Thursday, January 20, 2011
IC 1396 reprocessed
Since my processing technique gets better and weather doesn't give any support, I have reprocessed some older images. There is now star colors added and other processing is tweaked too.
IC 1396
In constellation Cepheus
Image is in HST-palette, (HST=Hubble Space Telescope)
from the emission of ionized elements, R=Sulfur, G=Hydrogen and B=Oxygen.
Star colors are mixed from the NB channels, Red=H-a, G=O-III and B= 85%O-III + 15%H-a.
Nebula is imaged with a Tokina AT 300mm f2.8 camera optics and the QHY8 cooled astro camera.
Technical details with an original image.
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.
Star colors are mixed from the NB channels, Red=H-a, G=O-III and B= 85%O-III + 15%H-a.
Original versions from October 2008, with technical details:
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4 comments:
Hi JP,
I was admiring your work once again and looking at the 300mm Tokina images. I noticed that you have used the QHY9 together with a filterwheel. How did you do that? I have a Nikon 300mm F2.8 for that purpose, but it has only about 55mm of backfocus, which is eaten up by the adapter nikon to T and the camera body itself, nomore room for a filtersolution. Can you explain?
Peter
Hi peter,
FW's are kind of slim now a days. My QHY-FW takes about as much space as a filter drawer I used earlier. I have a Canon EF 200mm f1.8, and it works with a FW too.
I will take a photo tonight and post it to here to see.
Note!
Least a Tokinal lens is extremely sensitive to a right distance, not too much nor too litle. I had terrible image quality at first with my Tokina. After I added 0.5mm spacer, the image quality turned to perfect!
How can we connect a Nikon lens to the QHY9/FW?
Is there a single adaptor?
Hi,
I have replaced the camera lens bayonet with a threaded adapter. The best place to ask, if there is an adapter available, is the QHYCCD forum, please have a look here: http://www.qhyccd.com/ccdbbs/
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