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Message: <blockquote data-quote="BF Hammer" data-source="post: 810428" data-attributes="member: 48483">Hard stop or no stop, it should not really make a difference in dialing in to infinity focus.I cannot determine which version 70-300mm AF-P you have. There are 3 different versions listed at imaging-resource.com. I used to have one, it was a full-frame version. I was not impressed with it's optical qualities. Is it possible you are seeing a typical unsharp image for a lens that struggles in fine detail? The usual way to focus for astrophotography is to use LiveView and use the screen zoom to enlarge a star as much as you can, then adjust the focus ring until you make the star as small as possible. That will be infinity focus, but it does not assure that the lens can make that star sharp.</blockquote>