing, when I just changed them back to default, it worked again! </p>

<p> </p>

[smooth_carrots]

<p>I use back button focusing and my "index/reduce" button works fine. I think you need to check your settings.</p>

[brittany_r._dunks]

<p>just followed the back button directions from here: <a href="http://melissajill.com/blog.cfm?postID=690&f-a-q-back-button-focusing">http://melissajill.com/blog.cfm?postID=690&f-a-q-back-button-focusing</a><br>

and didn't mess with it much. just turned them back off and working fine...</p>

[robin_sibson1]

<p>If you set back-button focusing on the * button, then the AF-ON button serves as the index/reduce button (manual, p. 182).</p>

[brittany_r._dunks]

<p>ahh, thanks. I hate reading manuals, maybe I should memorize them cover to cover. :)</p>