I am looking for some tips on how to achieve the best focus using manual methods. The best way I have found to do this so far is to get to approximate focus using a mask or other aid, then I measure the distance that my focuser is racked out with a micrometer. Then I take a series of short (5 - 10 second) exposures changing the focuser position in increments of 0.001" inside and outside of the initial focus point. Then I visually compare the images and pick the one that "looks" best, and reset the focuser to that position. Surely there has to be a better way. Are the super sharp and detailed images only possible with automatic focusing ? Here is an example of what I have been able to achieve using the manual method I have described above, but I still don't think it is optimum. FYI, This LRGB image was taken using a TeleVue NP101is with a ST2000XL camera. I recently purchased a STXL 16200 camera, but I have not yet been able to use it due to a number of reasons.