Many astrophotographers know the problem: after accurate focusing, in one or two corners the stars are not pinpoints. Often, the sharpness of the image is compromise to a level that the image has to be cropped.

Some possible causes of this problem are:

• a tilted camera sensor (fraction of a millimetre are enough)
• a tilted focuser
• a tilted focal plane of the telescope (common in Newtonian telescopes)
• tilted optical accessories by imprecise clamping

As solution, a tilter can re-establish the parallelism between elements and therefore the details on the corners of your photo will return sharp.

The best way is to calibrate it is using test images:

1. Identify the corner of your photo which has unsharp / aberrated stars.
2. Loosen the 3 pull screws (the smaller one).
3. Slightly turn the push screws in correspondence of for the corner of the photo that is unsharp.
4. Take a second image. If the sharpness has deteriorated, turn the adjustment screw in the other direction until all 4 corners of your photos has the same sharpness.
5. Tighten the pull screws.

Specifications