Sorry guys.
Just wanna make one point clear. When I said I don't understand the positive/negative projection thing, that wasn't a slight on you in any way Paul. Just meant I don't understand how it works.
More research for moi
Now, here's a question. I understand the perils of collimating a SCT with a diagonal in place if I'm not going to use a diag when I'm imaging.
But when I have been collimating my scope I've been doing so by eye with the ep straight in the visual back. No barlow ... no Powermate.
But when I image, I use a powermate.
Sooooooo ... could that be contributing to any type of collimation error????
Should I be collimating with the barlow or powermate in place, if that's the optical train I'm using when I capture???
Or does that not present the same mis-collimation issue as a diagonal??? the