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Edge Unfocused Moon - Collimation or....?

collimation
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#1 jawats

jawats

    Sputnik

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Posted 17 October 2019 - 05:35 PM

I have a B&L lightweight 800mm mirror - like this one: https://astromart.co...irror-lens-9712

 

It takes decent photos, but I think one edge of the mirror is out of focus when the rest is in. Does that indicate a need for collimation? I've attached a sample. 

 

If so, I've seen in other places how to open up to get to the adjustment screws, but how does one collimate a mirror lens like this?

 

Thanks for any advice!

Attached Thumbnails

  • Sample - Small.jpg



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