Some tests with the ASI174MM.
Comparison with a Lumenera Lt225.
Contrast stretched center of a flat-field of the Lt225. The vertical and horizontal lines are clearly visible. Variation from 3.2 to 3.45 .
Contrast stretched center of a flat-field of the ASI174. Some horizontal pattern is visible. The cloudiness of the field is due to a not-so-uniform illumination. Variation from 12.5 to 12.9 , seems significantly smaller.
Two flats were captured, one with 7ms, the other with 25ms. Then one flat was divided by the other. This should have removed all the stripes, but some remain, though of reduced amplitude. This is a real problem as it complicates the image processing to get a clean image.
Two flats were captured, one with 7ms, the other with 25ms. Then one flat was divided by the other. All the stripes are gone, THIS IS AVERY GOOD SIGN! The remaining cloudiness is due to non-uniform illumination.
More tests to follow with a better diffusor and a real target.