Weird artifacts always appear on my image

LovelyNights

My seestar images always show square artifacts on the image. The attached image has been brightened to make it easier to recognize. What is causing this problem? Is the sensor defective? I'm deeply impressed with your opinions.

ZWO-Yao

We have received your feedback, please check if it is a reflection problem.

LovelyNights

ZWO-Yao
Thankyou for you reply.
How do I check the replection problem?
Please give me a guide for the check.

sensor

LovelyNights cover the scope lens or use the Dark filter. Take a shot and stretch it. If the banding is there, its not a reflection from the lens but the sensor.

LovelyNights

sensor
If the problem is caused by reflecting How can I fix it?
My master dark created for image enhancing looks doesn't have the banding.

sensor

LovelyNights you’ll have to craft a dew shield that will block the sources of light causing the banding. Literally a piece of black construction paper can work with some scotch tape.

LovelyNights

sensor
Thank you for your reply.

The problem is not noticeable for objects with sufficient brightness, but for objects with dim brightness, the problem seems to be highlighted by the strong application of autostretch. I bought, installed and tested a Dewshield, but it didn't have much effect.
In particular, when the effects of light pollution are evenly spread in the sky, they are more prominent.
I think it can be solved if flat frame is applicable, but I doubt that ZWO will upgrade to apply flat frame.

saguaro

One possible solution worth trying: the Astroflat plugin for PhotoShop:
https://www.prodigitalsoftware.com/AstroFlatPro1.html

Also, try using Seestar from an alternative location to see if the issue resolves itself. Also, the images you posted are all very short enhancement times. Try longer enhancement times and see if the effect diminishes.

LovelyNights

saguaro
Thank you for your reply
I tried relocating and shooting, but the results were consistent. All images, whether strongly noticeable or not, clearly exhibited variations in brightness for that specific shape. Perhaps the reflected light within the interior structure is affecting the sensor, possibly due to protective glass or reflective mirrors. Alternatively, the sensor itself may be faulty. I will conduct various experiments to address this issue because the process of exchanging the product is a cumbersome procedure for me.