Pardon my ignorance, i need to ask all gurus, how tight should a screw-mount lens be screwed on? Unlike the m mount i know for sure the correct 'Lens-body' is aligned when clicked. i am very tempted to screw harder (pardon my vocab), but i will not be sure if it is aligned perfectly right? a master told me just make sure there is no gap between lens to adapter, or lens to body, that makes sense too, just wanna hear others' view, thanks so much for yr help!