Is my Sigma 530 Super DG faulty?

<p>Recently bought this and Lumiquest pocket bounce for my Canon 5D as "volunteered" to do photos for school childrens Ball. Don't use flash that much so couldn't justify 580 EX. Integration with camera functions seems OK (occasionally flash and camera have difference of opinion on ISO set), but it definitely doesn't auto zoom, which I thought it should. If I put a 24-105 on, it goes to 24 setting - zooming makes no difference. Now this is quite annoying because you have to remember, often in poor light, to check the zoom setting on the LCD panel. Is this a "fact" or a "fault"?</p>

<p>Many flashes don't automatically zoom if the head is tilted up. Maybe that's your problem?</p>

<p>I've no idea if the Sigma flash is supposed to zoom with a 5D or not. Some Sigma lenses sometimes have compatibility issues, so it wouldn't amaze me if some Sigma flashes did too.</p>