Quote:
Originally Posted by DJScotty
Hi Brent, the Ha filter is very clean. And it has in the past produced very good images...
Which takes me to Greg and Slawomir's suggestions.
The thing I don't get is that this is the same filter I used on the ED80, with beautiful results. I am screwing the filter into the same nose piece. The only difference is that the female end of the filter, when used on the ED80, would screw into the 0.85 focal reducer/corrector for the ED80. With the 10" newtonian, it is slipping into the focusing tube. So instead of being held in place by the thread, the nose piece is taking all the weight, being held by the compression clamp of the focusing tube...
I have to say, the Orion filter is notoriously difficult to screw in, whereas the Baader filters screw on quite easily. The physical differences between the Baader and the Orion filters are about a 1-1.5mm difference in diameter (with the Orion filter being bigger) but is still smaller than the nose piece diameter. So could it be the Orion filter is somehow pressing against the inside surface of the focusing tube causing the camera sensor to be unorthogonal (is that a word?!)
Thank you for your suggestions gentlemen. Appreciate your help...
|
Is the filter ring being compressed, distorting the filter itself by being a tight fit, possibly pinched and stressed ?
Anyway to just secure the filter in place without threading it on ? Even if it's not perfectly parallel it might at least prove or disprove the cause.