The focus on my Bintel 6” f6 newt was just enough with my Canon 600D except I wanted more play in and out with focus so the guys at Bintel fitted 3 x 4mm thick cork spacer pads to the underside of the primary mirror and that gave me an extra half a turn in or out which was perfect ( no charge )
I bought mine for $299 about 3 years ago and they are still $299 today ( I chose GSO Bintel in lieu of the Skywatcher 6” f5 not because of price but because I prefer the GSO Bintel focusers to the Skywatcher focusers - better design and quality barrel and thumb screws )
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