Friday, December 31, 2010

The first 4 inches are the most important

Apochromatic telescopes with an aperture of four inches are prooved to be very useful both in stationary and in portable use.

Sunday, December 12, 2010

A beautiful telescope

Let's get a look at this beautiful telescope. This new astrophotographic system belongs to a friend. It consists of a:
Here is the very first image taken with this amazing scope. Ladies and Gentlemen, this is a 10 second test exposure of the seven sisters. Here are the Pleiades !

Saturday, October 30, 2010

The prize for your patience is a better photo

Please sit down and watch this! This is the price for the patience of some astrophotographers. The difference in S/N (signal-to-noise) ratio and the count of visible details is really noticable if you compare both Ha narrowband photos of NGC1893 in Auriga shown above. The first astrophoto is the result of an exposure of 960 seconds. The second one is a median stack of 5 x 960 seconds 2 x 600 seconds. It's incredible isn't it? The original high resolution picture can be found at

Thursday, October 28, 2010

AstroDigital.Net on the Kindle

This is my homepage on the Kindle ebook reader of The Kindle is thin, light, portable and suitable to read ebooks. The 3G version is Internet capable.

Saturday, October 23, 2010

NGC2404 is a nebula in the galaxy NGC2403

This is an underexposed test photo of the galaxy NGC2403 in the Camelopardalis constellation. The integration ime was 3x3 minutes on each LRGB channel at f/3.6. It has been 2x digitally zoomed in MaximDL.
NGC2404 is a nebulous region in the external galaxy NGC2403. This faint object is located in the Camelopardalis constellation. The 3rd astrophoto shown above is one 16 minutes exposure at 385mm FL at f/3.6 using an SBIG ST-7XME NABG astrocamera under the light polluted skies. It has been digitally 2x zoomed with the software MaximDL. The spikes are overflowed pixels caused from bright stars due to the missing antiblooming gates of the used astrocamera.
See also:

Thursday, October 14, 2010

The autoguider settings in CCDSoft

These are the settings I am using for the system described in the categories below. You may also consult the CCDWare autoguider calculator to find out the proper settings for yours.

Monday, August 09, 2010

How to process Jupiter with GIOTTO

These are the settings I used recently to process my Jupiter photo. The software you see is available in german language. Don't forget to make a "white balance" with MaximDL after finishing it.

RGB vs. RRGB in planet photography

If you are a planet photographer and you make video sequenses with a color webcam, I have a good tip for you. After adding the avi video stream with GIOTTO or Registax, separate the R/G/B channels with MaximDL or GIOTTO. Copy the R channel to a new file to use it as luminance. Finally load all four files in CCDSoft to make a RRGB composite. You can compare the results on the photo above.
The RRGB processing brings out invisible details of a RGB photo. My RRGB composite above is sharper than the RGB although I think the RGB has better colors than the RRGB. One problem I can mention, is that the red channel as luminance can not match the green or blue details of the planet. Normally, a "real" luminance channel should match all the colors of a RGB photo. That's not the case in RRGB. But as you know, the red channel is immune against atmospharic turbulences, this is the reason why in MY case the red channel shows more details than the green channel. The bayer mask of an OSC cam has two green pixels but only one red pixel. Hence the green channel could better serve as a luminance channel under perfect seeing conditions (in the space ;-). I think so. If a reader has a suggestion please comments this topic. Thanks.

Monday, August 02, 2010

The storms on Jupiter

Last night, the seeing was surprising good here in South Germany, so I decided to observe Jupiter with my Takahashi Mewlon 210 telescope. The views of this planet were stunning indeed, even at the high magnification of 300x using a Takahashi 7mm LE eyepiece. After this observation, I decided to attach my Imaging-Source DBK21 color webcam on the telescope and to take some photos.
Here you can see the results.
You can see even the storms on the planet. It is amazing, isn't?
Made in Stuttgart on July 31th, 2010 with a Mewlon 210 telescope at 6000mm focal length. All pictures are RRGB composites. An animation of the above photo series is available in my site at / Chapter "Jupiter"

Thursday, June 10, 2010

Blog.AstroDigital.Net on your iPhone / iPad

Use the following address to access my blog:

Sunday, June 06, 2010

Comet McNaught C/2009 R1

This is photo of today morning showing the comet McNaught C/2009 R1. Visual magnitude:+7.4 mag. Distance: 179'900'000 km. Telescope: FS-102 (F/5.6), Camera: ST7XME NABG binned 2x2, Integration: 1x5 Min, No Guiding, Software: MaximDL, CCDSoft, PSE

This is a video showing the motion of McNaught.

Tuesday, May 11, 2010

M12 a globular star cluster in Ophiuchus

This is the globular cluster M12 in the Ophiuchus constellation. Notice the faint galaxy pair next to this cluster at 2:30 o'clock. The brightest galaxy of this pair is called PGC1103219

Sunday, January 24, 2010

M31 - Ultra high resolution

Copyright (c) 2009-2010 by Holger Weber
Strong modified GSO carbon newton 200mm f/5 w. Starlight-FeatherTouch
CCD camera: AllCCD9Pro color
Mount: Losmandy G11 w. Gemini GOTO
Description: This mosaic consists of 4 segments
Guiding: Watec CCD on SkyWatcher Maksutov
Copyright by Holger Weber, Germany
Co-Author of
Software: Deep-Sky-Stacker (DRIZZLE stacking method)

Processing Mars OSC photos in RRGB...

Tonight, I would like to show you how I processed my recent Mars photos. The RRGB (Red-Red-Green-Blue) technique is applied. All photos are made with a user friendly One-Shot-Color WebCam (model: TIS DBK12 USB)!

YES! You can increase the resolution of your Mars photos using this planet processing technique. Here is a screenshot of my computer desktop during practicing it. This technique is an idea I have had a couple of hours ago. It seems to work!

  • Capture your planet as a video stream (avi file) in the allowed time window according to the resolution of your telescope+webcam combination, the planet (i.e. Mars) and its apparent size in the firmament. If you want to find out how long you can record the planet in a single avi file without to have a smearing effect caused by the planet rotation then run my free software "AstroDigital.Net". It computes it!
  • Stack your avi file by using the GIOTTO software. The result is the automatically generated .FITS color file "resultcopy" in the same directory as your avi file.
  • Sharp your resultcopy file by using the GIOTTO software. Save the result in a .FITS color file called "resultcopy_sharp_390.fits":

  • Load the color file resultcopy_sharp_390.fits in MaximDL. Make a TriColor split to separate the three sharped channels R,G,B. Save them in your harddisk as:
  1. resultcopy_sharp_390-R.fits
  2. resultcopy_sharp_390-G.fits
  3. resultcopy_sharp_390-B.fits
  • Duplicate the resultcopy_sharp_390-R.fits file as resultcopy_sharp_390-L.fits (L means Luminance, i.e. we will use the red channel as luminance) in the Windows Explorer window.
  • Load the resultcopy.fits in MaximDL. Make a TriColor split to separate the three channels R,G,B. Save them in your harddisk as:
    1. resultcopy_390-R.fits
    2. resultcopy_390-G.fits
    3. resultcopy_390-B.fits
  • Load the files resultcopy_sharp_390-L.fits , resultcopy_sharp_390-R.fits, resultcopy_sharp_390-G.fits, resultcopy_390-B.fits in CCDSoft.
  • Adjust their histograms.
  • Invoke "Color Combine" window.
Congratulations! Your RRGB Mars image is ready! Note the difference in resolution between the original RGB image from your OSC Webcam and your RRGB composite. It's a huge step up, isn't it?

Sunday, January 03, 2010