Quote:
Originally Posted by avandonk
I simply take a 30s exposure while jogging the mount by 30' every couple of seconds with a Bahtinov mask. The image below is the result. I can then tell which way to move by the diffraction patterns.
The top diffraction pattern tells me it is further back than the bottom diffraction patten. This means the bottom of the camera is further back than than the top so the camera needs to be adjusted down. These movements are typically fractions of a mm. I have a dial indicator for the lateral movement.
|
Ha! That's clever. Never thought about using a bathinov this way. I assume your field curvature across the sensor is nill then.