This probably differs from orthodoxy but I focus on a nearby bright star without focusing aids, then center the intended target. Full disclosure I'm using a C8 SCT on an AVX mount. The camera is an ASI174MC-Cool To get to the target I use Precise GoTo which takes me to a bright reference star. I center that star then reduce the format maybe 320x240 and zoom the image to fill the screen thus magnifying the star image. I lower the exposure to make the unfocused star just visible. Then focus the star to minimize the point size. After focusing I return the format to the desired size and send the scope to the target DSO.
When prepping the shot for DSO captures, is there a trick to getting them properly focused within the capture software? I'm using Sharpcap with my ASI224MC