I've got a really annoying extra diffraction spike in my images. I'm fairly new to all of this, but believe I've got good collimation. I've attached two images showing the spike, one of an astro photo in the M42 region, the other using an artificial star I made out of an LED flashlight. I've inspected the scope carefully and don't see anything obvious. The spider vanes appear to be straight, and at 90 degrees, not bent or twisted. Anybody have any experience with this sort of thing? The scope is an Orion F3.9 Astrograph. Thanks!