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crescent
Ah-hah! Thank you very much. Now I see what timelord meant. That's stray light from beyond front of tube directly impacting the other side (primary side) of the inner aspect of the shiny metal focuser tube.
For tinkering enthusiasts and highly discriminating photon gourmets, I guess that's another place to apply mods to reduce contrast robbing stray light...but then I'm a glutton not a gourmet....wife says I should change my avatar to Light Pig, since I keep acquiring bigger and bigger dobs...
Thank you again for the effort to post that pic, I appreciate it.
Bryan Greer's sites and articles have never failed to educate me. He's quite good with explanations....an engineer with specialty in optics....and he posts his email on his site for people like us to ask him questions.
I've copied his mirror fan recommendations also used some of his flocking papers....very top quality gear, his stuff...
thanks
scott
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