Activity

Thank you Vincent, you’re welcome ;-)

Let me proceed with your calirbated frames.

3) ANALYSE STARS, we can keep all settings at default ;-)

After star analysis, APP reports the amount of stars found with the supplied settings and also mininimum and maximum FWHM of your stars in the light frames. The more the minimum and maximum FWHM deviate the…[Read more]

Damn Mabula, this is awesome! It really shows how to proceed and think about how to go about the workflow, which is quite different from what I did at first. It makes a lot of sense, great to learn it and thanks a bunch!

This actually looks pretty bad, only signal in the red channel.

Luckily there is a very good explanation. This is H-alpha data shot with a H-alpha filter.

APP can deal with this immediately and properly. You don’t need to split the channels to work only with the red channel. You can just select the H-alpha debayer algorithm to immediately show…[Read more]

With APP we can now visually check the effect of the master calibration files on the light frame.

At the top of our application we have a dropdown box which is set at linear by default. This means: show the linear data ;-)

We can select now L-calibrated, this means: show the linear calirbated data. So you don’t need to actually apply the…[Read more]

Now we have all master calibration files properly created for our light frames.

We have a Bad Pixel Map, a masterdark without bias subtraction and we have a smooth master flat of bias subtracted flats and BPM corrected as well.

We need to remove the flats from our list.

And we make sure only the (second )BPM, masterdark and masterflat is…[Read more]

Finally let’s make the master dark, first remove the flats of the list and unselect the master bias, since we don’t want to subtract the master bias from the darks.

2) Calibrate master dark settings

I’ll use median again. Again if you have more than 10-20 darks, use average and outlier rejection. Since one of the darks is 350 seconds and the…[Read more]

Now we’ll create the master flat. We need to select the flats, the masterbias and the BPM will help as well to correct bad pixels in the flats.

I’ll remove the bias frames from the list by clicking all next to the bias button in 1) LOAD, this will deselect them and then press clean to the right of this button. Now the bias frames are…[Read more]

Now we proceed to the creation of the master bias, master dark and master flat.

We need to stop and think about our calirbation routine now.

I want to calibrate the flats with the master bias, to properly remove the bias pedestal of the 6D camera of Vincent.

But I don’t want to calibrate the darks with the master bias. If I remove the bias from…[Read more]

We see in the BPM statistics that  APP detected almost 2% of hot pixels. This probably is too high.

I”ll be making another BPM with a bit higher hot kapps value. I’ll take 3 kappa.

Now the hot pixel % dropped to about 1.6% , which is still quite high. We will see what it does in the actual calibration of the lights later on.NewBPMNewBPMStats

About the BPM (Bad Pixel Map):

Gray pixels mean linear pixels

black pixels are cold pixel

white pixel are hot pixels.

We see a lot of pixels that seem to behave non-linear and can be considered a bit hot. But maybe we are seeing to many and our hot kappa value was too low.

We also see some cold pixels, these are pixels of the raw borders of…[Read more]

The Bad pixel map uses darks for hot pixel detection, en flats for cold pixel detection.

Hot pixel kappa setting : default is 2 kappa.

Cold pixel % : default is 50%.

The darks and flats are combined to a masterdark and masterflat internally.

Then the masterdark is locally analysed. All pixels that deviate more than the

PixelValue >…[Read more]

2) CALIBRATE

we scroll down to the Bad Pixel Map options and select create bad pixel map.

If you create a good Bad Pixel Map, you will be able to use this for a very long time with high efficiency.

The bad pixel map will be created using only the darks and flats.

First we deselect the lights and bias, by clicking on the all button next to the…[Read more]

We see that all data is shot using ISO 1600.

The light frames have an exposure of 300 seconds. just like the darks, one of the darks is 350 seconds, but that’s no problem.

We don’t have a Bad Pixel Map yet of the sensor of VIncent’s camera. Let’s make that first using his darks and flats.

The bad pixel map will correct the non-linear pixels of…[Read more]

We load all data:

light frames by pusing the light button, darks by pushing the dark button, flats by pushing the flats button etc..

Notice how the files in the filelist show their type.

And in the 1) LOAD panel, we see a counter for the number of frames we have just loaded.LOADData

We start APP and select our Working Directory.

This Work Directory will be used for temporary files during stacking and the results will be saved here. Try to use a hard disk partition with enough free space and possibly the fastest drive you have on your computer. This will speed things up.

We choose the folder with our project data, with…[Read more]

Een dag later.. zit alles goed op de plaats met 2.3mm ringdikte en 7.8mm boutjes. Pos 1: Hutech IDAS -P2 (als Luminance), dan R.G.B van Baader en op positie 5 een 7nm Ha van Baader. Ik heb gekozen voor dat Hutech IDAS filter als L filter omdat een L filter het volledige zichtbare spectrum doorlaat en er een prachtig gat tussen G en B zit op de…[Read more]