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Fast Reflector collimation

Codecutter
in General
Hi Adam, I have a Quattro 150P which I have done many of Cuivy mods to but I am finding it very difficult to get good bright stars.
Do you have an explanation for the large bright rectangular and triangle artifacts around Alnitak.
I am using an Askar Duoband Filter and a Touptek 2600c ATR (Same as ASI 2600MCPro).
This is stretched png after WBPP NO DARKS, just FLATS and FLAT DARKS. 
It is 7 x 5 minute frames with camera ambient temperature. (29c)
I forgot to turn cooling on, my primary goal was to test collimation.
I have spent many hours trying to collimate this OTA and have used laser, cheshire and https://github.com/sajmons/CollimationCircles and a ASI 120mc with small wide angle camera in the eyepiece (a poor mans Ocal)
Are these artifacts related to collimation? I have a gap of 56mm between the Aplanatic corrector and sensor, it should be 55mm but my SVBony filter draw is 21mm.
This artifact is in the raw lights.
Any suggestions much appreciated.

Comments

  • BlockHeadBlockHead
    I do not believe this is a collimation issue. 
    I suspect there is diffraction caused by the "clips" or whatever the flat bits are in the out-of-focus image you show in your CollimationCircles. I am saying this is something to do with the tube/structure something and the light path. 

    See this example:

    Don't you agree that is the same thing basically? And this fellow reviewer says nothing about it. 
    My take away... seems like it is a feature. 
    This does not occur with the Takahashi Epsilon I use. 

    So... I think the first place to look is to determine what they flat bits are in the light path. 
    -the Blockhead
  • Codecutter
    Thanks for the feedback, could it be the focus tube protruding into the tube
    IMG_1518.JPG
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  • Codecutter
    The angles in the artifacts are around 120 which indicates mirror clips
  • Codecutter
    I 3d printed a mirror clip cover and artefacts gone.
    HorseFlamedfc.png
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  • BlockHeadBlockHead
    Nice!!!
    -the Blockhead
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