w7ay For a much better tilt measurement, use the one in KStars, which has arguably one of the best tilt measurement there is, and it is real time, too.
Oh, forgot another one... ASTAP, especially if you have a three-point tilt adjuster.
This is Siril's 4-point tilt display using my indoor tilt source (a jig that I had put together based on the Scheimpflug principle in optics whereby the source tilt itself can be accounted for):
From this, it is very difficult to determine which set of push-pull screw to adjust a three-point tilter (or even a 4-point tilter whose camera angle is not aligned with the sensor edges).
This is what ASTAP's 8-point tilt analysis gives when given the above image (which includes the Siril trapezoid lines :-), to show how the tilt trepezoids overlap -- you can just see the white lines from Siril):
Already, the 8 point tilt provides more information than Siril's trepezoid. But still difficult to determine how to adjust the push-pull screws of a 3-point tilter if the tilter screws are not aligned with the sensor's camera angle).
Now, when I asked ASTAP for a three point tilt (with the tilter's apex rotated relative to the sensor by +20ยบ), it becomes much more apparent how to adjust a three point tilter (albeit, the original FSQ-85 has been detilted already with a Baader M68 tilter):
What ASTAP lacks is KStar's capability of doing "real-time" analysis as the images are being captured, and requires an image to be saved to a file first. But, if you have a three point tilter (I suspect the Baader M54 tilter will sell like hotcakes when it is released, and it is 3-point), then ASTAP is a better tool IMHO, even though it take a few more clicks on the keyboard, and really does not tell you the direction (tighten or loosen) to adjust the tilt screws.
Chen
