Color in Orion
Posted 23 November 2012 - 06:35 AM
Posted 23 November 2012 - 07:01 AM
but no color in smaller scopes
Posted 23 November 2012 - 07:20 AM
Your wife probably didn't have dark adapted eyes like you.
Posted 23 November 2012 - 07:20 AM
Posted 23 November 2012 - 07:59 AM
Posted 23 November 2012 - 08:41 AM
Welcome to Cloudy Nights!
Posted 23 November 2012 - 08:42 AM
Posted 23 November 2012 - 10:21 AM
Posted 23 November 2012 - 11:03 AM
One need not be well dark adapted to see the greenish color of such a bright nebula as the inner region of M42; the surface brightness is just about as high as any nebulosity can get.
The only red I'd credit the possibility to detect would have to be in or near this brightest central region, in order that the surface brightness be high enough to activate the retina's cones. And then the red must 'compete' with the more readily seen and vusually dominant green. In the outer parts of the nebula the surface is just too low to detect the red. It's well known that in even colorless glows the visual system tends to perceive the brighter and dimmer parts as greenish and reddish, respectively. Of course, the great familiarity we have gained from innumerable color images must at least on a subconscious level lead to bias. I don't recall observations from the age of visual observtions prior to color imaging which reported unambiguous detection of reds in nebulae like we find today. And the instrument is not a factor here; the poorer system transmissions in the days of old were not sufficiently bad to make that much of a difference at all.
Through a 16" I've managed to detect a hint of red in the Huygenian region of M42. It was subtle at best, what with the preponderance of those pesky greenish photons flooding the view. But red outside that region? Not for me.
Posted 23 November 2012 - 11:35 AM
But red outside that region? Not for me.
The workings of the eye are rather complicated, I offer no explanations...
After only seeing the green for the past 20 years or so, in the past year, viewing the Orion Nebula from a dark site with my 12.5 inch, 16 inch and 25 inch scopes using exit pupils of about 3mm-4mm, I often see the central region as "electric green" and the "wings" as a faint, rust red.
It might be that the red is merely result of the brain's processing the image, that the red results from it being a complimentary color to the green.
I do question the need for a fully dark adapted eye since dark adaptation does not improve one's color vision, I suspect a fully dilated eye which only takes a moment that is in the process of adapting might be best suited for seeing color. In my experience bright nebulae like NGC6572, the Blue Racketball show the most color when there is some bright light (the moon works well) around. Earlier this year while viewing for a normally dark site with a nearly full moon, NGC6572 appeared more intensely green than I had previously seen it. It remained green at high magnifications (small exit pupils) in scopes both large and small..
Posted 23 November 2012 - 05:19 PM
Posted 23 November 2012 - 05:29 PM
Scotopic (night) vision is essentially color blind.
Be that as it may, under excellent conditions I have on a number of occasions seen blue and green shades in the area around the Trapezium and a brownish-red hue in M42's wings through large aperture Dobs from dark sites.
Posted 23 November 2012 - 05:34 PM
Posted 23 November 2012 - 05:58 PM
A Bork...with a little Color around the edges.
Posted 23 November 2012 - 07:09 PM
Posted 23 November 2012 - 07:29 PM
Congratulations on such a fantastic sight!I do believe you.I have good reason to know and understand everyone's eyesight is not the same.
I am new to observing. I was out tonight with my 12" Dob. Normally Orion is a colorless fan shaped cloud. Tonight after a few hours viewing I went to Orion. In the center was cobalt blue, and the edges of the fan were very pink. I had my wife look at it but she saw no color. Every time I looked the color was unmistakable. Is this my imagination? Why couldn't my wife see it? I also noticed more detail than any other viewings, and it seemed larger.
The Orion Nebula is one of my favorite objects .Usually it just looks gray,and very rarely a faint rose.The extent of the nebula grows the longer I am out viewing so that it is well beyond the FOV of my modest plossls even the 25mm. Several nights this fall have been very good with the nebula as large or larger than I had seen it ,yet no color ,though it looked three-dimensional more so than in previous years.Viewed this fall with scopes of 5 (Bushnell Mak)to 12 ( Z12) inches and always striking appearance.
I think you must be lucky and have sensitive color vision.
Posted 23 November 2012 - 09:16 PM
Posted 23 November 2012 - 09:32 PM
Posted 23 November 2012 - 11:47 PM
But as long as you are out there and excited is enough...Your mind can play some amazing tricks when desire is high enough...
Posted 24 November 2012 - 07:05 AM
Posted 24 November 2012 - 10:09 AM
Posted 24 November 2012 - 10:41 AM
I remember there was a German girl who was able to recognize people at much greater than the usual distance;this was tested and verfied. Much rarer than one in a million.
Posted 24 November 2012 - 11:22 AM