Hi,
I'm very happy with the little Raspberry operating with Astroberry. Will be perfect for my portable astro equipment when I have finished it.

Now to a problem or two.

When doing flat frames it's important to know the levels are correct, especially when color cameras.

The KStars FITS viewer is only at 8-bit resolution and maybe not linear either. How search the forums for something better but can't find anything. Without that the flat frames will never be correct.

An alternative is to transfer the images to my stationary PC Windows machine over the local net. Earlier when I had an Astroserver built on a Windows machine I could easily transfer the files with UltraVNC which I use even today but the Astroberry version of VNC could not transfer files.

What I had to do is to move the USB stick from the Raspberry to the Windows machine, many times, until I got correct levels of the flat frames.

Does any know how to solve these two problems (fits viewer with 16 bit linear and file transfer) to make it easier to use ?

Here you can find how I do the flat frames and understand my problem:

www.astrofriend.eu/astronomy/tutorials/t...flatcalibration.html

It's still a prototype but work very well.

/Lars

Hi Lars

You could use WinSCP to copy the files to your windows PC. I use this to copy the images during a session.
winscp.net/eng/index.php

WinSCP should work, also I'm pretty sure that the astroberry has a "astroberry" windows share, so you can just browse to it from another computer.

Hi,

I also use WinSCP, never had a problem with it.

Doug

Great, that sounds like that the WinSCP will be my solution when making my calibration images at home.

Many thanks for that info. I will test it during daytime tomorrow.

When out on the field it can also be interesting to analyze the levels of the raw signal direct in the Raspberry, but not that important. Maybe there will be some tool to make linear histogram of raw values in the future.

/Lars

Today I have tested the WinSCP, worked great. Now I can do my flat image must faster when I can analyze them in the Windows PC.

Thanks a lot !

/Lars

There is option for controlling the histogram at Settings menu -> Configure KStars -> FITS -> non linear histogram

Hi Jarno,
I tested different settings in the KStars FITS menu. I got different results. What I can see, the X-axis is still nonlinear and expressed as a 8-bit 0 to 255 levels. Above I have the raw CR2 file as a CFA format. Both X and Y are linear. I think I can use the KStars FITS histograph for a rough selection and the relation between the colors are no problems, the last check I do in Windows with some more advanced tool. It's a progress.

 

/Lars

Maybe you already know, but if you need to establish exposure time to reach target ADU, you can use the "Calibrate" button that enables when you choose "Flat" for image type in capture tab.Then Ekos will automatically find correct exposure before taking your flat sequence.

Hope this helps.



 

@Jarno

Much better now when I changed the paameters yo told me about. But there is something wrong, the histogram doesn't update with new photos, I have to close down the histogram and FITS viewer and take a new photo to see the update.

@Matteo

Interesting, I will test that function later on

/Lars

Lars post=78811 userid=3671
-  but the Astroberry version of VNC could not transfer files.

/Lars

Just for the record, the VNC server in Astroberry does transfer files. Click on the black VNC button in the Taskbar, and select the file transfer option from the menu list. I used this for a long period, but these days I prefer using the Samba server option by creating a network drive in Windows File Explorer which gives me simpler and consistently faster transfer connections.

Strange, when I ggoled on this subject one year ago I got the impression that it was very difficult. Now I ahve at least two solutions, WinSCP works very well, but I will test Astroberry VNC later.

Thanks for all information !

/Lars