Hi there, I'm Thomas from Darmstadt, Germany. I got me an old x-a1 because of the good reviews concerning sensor noise. I recently tried to use it for astrophotography and was facing two major problems. 1. the ISO setting did not affect the picture on the display, means I could not see stars at all and could consequently not do focusing with Bahtinov mask. My Sony Nex-3N even allows a 'live view' (when saving in jpg format) to zoom in on the stars while doing the focusing. Stars (and noise) become brighter at higher ISO values as expected, why not so on th Fuji? 2. I solved this problem by taking many pictures, zooming in on the saved images, but the camera seems to have a maximum zoom factor for saved images which is not very high. So even in this quite cumbersome way I could not see sufficiently big Bahtinov patterns.
Since I have the camera only since few weeks it is absolutely not excluded that the mistake is on my side (yes, I read the manual). If not, I would say it is definitely not usable for astrophotography.
