here's one of my latest images, the Lamda Centauri Nebula - IC 2944.
The image is 6 x 4-minute exposures @ ISO-200 (24-minutes total) with my Hα/IR enabled Canon EOS 300D on the 12-inch f/5 telescope. Used the Baader Coma corrector. Image is dark subtracted, bias adjusted, and flat-field in IRIS with final work in Photoshop. As usual the guiding was done by me with the 4.5" guidescope.
You can clearly see the extra HA response with similar exposure time to mine.
Hi Tony,
Yes I agree, the removal of the Standard CMOS filter really lets in a lot of extra Hα.
Have you considered giving ISO200 a go instead of ISO800 that you used?
It is my thoughts that the lower ISO captures more of the nebula than does higher ISO. "Where there is less noise, there is more nebula" - could be wrong but ISO200 seems to be giving me the smoothest results.
Another good Lamda Centauri nebula, gee seems everyones imaging it of late. I can see the Thackarays Globules in there too in amongst the bright stars.
Scott
Another good Lamda Centauri nebula, gee seems everyones imaging it of late. I can see the Thackarays Globules in there too in amongst the bright stars.
Scott
Geeday Scott,
Yeah I think Lambda Centauri Nebula is just in the right spot for imaging, so we are all "after it".
Just for the record the dark globules in the nebula are actually called BOK GLOBULES after their discoverer Astronomer Bart Bok.
Incidentially Bok was director of Mt. Stromlo Observatory for about a decade and he published one the best Astronomy Books that I have ever had called "THE MILKY WAY" published 1974. I purchased it in 1975.
Howdy
Theres even a lecture at an astro gathering called the Bart Bok memorial lecture. On the HST pic they mention a South African astronomer A.D.Thackaray who apparently first spotetd these particular globules, see http://antwrp.gsfc.nasa.gov/apod/ap020108.html
I know ones in the Rosette nebula are referred to as Bok Globules. An AAT pic of IC2944 also refers to them as Bok Globules. http://www.aao.gov.au/images/captions/aat077.html
Scott
Howdy
Theres even a lecture at an astro gathering called the Bart Bok memorial lecture. On the HST pic they mention a South African astronomer A.D.Thackaray who apparently first spotetd these particular globules, see http://antwrp.gsfc.nasa.gov/apod/ap020108.html
I know ones in the Rosette nebula are referred to as Bok Globules. An AAT pic of IC2944 also refers to them as Bok Globules. http://www.aao.gov.au/images/captions/aat077.html
Scott
Hi Scott,
I think what the article at http://antwrp.gsfc.nasa.gov/apod/ap020108.html forgets to say is that Thackeray first spotted these dark globules in IC2944 (in 1950), rather than what the article does say which is first spotted these dark globules.
But Bart Bok first drew attention to them in 1947 - 3 years prior to when Thackeray found them in IC2944. Apparently Bok studied these dark nebulae extensively. After Bok's discovery Thackeray went on to find these dark nebulae in IC2944.
Nevertheless is does seem that Bok Globules and Thackeray Globules are indeed the same objects. Perhaps they should be called Bok-Thackeray Globules. Just for the record I thought Bok and Thackeray Globules were different types of dark globules.
Hi All,
After seeing PAULs picture of this object the other day, and as I had never Imaged it before, I gave it a go last night with the ED80+Canon (a much wider field, approx. 2 Deg.) The good book says this object is 75 arcmin. in size so within my FOV, Im lacking PAULs detail but still cant see the "RunningChicken" which is what they called it, any takers on seeing the RunningChicken ???.
Hi All,
After seeing PAULs picture of this object the other day, and as I had never Imaged it before, I gave it a go last night with the ED80+Canon (a much wider field, approx. 2 Deg.) The good book says this object is 75 arcmin. in size so within my FOV, Im lacking PAULs detail but still cant see the "RunningChicken" which is what they called it, any takers on seeing the RunningChicken ???.
6 x 6 Min. Exp. at ISO 800, DF removed, guided.
cheers..........Jim
Geeday Jim,
Well done of that lovely wide-field image.
I didn't know it was called the RunningChicken Nebula.
Attached is my idea how one makes a runningchicken from it - no laughing please
Howdy.
Regarding the dark blobs, apparently they think they may be in fact evaporating due to the intense radiation from nearby stars, so although in some nebulae they may collapse to form new stars, (egM42) in this case they may grow smaller and evaporate.
Scott
Another fine shot Paul - These Canon digital SLRs really seem to be the business for DSO's - Remember all the neck breaking years of guided film photography!!? Talk about doing the apprenticeship. Don't know about you but I certainly still have a crick in the neck and frost bitten toes from sitting in the cold too long! - Great work mate
Another fine shot Paul - These Canon digital SLRs really seem to be the business for DSO's - Remember all the neck breaking years of guided film photography!!? Talk about doing the apprenticeship. Don't know about you but I certainly still have a crick in the neck and frost bitten toes from sitting in the cold too long! - Great work mate
Geeday Videoguy,
Yes the DSLRs are certainly a lot of bang for buck.
Yes I do remember guided film photography, the frozen toes etc, but I find myself still suffering from those symptoms as I still manually guide my images (it's not autoguided or anything like that).
Nice to hear from you, glad you liked the picture.
