William Optics 132 tests

Aerial about 300 yards distant. Stack of best 14 out of 30.





St Johns church. 2000 feet distant. Best 20 from 50 images in fading light.




Arcturus out of focus. Nice round rings showing optics are not pinched in the cell.




13 second exposure of Arcturus. The image shows a much enlarged copy of some stars at the end of each arrow.
Stars away from the centre are elongated, showing that a field flattener is needed for astrophotography.




Stack of best 8 images of Deneb. 30 seconds exposures with no guiding and very rough and ready polar alignment.
Need for field flattener quite obvious at the corners.




Negative of above image




Stretched to show degree of vignetting. The camera was a Canon 350D with a 1 1/4" adapter which probably contributed most of the vignetting.

Bahtinov image on Deneb
A good test for colour correction. The red, green and blue blobs that make up each spike should not deviate significantly from a straight line.