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Messages - Rod771

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16
General / Re: Batch processing help DSLR
« on: 2013 July 25 00:51:24 »
Hi Rob

Yes the histogram graphs are in linear mode

I did take some flats with shorter exposures, here's a shot of one at 1-80 sec. Linear mode.


17
General / Re: Batch processing help DSLR
« on: 2013 July 24 06:02:38 »
I've taken 20 new flats using a pink screen instead of white, to bump the data in the red channel. It has help but I'm still not sure if they're right. The focus should be good as I set up again and slewed to the Helix and focused with BYE (didn't get many new light frames as the clouds were coming in but I just wanted to match focus anyway.)

I have created a master bias consisting of 150 frames and the master dark frame consists of 30 ninety second frames taken with the camera in the fridge to help match the temp to the lights.

I've run the lot through BP again and I'm still "sinking".

I also tried creating a calibrated master flat outside BP following the PI tutorial but that didn't work when stacked with the light frames. The image had red vignetted edges which i couldn't get rid of?

So for now I've been using BP with the master bias , master Dark , individual flats and lights and letting it do its thing.

Below are some shot of the flat statistic and two shots of the image after integration. The image on the right is after integration with the background neutralization applied. The one on the left is after ABE and an Auto stretch with STF. What I'm I doing wrong??? Are the flats still under exposed?

Cheers

Rod




18
General / Re: Batch processing help DSLR
« on: 2013 July 15 23:48:04 »
Yes it is DPP , well spotted Rob!

Here is the linear flat histogram.

I will definitely re do the flats 

Cheers Rod

19
General / Re: Batch processing help DSLR
« on: 2013 July 15 05:24:23 »
I'm limited to about 90 sec at the moment as I don't have any guiding gear yet.

There is very little red channel data in the flats, so i will do them again with your suggestions.

Here are the histograms for the 60 sec and 90 sec lights and one of the flat frames

Thanks for your help  :)

20
General / Re: Batch processing help DSLR
« on: 2013 July 14 17:23:45 »
Appreciate your help , Rob  :)

Looks like I will have to shoot some new flats applying your suggestions. My flats were metered by the camera and will be under exposed.

I agree on the darks, I usually take darks on the same night as my lights but in this case I simply forgot.

The F/ratio of the system is F2.1 and the exposures of the lights are  60 and 90 second subs all @ ISO 800 (see the above BP attachment)

Here is what the image looks like with just the un-calibrated lights stacked and processed. You can see some slight light artifact to the left which is what I'm hoping to clean up.

Cheers  Rod

21
General / Re: Batch processing help DSLR
« on: 2013 July 14 00:20:21 »
Hi pfile

The temps were different and I was concerned about this , but the Pixinsight tutorial said not to worry about matching the temps as it rescales the dark to match the lights. I have run the whole batch processing script again , without darks , just bias and flats but have ended up with same result???

Im out at the moment and will try different pixel rejection setting when I got home, Thanks.

Could it be my flats? I've found these the hardest to acquire. As I use the hyperstar lens and the camera is hanging of the front of the OTA, i cant do white t-shirt flats and I stuff up sky flats all the time. My flats are taken by plugging the laptop into the LCD TV , displaying a blank full screen document (so white screen) and pointing the scope at the TV with the CLS-CCD filter in. I wonder if my method is good enough?

Thanks Rod

22
General / Batch processing help DSLR
« on: 2013 July 13 05:51:27 »
HI all

Complete newbie here.

I've found and run the batch processing script for the first time and have an ugly result.

I have used Pixinsight for a couple of images before which have turned out good. However for these images I only registered and integrated as un-calibrated  DSLR raw images.

Now with a new target (Helix) I wanted to apply some flats, darks, bias frames to get some better results. I watched Harry's batch processing video and tried out the script.

I dont know what I've done. After applying Bais x15,  Darks x 15 (same ISO same exposure length as lights ,different temp) and Flats x 10 (ISO 800) and debayering I end up with this image below.

Lights were not dithered could that be it?

Camera is the 60Da with clip CLS - CCD filter,  I used RGGB as the debayer option. I have done a stack of reading and searched forums only to have ended up with "information over" and my brain has crashed.

Thanks for help

Cheers Rod :)

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