Thanks Raki. I'll email Ashley about it and see what he's got. So the adapter has a plate that covers a larger part of the filter wheel face?
I increased the shim thickness from .27mm to .34mm and it seemed to make a difference. Not 100% perfect but probably not worth chasing any further.I'll wait til I finish the current imaging project (I consider it operational and ready for imaging and have been) I may experiment with a few different thicknesses. Perhaps a tad thicker than even this.
I'll also be imaging with smaller sensors at times so it won't be an issue with them.
Greg.
Quote:
Originally Posted by niharika
If you ask Ashley of preciseparts he will know about it as he already made a few including mine. He may initially complain that its a bit risky and stuff but i think its quite ok. This way the whole body of the Moag is supporting the weight and pressure is spread out on a larger area compared of having a adapter sticking out in between.
But if the tilt is constant on different part and orientation it might well be coming from somewhere else.
This is overall an interesting area. For example when I got my 3nm filters from Astrodon I saw that their edges were blackened with paint. My initialy thought was would they still sit "Perfectly square"? I don't know and thankfully I don't have a f 3.8  scope. Overall I don't think its coming from Scope or the CCD itself. So it can be from anything else in the imaging train and it can be hard/expensive to figure out what exactly is causing it. I believe Peter Ward once posted something on how he could measure required shimming thickness based on some calculation derived from auto focusing. I know he uses quite high end component like you so does that indicate tilt is unavoidable time to time when you have few items sitting in between? One thing for sure once you start getting perfect stars in all corners you would be reluctant to touch it. |