Hello all
i m strugglin since a few hours to process the file of job 1196.
i cant find a way to calibrate correctly Lum file .
all the fits of this job are shoot in september so i use the latest calib file .
Here is the result of the integration with WPBB with Lum file and calib file:
We can see lots of dust donut
i try all sort of combination of calib file , corrected flat film by adding some value , it doesnt work
after a while i integrated without any flats :
And here is my flat file used before :
we can see that the big donut low-left , is not exactly at the same place on the flat file than on the integration file.
it is obvious if you switch rapidily between frames in pixinsight.
I think that the cam has rotate since the flat have been shoot or that dust have move .
As it is an open scope , i think that flats have to be taken more more often than one each 6months
Also , with this camera , you should take way longer flat . the LUM flat are 0.02s long exposure. I ve read that on some cmos camera , very short exposure raise problem. I think you should try a dimmer flat planel and have flats shoot with +1s long exposure .
i dont know if somebody have succeeded to deals with L file on this scope but if yes, please share the recipe
thansk
florent
i m strugglin since a few hours to process the file of job 1196.
i cant find a way to calibrate correctly Lum file .
all the fits of this job are shoot in september so i use the latest calib file .
Here is the result of the integration with WPBB with Lum file and calib file:
We can see lots of dust donut
i try all sort of combination of calib file , corrected flat film by adding some value , it doesnt work
after a while i integrated without any flats :
And here is my flat file used before :
we can see that the big donut low-left , is not exactly at the same place on the flat file than on the integration file.
it is obvious if you switch rapidily between frames in pixinsight.
I think that the cam has rotate since the flat have been shoot or that dust have move .
As it is an open scope , i think that flats have to be taken more more often than one each 6months
Also , with this camera , you should take way longer flat . the LUM flat are 0.02s long exposure. I ve read that on some cmos camera , very short exposure raise problem. I think you should try a dimmer flat planel and have flats shoot with +1s long exposure .
i dont know if somebody have succeeded to deals with L file on this scope but if yes, please share the recipe
thansk
florent
Yeah looks like we are not using the Hb anyway. I agree we should remove it first.
Do you think we can pause any LRGB target before we confirm there is no issue with the flats?
The HB filter has been removed, I suggest a quick test object in LRGB this evening
1, something that is up high
2, ask it to ignore moon avoidence
3, say 20 x 60s subs in each filter
4, I will ask pete to do a new set of LRGB flats
You can then check to see if it has solved the issue
Am I ok to put a test job in the pier, please let me know ?
Cheers
Steve
Please ignore my dylexia wherever possible, just be thankful I can control my Tourettes ;)
Things to do, so little time!
Steve
Roboscopes Tea Boy
0
Undo
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Yeah looks like we are not using the Hb anyway. I agree we should remove it first.
Do you think we can pause any LRGB target before we confirm there is no issue with the flats?
Do you think we can pause any LRGB target before we confirm there is no issue with the flats?
Pete and myself have been testing Pier-1 this afternnon and this if what we think is going on....
The new HB filter that was fitted had a slightly deeper cell than the other filters and although we did check when we were in Spain and it seemed to rotate just fine. When the scope is pointing up in imaging mode the cell is dragging on the filter wheel internal wall and this is causing slight variations in final filter positioning.
Whilst not enough to make any difference to the subs, flats however are a different ball game
what we propose is
1, we are going to have the HB filter removed from the filter wheel and if that does not work
2, we will replace the wheel whith another we have in Spain already
I would rather try the HB filter removal first as this wheel has 3nm Astrodons while my spare wheel is not as luxuriously appointed
Steve
The new HB filter that was fitted had a slightly deeper cell than the other filters and although we did check when we were in Spain and it seemed to rotate just fine. When the scope is pointing up in imaging mode the cell is dragging on the filter wheel internal wall and this is causing slight variations in final filter positioning.
Whilst not enough to make any difference to the subs, flats however are a different ball game
what we propose is
1, we are going to have the HB filter removed from the filter wheel and if that does not work
2, we will replace the wheel whith another we have in Spain already
I would rather try the HB filter removal first as this wheel has 3nm Astrodons while my spare wheel is not as luxuriously appointed
Steve
Please ignore my dylexia wherever possible, just be thankful I can control my Tourettes ;)
Things to do, so little time!
