Stu, you are right on the limit before Flexure becomes a major problem.
HEQ5 - Max: 8" f5 - f6 Reflector
EQ6 - Max: 10" f5 Reflector
As for Astrophotoraphy you will need to attach your camera and see if you get enough 'IN' travel to get focus.
If you don't you will need to either:
- get a low profile focuser
or
- move the mirror up the OTA
or
- both
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