I'm testing a new RC8 and when it comes to scopes with vanes, I'm used to seeing prominent diffraction spikes with small stars. It feels like I'm getting the opposite here.
Is it the focal length (1625mm), or due to the secondary central obstruction? Bad seeing?
The scope was collimated with a howie glatter laser, and a defocused star looks good.
Any suggestions? (not that I can do much about it with the current weather).
Higher quality image here