Stop leaving resolution on the table.
Get the Z'Tilter and see what your optics can really do.
The harsh truth:
Every component of the imaging train has a small manufacturing tolerance.
In optics, errors don’t just add up — they compound.
On its own, each part can be perfectly “within spec.” But stack them together, and those microscopic misalignments accumulate.
That’s why you can end up with stars that look sharp in the center (or on one side) of the sensor, but softer or distorted elsewhere. Your sensor plane and optical plane aren’t perfectly aligned by default — and if your backfocus is even slightly off, the problem gets even worse.
The bad news: you usually can’t fix this by swapping out a single “suspect”.
The good news: there’s now an easy way to correct tilt and dial in backfocus.
Check Your Images For Tilt
You can use N.I.N.A. (Hocus Focus Plugin), Siril, or ASTAP to check your images for tilt. Below are real-life examples of tilt measurements.
Once you know how much tilt is in your images, you are ready to remove it using a Z'Tilter by OGMA.
Remove Tilt for Perfect Images
The Z’Tilter is the 'missing piece' that ties your entire imaging train together by correcting the sum of all micro-misalignments so your optics finally perform to their full potential.
Now you can eliminate the aggregated sensor tilt and backfocus errors with a few simple twists from the back of the camera.
Your Goal
Stars perfectly focused across the entire frame
Below is a screenshot of a measurement taken after adjusting tilt using a Z'Tilter:
And this is what the user had to say:
"I had made hundreds of attempts to eliminate the tilt with [a premium tilt solution from another brand] to no avail. I achieved the above results with the Z'Tilter in just five adjustments." - Feedback by: DavesViews.
You can follow this customer's work on Astrobin.
The Z’Tilter has been designed in the USA by astrophotographers for astrophotographers who prioritize mechanical stiffness and repeatability once tilt is corrected.
A single unit can be configured for either 3-point or 4-point tilt adjustment, depending on user preference.
The Z'Tilter is compatible with all ZWO ASI2600 and ASI6200 cameras. Other ZWO camera models with the same body diameter may be compatible with this product.