Probably Olympus OM-D E-M1 (£295 second hand)or OM-D E-M5 MK II Body Black (£419 new). With the 60mm lens. My shooting is due to commitments not ideal, i.e. I don't get up early and look for insects whilst they are still asleep. It is more 5 minutes here or there when my family let me, never early in the morning and on holiday often by torch light. I currently use Canon 550D and 60 mm lens which I am happy with but I would like the ability to do more stacks. If Olympus didn't have this feature I wouldn't think about changing for a second. Any thoughts? Why do Olympus users think?