Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.

Messages - rtemen

Pages: 1 2 3 [4] 5
Hi, again.
Now that they all aligned, I stacked them.
The resulting file is quite disappointing.
I have been running several tests/experiments with this set of files.
What I seem to be seeing is that no matter if I stacked these shots with or without using flats, it results in this file which looks identical to me whether I used the flats or not.
Then, I followed several tutorials out there on the internet, and I cannot get rid of any of that rainy streaky looking stuff.
Would you (or anyone else that can see this file), have some time to analyze it with the pixinsight tools to let me know if there is something drastically wrong with the file so that I may learn what is happening?

Here is the link to the file.

Thanks to anyone who can look at it and coach me.


Thank you much.
That did the trick.

I have 10 lights of M104 and I have tried a dozen times or more to get them to star align.
I have tried many tweaks of various parameters, to no avail.
Would anyone be able/willing to look at the two sample files and let me know what I need to do to get them to align?

Here are the two files:


I took many 3 minute exposures of the asteroid moving through Coma Berenices the other night.
Is it possible to stack some of them together to create a 'mosaic'  showing the trail of the asteroid among the stars.
I am able to align the stars but would like to blend them together to see the total path of the asteroid.


Hi, Rob.  Sorry for the delay since our last communication.
Some questions if I may.
You indicated that there is a zip file 'there' that I didn't download.
Where is this zip file and what is it for?

You described how the pictures can drift a bit as each picture is taken.
I am pretty sure that with the same equipment and procedures, I sometimes can get a collection of shots with no drift, and sometimes they will drift from pic to pic.
What do you think would be the cause of this?  Perhaps I need to better adjust something.


I have a Celestron C11, and last week I purchased a Meade f/6.3 reducer.
Before adding the reducer, I was doing fairly well with taking lights and flats and getting a pretty good result.

Now, after adding the reducer, I cannot seem to get anything to work right.
The calibrated file looks horrible, and I do not know enough about PI to determine what is up at this point.
I tried diligently to take my flats the same way as I did with the scope before the reducer was added.

I am attaching a Light, a flat, a masterflat and a calibrated result.
Would anyone be able to examine these files to see if there is something wrong with any of them, and what I need to do to correct the problem?
Here is the folder with the 4 images.
The folder is M101-Flats
Thanks for any help on this.
I think the dropbox link aboce should allow you to get all four files.
If not, let me know.


Hi, Rob. Thanks for the response.
I am new to PI, so I was wondering if you could educate me a little.
I thought that a hot pixel is actually a pixel on my camera sensor that is 'stuck' in a white mode, so we need to have the program not think it is a star.
How would that account for that diagonal streaky 'rain' pattern that is evenly across the whole picture?
You can point me to a tutorial that describes this as well if that is easier.


I have finished stacking all of my files, and when I try to use either DBE or ABE, I cannot seem to clean up the background at all.

Here is the stacked file.

Can anyone look at this file and tell me what might be wrong with the file, or what the proper procedure would be to have more success?


ABE is where you need to select an area that is supposed to be the closest to black like the sky.
My images have the nebula filling my pictures, so there is no area that is really 'black' like the sky around the nebula.
So I picked the 'darkest' area that I could find.
Well, after all was said an done, the resulting pictures looked pretty poor.
Since the nebula fills my picture, should ABE be skipped?

I have a number of shots of Orion and I would like to learn how to stack and then post process.
All of my shots are such that the picture is all in the nebula.
Meaning, there is no black space.  Many of the tutorials that I have found so far start out with picking a darkest and lightest area to do the calibration.
But, since I have no 'empty space' in my pictures, I do not know how to proceed in processing.
Anyone know of a good tutorial for this kind of job?


Thanks, Jim and Rick.
I see now.


In the tutorial  tutorial-pre-processing-calibrating-and-stacking-images-in-pixinsight.html#Section1
I find that there is a description that I do not understand.
I am attaching a jpg of the screen that shows the text that I am not clear on.
In the text above the picture, he points out that, like him, he does not use the darks at this stage.
Then below the picture, it seems to point out that it should be used.

Any thoughts on this would be appreciated.
I am not sure what the difference would be or how it will affect the next steps.


Thanks, that worked.

I am using PI to process my pics. I am following the instructions suggested to me over at Light Vortex.
I am at a place where it is asking me to enter the gain of my camera chip in e/ADU.
I have not been able to find this information for several hours now.
Does someone have a chart of gain values for different cameras?
I have a Rebel T3i (600D).
Also, it was suggested that I could use the script Basic CCD Parameters, but it crashes when I try to use it.


All of the tutorials that I am finding seem to start with the 4 B/W files LRGB, or .fit files to start.
Is there a tutorial that steps through using my Color CR2 files, or how to convert them to fit files?


Pages: 1 2 3 [4] 5