I'm a new Merrill owner. In fact, I won't even have them (DP1M and DP3M) until tomorrow. I have a short shooting session the day after I get them at the National Museum of the US Air Force. I think I'd like to take the Sigmas along and shoot some pictures after I finish with my project using the Fuji X Pro cameras and lenses. My question is this, I can use the Fuji cameras to asa's as high as 1600 and get acceptable results. I know that asa 400 is pretty close to the top end for acceptable color images with the Merrill cameras. My thought is to stick to a top asa of 200, use a tripod and go to whatever shutter speed I need. I'm in a very dark place (a very very large airplane hangar) and I'm going to need to shoot at f8-11. How are the results with these sensors at very long shutter speeds? I know I'm not going to get any reciprocity failure (ooh. I'm old!) but does the camera still work well with long exposures. I'm probably going to meter manually, possibly with a Sekonic L508 meter. Here's an example of the type of light I'm working with. Thanks for any pointers to get me started.