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It has full travel in and out...that's the odd thing. Externally, it looks fine. I can only think that it's an internal issue of some sort. But - after I tightened the tension lock up on it nearly 2 weeks ago, the next time I used it, I was able to reach focus again. The inability to reach focus seems related to the slipping problem. Maybe I don't have enough tension on the focuser drawtube, hence it doesn't have enough strength to hold the camera in place. Remember, the camera is 1.5kg, so it's not light. But it doesn't seem much heavier than a CCD imaging unit, either, so that sort of makes me think that the focuser in this unit is faulty, or I simply have it too loose. I'm going to have another look at it on Saturday and test everything again.
Did you check out the ccd inspector images as well? I wonder if I'm reading them right - if so, the OTA either is badly miscolliimated, or the sensor on my DSLR isn't very good, or I haven't had the t adaptor squarely inserted into the focuser tube. Or, all of the above ;-)
Oh well, time for bed...
Thanks again.
Dave
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