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Saturday, May 21, 2011
I have shot many targets with several focal lengths.
Due that, I will publish some older images 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 images to show the angular scale in a sky.
The full Moon has an angular scale of ~30 arc minutes in a sky, that's equal to ~0,5 degrees.
A wide field image of the area
NOTE. The size of the full Moon (0,5 degrees) is marked as a gray circle at upper Left corner.
A wide field image of the area, covering about 5 degrees, ~300', of the sky.
(Ten full Moons side by side)
Two main objects can be seen in the image:
IC 1805, the "Heart Nebula", locates at upper Right.
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!). Original Blog post can be found HERE.
A zoom in image series of IC 1805, the "Heart Nebula"
In this zoom in series, three images from IC 1805 are taken by using different focal lengths.
A gray circle shows the size of the full Moon, ~30' or ~0,5 degrees.
First image is taken with a focal length 200mm, Canon EF200mm @f1.8
Second image with a SkyWatcher 80ED ~600mm f7.5
Third one with Meade LX200 GPS 12" ~2000mm f6.5