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I concur with Bojan, it just looks over exposed...
Try experimenting with exposure times (ie: shorter) with the current gain setting you are using or, alternatively, reduce the gain setting...
Keep shooting with different settings until you achieve the results you are looking for, to be honest, it's pretty much how we all get started & results in as getting to know our camera settings in such a way as to be able to apply them according to what the target is...
As Bojan has indicated, settings will vary depending on what you want to shoot... Lunar, big bright planets will require shorter exposures or lower gain settings to something in Deep Space which is significantly dimmer.
Assuming in your picture you have used a bright star, so a reduction in either exposure time or gain settings should yield better results...
You will however, experience some 'blobbyness' of stars when shooting with an SCT, even with a focal reducer...
An example is attached... M42 taken through the 8"SCT I used to own...
Sorry, there are no magic number settings to give you, just the advice to play around with the settings til you achieve the result you are looking for & then accumulate that experience & knowledge & apply it to other targets in an iterative way...
Cheers
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