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This is a trap many newbies fall into. The Bintel 6" f/6 [like many Newtonians] is optimised for visual work, meaning that it has barely sufficient, or even
insufficient back focus for mounting a camera. As yours is marginal, you are lucky that you can raise the primary mirror up the tube enough [say 5-6mm] by screwing the collimation screws a bit further in.{use longer screws if necessary]. This will allow you to rack backwards and forwards
through focus in order to get precise focus. You will, of course, have to
recollimate the scope after moving the mirror up the tube. If you turn each screw the same amount, the collimation should not be disrupted too much.
raymo
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