Quote:
Originally Posted by alpal
That looks like field rotation from the guide star being too far
from the main frame & the drift alignmment out - strange?
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Doubt it's field rotation as I see the same effect in my 10 second test shot I did while making sure the scope was pointed in the right patch of sky.
Quote:
Originally Posted by Ross G
Nice photo Chris.
Great detail.
Ross.
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Thanks Ross.
Quote:
Originally Posted by David Fitz-Henr
I have found that field flatteners are quite sensitive to the separation between the imaging chip and camera. It does not appear to be field rotation as the off-centre stars are most definitely out of focus compared to the central region. If possible do some tests with varying distances between the flattener and the camera. Here is a link to my pbase site showing some tests that I did with a Newtonian / Paracorr showing significant improvement when the optimal separation is determined: http://www.pbase.com/david_fitz_henry/image/124811410 |
Interesting. I'll see if I can rig up something to let me adjust the spacing from the camera to the scope. At the moment I have only a fixed adapter for the Celestron C8 which is designed for use without a field flattener. Mind you even without it I still get a similar image. Think it's time for a trip to the hardware store.
