Cardboard Edge Mask for my 12”...

[Captain Scarlet]

... to try to mitigate or test for Turned Edge on my newt...

[DaveL59]

the cat seems pretty amused by your efforts  

[Captain Scarlet]

23 minutes ago, DaveL59 said:

the cat seems pretty amused by your efforts  

Yes the three of them pretty much dictate the rhythm round here!

[DaveL59]

 I've only 2 but know what you mean, my tabby loves the hammock on the tower too lol

[markse68]

I did similar a while back Magnus. Taken it off again now but it may go back on or a thinner one if the star tests don’t improve. Then again the other night it was performing great on tight doubles even with a less than perfect star test lol 🤷‍♂️

Edited May 19, 2020 by markse68

[Captain Scarlet]

Yes in fact it's your fault

Your comment on your "what a night" report caused me to go back to Suiter's book and re-read the turned edge section. My mirror and view seems to tick all the boxes: markedly different in- and out-focus diffraction rings; tight diffuse glow around bright objects, especially noticeable at high magnification; and (I think I recall this, though I need to re-test it) residual softness still detectable a long way defocused one side vs the other. I'll start off by simply putting the mask over the top of the spider so I can place it, remove it repeat while always looking through the eyepiece.

[markse68]

It’s so tricky to know though- has the mirror perfectly stabilised? Following to hear your results. Oh and sorry 😂