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I have the same problem with my 10inch F5 reflector, I can not achieve focus using the prime focus method, not enough inward focus travel.
To fix this:
1. Move the mirror up the tube, requires the drilling of new holes to hold the mirror cell - messy.
2. Buy a low profile focuser, this my help depending on how far IN the focal plan is.
3. Shoot using the afocal method as others have suggested, hold the camera with lens up to the eyepiece.
4. Shoot using the eyepiece projection method, attach the SLR camera body (with no lens) directly onto the eyepiece. Only some eyepieces have a thread on top to enable this. An adapter is also required in addition to a T-ring. I use this method to bring my SLR to focus. I use Baader Hyperion and Pentax XW eyepieces for this.
Hope this helps.
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