I have a few Minolta and Nikon cameras/lenses. I do about as much shooting at night and in low light as I do in daylight. Most recently I've been shooting with wide-normal to wide lenses. I have a Minolta SRT-101 that's used almost exclusively for night and low light shooting. I make liberal use of the MLU feature. I also have an FM that pre-fires the mirror when the self-timer is engaged. Both of these cameras produce much better results when MLU/prefire is engaged before using slower shutter speeds (1/30 to 2 sec). I also have an XD, and despite its reputation for excellent dampening, I find that the results I get from it at similar shutter speeds are noticeably softer. In total, these experiences have led me to greatly favor a method of operation which incorporates the capability for complete mirror flip-up at least two seconds prior to shutter release. I've been combing though lots of information online, and I think I have a pretty good handle on which cameras have MLU. By and large, cameras with MLU are older, less automated, and heavier (like my SRT). The few exceptions to this generalization (like the Pentax LX) are rarer, and definitely more expensive. So I'm broadening my search to include mirror prefire. I have concerns about vibration caused by self-timer gearing, but I've generally found the FM's to not have as adverse an effect as simultaneous mirror/shutter fire. A good tripod helps eliminate vibration from the timer, I think. But this seems to be a less well-documented feature. So I'm asking APUG: which cameras do you know have a mirror prefire feature similar to the FM's? Right now, I understand that the two-digit OM's (10, 20, etc.) have it. I also read that the Pentax MX has it, but I'm not sure if that's right. For a multitude of reasons that I won't go into here, I'm not really fully engaged by either the Nikon or Minolta systems. I'm probably most interested in m42 cameras, but really, I'm open to anything. I know what's out there in the Nikon system. My secret hope is that there is a newer Minolta SR(MD, MC)-mount model with prefire, but right now I don't think any of them have it.