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Old 23-04-2013, 08:45 AM
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niko
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DSLR and x4 powermate - not coming to focus

So, finally took the plunge and got an EQ6 for the 8" newt I bought off a member here - which has had the primary mirror moved up the tube. Set it all up on the weekend for a test run.

I managed to get the DSLR in focus with a x2 barlow (2") but couldn't find focus with the x5 powermate.

For x2 I had camera, t-ring, short ext barrel, barlow and longer extension tube

Trying the x5 I unscrewed the bottom of the powermate and went straight from t-ring to it and then various combinations of extension tubes without any luck.

Any thoughts?

cheers

niko
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Old 23-04-2013, 12:26 PM
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Merlin66 (Ken)
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Hmmmm
Sounds a bit strange...
I use my powermates with the T thread adaptors ( the 1.25" section unscrews...) this brings the camera/ CCD very close to the rear of the body.
As the focus is (almost) independent of the back focus I can only assume you're not getting the front lens far enough into the light path??
Does the DSLR body focus at prime focus OK? How much "spare" travel does it allow?
Can you focus any of them with a low powered eyepiece?
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Old 23-04-2013, 12:58 PM
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naskies (Dave)
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Perhaps you need more "out" focus - my 5x PowerMate usually sits at a similar focus distance as my eyepieces, i.e. about 5 cm further out than prime focus position without the PowerMate. Do you have a 2" diagonal that you could use as an extension tube?
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Old 23-04-2013, 04:20 PM
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niko
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thanks guys

I have a short and a long extension tube - maybe I just haven't got it all in the right combination

I suspect I need some daylight and a distant object to muck around and get it right.

cheers

niko
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