[Tannehill]

That straight edge on the full-in focus pic is the focuser drawtube encroaching into the light path. The fact that it's absent in the full-out pic cinches that, I think. That's normal, most newts look the same.

The last two photos are with the Chesire in the focuser tube, or just the appearance thru the focuser with nothing in the drawtube? I can’t see the typical concentric rings I’m used to seeing in a Chesire….just wanted to clarify this, because the last two photos look like simple shots thru an empty drawtube; we see the secondary mirror (no spider, as you say, in a Mak-Newt). Is your primary mirror marked with a donut? Could be the pics are just a bit dark to see all these things….

Can you see the back of the laser’s Barlow attachment thru the meniscus? Or are you just using the primary (without Barlow attachment) laser beam of the collimator to align the secondary, then using the chesire to align the primary? Or using the laser with-then-without Barlow attachment to do both, then checking it with the chesire?

As to that apparent eccentrically located center spot…It seems more like the upper right edge of the image is fuzzy, rather than eccentrically located…this raises the vignetting issue. At least that’s what your last photos suggest. And this fuzzy edge feature is MORE dramatic in the last pic, the full focuser-out version, and covers more than 180 degrees of the edge. Changes in the appearance of things as you rack your focuser in and out are almost always either focuser squaring problems or vignetting of the light cone somewhere along the way.

When you look thru the empty focuser tube in the full-in and full-out positions, centering your eye over the focuser tube as best you can, are you able to see the full circumference of your primary mirror both times? Can you see the full circumference of the secondary mirror itself, also?

S

Originally Posted by DJVege

Ok! Here are the pics!!

The first 3 are of the focusser!

The fourth is of the cheshire in the focuser.

The fifth is of the laser collimator in the focuser.

The sixth is what I can see through the cheshire at full IN focus (put the digital camera flush on the 1.25" adaptor).

Seventh is what I can see through the cheshire at full OUT focus.

What do you think? Maybe the secondary needs to move away from the primary a bit?? (In that direction...???)

Oh, when I collimated, I did so at full IN focus.