Steve
Roboscopes Tea Boy
Thank you for the additional info....I will go through them and see if we can solve the problem
Peter Shah - Collimation & Telescope servicing.
Visit my personal imaging website at astropix.co.uk
For Image Processing Tutorials
Contact: pete@ccdimaging.co.uk
We can supply your new high quality Newtonian or Dall Kirkham Astrograph
Visit my personal imaging website at astropix.co.uk
For Image Processing Tutorials
Contact: pete@ccdimaging.co.uk
We can supply your new high quality Newtonian or Dall Kirkham Astrograph
Peter Shah
Roboscopes Observatory Controller
0
Undo
Votes
I didnt see anything on the narrowband.
for LRGB, its mainly L and some residual of Green (or blue i cant remember) Red is fine as far as I can tell
for LRGB, its mainly L and some residual of Green (or blue i cant remember) Red is fine as far as I can tell
Thanks for the lightning response.....is it just the LRGB or have you noticed it on any of the narrow band? Now I know there is more that just this data set I will be taking a good at this tomorrow see if we can figure out what is going on.
Peter Shah - Collimation & Telescope servicing.
Visit my personal imaging website at astropix.co.uk
For Image Processing Tutorials
Contact: pete@ccdimaging.co.uk
We can supply your new high quality Newtonian or Dall Kirkham Astrograph
Visit my personal imaging website at astropix.co.uk
For Image Processing Tutorials
Contact: pete@ccdimaging.co.uk
We can supply your new high quality Newtonian or Dall Kirkham Astrograph
Peter Shah
Roboscopes Observatory Controller
0
Undo
Votes
All of the LRGB datasets (NGC 772, Darco, M74 for example) that I have tested are affected.
I am downloading this data set atm, may I ask is this the only data set effected or do I need to look at any others on Pier1?
Peter Shah - Collimation & Telescope servicing.
Visit my personal imaging website at astropix.co.uk
For Image Processing Tutorials
Contact: pete@ccdimaging.co.uk
We can supply your new high quality Newtonian or Dall Kirkham Astrograph
Visit my personal imaging website at astropix.co.uk
For Image Processing Tutorials
Contact: pete@ccdimaging.co.uk
We can supply your new high quality Newtonian or Dall Kirkham Astrograph
Peter Shah
Roboscopes Observatory Controller
0
Undo
Votes
I processed the new flats and soem new datasets this weekend. Stil there are 3D donust from the dust, especially for the Lum filter.
t seems that the dust patterns in the MasterFlat and light frames are not aligned.
I then integrated all Lum from NGC 772 without registering to highlight the dust patterns and compared with the MasterFlat of Oct in pixinsight. Sure enough, some of the dust clearly shifted, by around 10-20 pixels.
The new flats were taken from Oct 13 nad the Lum frames of NGC 772 were mostly in Oct 12 so I don't think think likely the dusts changed during this time.
Do you guys have any ideas why this happened? Could there be shifts/sags in the system or the angle of lights hitting the sensor?
t seems that the dust patterns in the MasterFlat and light frames are not aligned.
I then integrated all Lum from NGC 772 without registering to highlight the dust patterns and compared with the MasterFlat of Oct in pixinsight. Sure enough, some of the dust clearly shifted, by around 10-20 pixels.
The new flats were taken from Oct 13 nad the Lum frames of NGC 772 were mostly in Oct 12 so I don't think think likely the dusts changed during this time.
Do you guys have any ideas why this happened? Could there be shifts/sags in the system or the angle of lights hitting the sensor?
job 1186 was shoot after maintenance , frame between 19/09 to 28/09
Cool, as soon as the next cloudy night comes along we will take some new flats :0
Steve
Please ignore my dylexia wherever possible, just be thankful I can control my Tourettes ;)
Things to do, so little time!
Steve
Roboscopes Tea Boy
Yes not a problem but the skies have been clear this week so we dont waste imaging time collection flats
As soon as we know the roof is closed for cloud we will be getting new ones, however did you check the dates on the fits header just in case ?
Steve
As soon as we know the roof is closed for cloud we will be getting new ones, however did you check the dates on the fits header just in case ?
Steve
Please ignore my dylexia wherever possible, just be thankful I can control my Tourettes ;)
Things to do, so little time!
Steve
Roboscopes Tea Boy
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