|
Hello,
Here are a couple of screen prints of Fomalhaut using the Bahtinov Mask in conjunction with the Canon 40D “Remote Live View” utility, showing the standard view and the x10 zoom setting view. The best focus was very easy to obtain at the x10 zoom setting.
The star used in this example was Fomalhaut (1.2 mag) and the actual on screen view was slightly better than this screen copy. The two “stationary” shallow X bars and the central “moving” bar were easily visible on the Notebook.
Another good focus indicator is being able to view the pair of 3 distinct diffraction spots either side of the single central diffraction spot.
Also attached is the central, full size crop of a subsequent 5 second exposure of Fomalhaut with the Canon 40D after removing the Bahtinov Mask. Scope was Tak Mewlon 180 at 2160mm F12 prime focus. The 6 diffraction spikes are artefacts of the Mewlon’s 3 vane spider. Focusing life just doesn’t get much better than this!
Cheers
Dennis
|