Zwo 071 calibration/debayer

[Ken82]

Ive recently started to try out my new zwo 071 and its clear the calibration/debayer should be different now to my previous canon 6d. 

I calibrated some lights with a master dark but even my master dark looks abnormal ?? Then i debayered the calibrated lights as normal using RGGB but i get a crazy green cast which wasn't present with my dslr. In my integrated image i also get what looks like scales in the picture when i stretch the histogram??? 

Clearly a lot to learn!

XISF Master dark      https://drive.google.com/file/d/1fu9aTnf5NL93h7EExG-p7jfEvVWNM8cV/view?usp=sharing

XISF Integrated image     https://drive.google.com/file/d/1YNAcDIIVO5k_laVoM8McPjpdbmdTFgB3/view?usp=sharing

Tif integrated image  https://drive.google.com/file/d/1KPz1cnoFdYVdaWEKioilikIh3j_N25JW/view?usp=sharing

Tif Master dark      https://drive.google.com/file/d/13qJafDTnJSMSpAQz8UqcdWe0RKlJdp9u/view?usp=sharing

Any help would be really appreciated.

Thanks 

ken 

Edited to include .tif files 

Edited September 15, 2019 by Ken82

[Dr_Ju_ju]

Mono \ Colour ?   & what software ? as I'm unable to view the files....

[alan potts]

Your not on you own Ken, I have had mine 3 weeks and I went back to my Canon, much more simple, I didn't get green anywhere though, with me my expectations were much higher for 3 minute exposure. Clearly I am not doing a lot right but I am equally not remotely impressed by this 071, am going to try again tonight.

Alan

[alan potts]

Julian, I believe a 071 is only colour.

Alan

[Dr_Ju_ju]

Ty Alan, but what format are the files ??

[Ken82]

 

It’s a zwo 071 mc so colour camera. Software is pixinsight 

https://drive.google.com/file/d/1fu9aTnf5NL93h7EExG-p7jfEvVWNM8cV/view?usp=drivesdk

master dark 

https://drive.google.com/file/d/1YNAcDIIVO5k_laVoM8McPjpdbmdTFgB3/view?usp=drivesdk

integrated image 

 

Alan I think it’s the user to be fair as this is all new to me. DSLR imaging was relatively simple and I hope this will be as easy once I know the basics. 

 

[alacant]

13 minutes ago, Dr_Ju_ju said:

what format are the files

They are pi internal.

37 minutes ago, Ken82 said:

help would be really appreciated

You may get more help posting in .tif

Cheers

Edited September 15, 2019 by alacant

[Ken82]

2 minutes ago, alacant said:

They are pi internal.

You may get more help posting in .tif

Cheers

Yea thanks I’ll sort that when I’m home later . 

[Ken82]

Ok files updated with .tif so i hope that helps some people give me feedback.

master dark  https://drive.google.com/file/d/13qJafDTnJSMSpAQz8UqcdWe0RKlJdp9u/view?usp=sharing

integrated image    https://drive.google.com/file/d/1KPz1cnoFdYVdaWEKioilikIh3j_N25JW/view?usp=sharing

thanks ken

[Ken82]

I got some feedback from the pixinsight forum and it appears i need to use photometric colour calibration to get rid of the green cast (odd that it doesnt do this with a canon 6d as its the same RGGB). 

Not sure yet on the strange pattern/scales on the picture, so hoping for some help with that one. Also my master dark is abnormal? 

[Miguelo65]

Hi all,

Ken82..Try a simple colour balance decreasing green channel with Pixinsight histogram, PS or any other

Regards

[Ken82]

4 minutes ago, Miguelo65 said:

Hi all,

Ken82..Try a simple colour balance decreasing green channel with Pixinsight histogram, PS or any other

Regards

Thanks miguelo65 

i was able to do similar with a colour balance, just thought it was odd that it’s effectively the same as my canon 6d RGGB. Anyway happy with that. 

What do you make of the scales effect to the centre right of picture ? It becomes more apparent when you stretch the histogram. 

[Miguelo65]

• Not sure what you mean Ken. Just applied a quick DDP with Maxim to the image and color balance. Anyway, as you strech image more visible vignetting is. Since no flat field was in it, i´ve use an Auto Flatten Background filter with Maxim and seems works fine on bright objects.

          Regards

[Ken82]

Ive highlighted the scaly area, what do you think? Its a lot more obvious on the higher resolution images.

[Ken82]

On 15/09/2019 at 21:31, Ken82 said:

Ive highlighted the scaly area, what do you think? Its a lot more obvious on the higher resolution images.

Does anyone know what this pattern in the picture is ? Am I cooling too low for example ??(-15) 

[Ken82]

This is my image after colour calibration in pixinsight which is similar to miguelo65 with a strange pattern to the bottom right hand side-

https://drive.google.com/file/d/1lOXBJGj8RkplLrnfKdRkZehLdSmJ6mwe/view?usp=sharing

And then after automatic background extraction showing an even greater gradient/pattern-

https://drive.google.com/file/d/1JzYHqkPHPDcRxwRmE5kvJPa2MFsgUr7c/view?usp=sharing

 

What is going wrong ?

Edited September 17, 2019 by Ken82

[Ken82]

I contacted zwo and they have said it is dew so I’ll need to replace the desiccant already :( 

[DaveS]

Yes, I was about to say, I've seen that ring pattern before with my SX Trius CCD when I got dew forming on the inside of the camera window.

[Ken82]

I’ve got some new desiccant tabs on the way which will solve the issue. A bit disappointed this has happened so quickly as the camera has been in its original packaging throughout the summer.

Also noted the camera doesn’t have an external desiccant tube as I was lead to believe from description. The instructions zwo have sent me for replacing the desiccant requires removing the front of the camera and exposing the sensor etc. Not an issue I guess but not ideal.