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ZWO ASI 294 MC PRO gradient/misalignment issue


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hello,

I have been imaging the California nebula and found that there was a large gradient in the final image. I have now taken some flat frames for the setup and found that the gradient was in all of the photos and took up about 1/3 of the sensor space. 
 

I have attached an image of a flat frame to show the issue. 
 

I am currently using a skywatcher esprit 100ed with my ASI 294 MC PRO. Between the two of them are, field flattened, ZWO OAG, 2 spacers and ontology l-enhance filter. I have checked down the objective and can see no issues with the alignment up to the filter. All threads are screwed in correctly with a snug fit, and there are no massive pieces of debris covering the objective.

need help ASAP please.

cheers,

george

011BE8C1-954F-419F-8BE9-C5655615B151.png

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8 minutes ago, GHOSTGOJ said:

hello,

I have been imaging the California nebula and found that there was a large gradient in the final image. I have now taken some flat frames for the setup and found that the gradient was in all of the photos and took up about 1/3 of the sensor space. 
 

I have attached an image of a flat frame to show the issue. 
 

I am currently using a skywatcher esprit 100ed with my ASI 294 MC PRO. Between the two of them are, field flattened, ZWO OAG, 2 spacers and ontology l-enhance filter. I have checked down the objective and can see no issues with the alignment up to the filter. All threads are screwed in correctly with a snug fit, and there are no massive pieces of debris covering the objective.

need help ASAP please.

cheers,

george

011BE8C1-954F-419F-8BE9-C5655615B151.png

Looks pretty much like my flats with ZWOASI2600MC and Optolong LeNhance filter, mine are purple on one edge and green on the other.

Dave

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11 minutes ago, Davey-T said:

Looks pretty much like my flats with ZWOASI2600MC and Optolong LeNhance filter, mine are purple on one edge and green on the other.

Dave

Is is just something that you just deal with or have found ways of fixing it?

George

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5 minutes ago, GHOSTGOJ said:

Is is just something that you just deal with or have found ways of fixing it?

George

Only just started using it myself, flats seemed to work ok but only managed this rough and ready Rosette so far, about a dozen 300sec's

Dave

Rosette-nebula.thumb.png.3eadaba82dc1649ce8e4d77aa523b69c.png

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4 hours ago, Davey-T said:

Flats look a bit weird on screen when taking them but look ok colour converted.

Dave

ASIAIR-Flat.png.00af5ad07e8a0f1fb92df8f07396f9d8.png

That puts my mind at ease👍, it’s interesting how it can look every questionable straight out of the camera and then normal once processed a bit 

cheers for the help

george

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