IC1848, the "Soul Nebula", apparent scale in the sky

I have shot many targets with several focal lengths. 

Due that, I will publish some of my material as an image sets, with different field of view and detail levels.

The fractal nature of our universe stands out nicely by this way and it will make the orientation more easy.

Many times, it's difficult to understand the image scale of astronomical images.

Due that, I will add a Moon circle in some of the images to show the angular scale in a sky. 

The full Moon has an angular size of ~30 arc minutes, that's equal to ~0,5 degrees.

IC 1848 zoom in

In constellation Cassiopeia

Image is in HST-palette from the emission of ionized elements, R=Sulfur,

 G=Hydrogen and B=Oxygen. NOTE. The size of the full Moon (0,5 degrees) is marked as a gray circle in all of the images.

IC 1848, second zoom in

NOTE. The size of the full Moon (0,5 degrees) is marked as a gray circle in all of the images.

Natural color composition from the emission of ionized elements, R=80%Hydrogen+20%Sulfur, G=100%Oxygen and B=85%Oxygen+15%Hydrogen to compensate otherwise missing H-beta emission. Star colors are mixed from the NB channels, Red=H-a, G=O-III and B= 85%O-III + 15%H-a.This composition is very close to a visual spectrum.

Images used in the series above from top to bottom

1. 
   A wide field image of the area, covering about 5 degrees, ~300', of the sky. (Ten full Moons side by side)
   
   
   
   IC 1805, the "Heart Nebula", locates at upper Right and  IC 1848 can be seen at lower Left. Image is shot with a Canon EF 200mm f1.8 camera lens and a QHY9, a cooled astronomical camera.
   
   
   
   Baader narrowband filter set, total exposure time was ~1,5 hours (A very fast lens was used!).
   
   


2. 
   A medium wide field image is shot with a Tokina AT-X 300mm f2.8 camera lens and a QHY9, a cooled astronomical camera. Baader narrowband filter set, total exposure time was ~5 hours .
   
   


3. Last image was shot with a Meade LX200 GPS 12" telescope @ f0.5 and a QHY9, a cooled astronomical camera.Baader narrowband filter set, total exposure time was ~2,5 hours. 

Links to the original images, used in series, from top to bottom

1. http://astroanarchy.blogspot.com/2009/01/firs-light-for-qhy9.html


2. http://astroanarchy.blogspot.com/2011/02/ic-1848-soul-nebula-finalized.html


3. http://astroanarchy.blogspot.com/2010/03/soul-nebula-closeup.html