Mike Gammill , Aug 10, 2008; 08:40 p.m.
The X-9 is more closely releated to the X-370 than to the X-570. This issue isn't quality, but features. Unlike the 570, the X-9 does not have TTL flash metering so you need X-series rather than PX-series flashes. A few other differences: The X-9 has a diagonal split focusing aid rather than horizontal. The touch switch of the 370/570 is replaced with a pressure sensitive switch. The X-570 is more advanced because of its flash metering, but since it is older than the X-9 it might be more likely to develop electronic problems. Like most electronic cameras, the capacitors have a limited lifespan. Old age is a predator that stalks capacitors and it is silently closing in on each and every one of them to make the kill. Fortunately, the capacitors can be replaced, but often as not, it's cheaper just to replace the camera.