Thursday, May 19, 2011
Wide field vs closeups, North America & Pelican Nebulae, NGC7000
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.
North America & Pelican Nebulae, NGC 7000 & IC5070
An emission Nebula in constellation Cygnus
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.
This composition is very close to a visual spectrum.
NOTE. The size of the full Moon (0,5 degrees) is marked as a gray circle at lower Left corner.
A wide field image of the area spans about 4,5 degrees vertically (Nine full Moons side by side)
I have closeup images from two areas:
First one shows the "Great Wall" area just Left from the image center.
The "Head of the Pelican", in a second closeup image, locates at center next to a Right edge.
Image was shot with a Tokina AT-X 300mm camera lens at F2.8. A Baader narrowband filter set was used, the total exposure time was about 3h. Original Blog post can be found HERE.
Closeup of NGC7000, the "North America Nebula"
A HST-palette closeup of North America Nebula's "Great Wall" area.
Image width is ~30' = ~0,5 degrees, one full Moon size
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 ~6 hours. Original Blog post can be found HERE.
Closeup of IC 5070, the "Pelican Nebula"
A "Natural" color closeup of the Pelican Nebula.
Image width is ~30' = ~0,5 degrees, one full Moon size.
Note! In wide field image above, this area is rotated 90 degrees counter clockwise.
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 ~6 hours. Original Blog post can be found HERE.
Closeup of a closeup
A closeup from the image above in HST-palette.
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