This is a good test to see if there is some restriction blocking the aperture. When this was discussed somewhere else, Roland Christen suggested this test:
With the diagonal in place and the telescope approximately focused to infinite, (focus it and then remove the eyepiece) look through a pin-hole and see if you can see the edge of the lens cell, if you can, then there is no restriction to the aperture and the baffles are fine where they are. If not, you can place a ruler/scale across the front of the scope and see how much of it you can actually see.
Using this method, I have determined that my 60mm scope is vignetted down to slightly less than 2 inches. Getting an exact measurement was difficult - this was done on a whim without much setup. But I definitely do not see the edge of the objective, I distinctly see the baffle ring.
So, now I am wondering, should I move the baffle to remove the vignette effect, or should I leave it alone? Given the cheap nature of this scope, the vignette is likely intentional to compensate for poor lens figuring in the outer edge of the objective.
Now I am questioning whether this little scope is worth the trouble of tweaking. I'm not sure whether I want to dissect it, relube the focuser, flatblack the inside, and flock key areas, if I am going through all of that trouble for a ~48mm scope.
I believe it was fellow CN member PCAD (Peter) who tested a similar scope and found it stopped down to 42mm. I think that is what mine is stopped down to.
Might explain why this scope tops out at just under 100x.
Clear dark skies...