california nebula

mymoon · Post by **mymoon** » Tue Jan 19, 2010 10:12 pm

California Nebula (NGC1499) is a large emission nebula in Perseus.It is so difficult to observe visually. But we can take a photograph of it easily. [smilie=admire2.gif]

Camera:Canon 40Dh
Lense :Canon 200mm @ f2.8
Mount :HEQ5 pro
Guider :80mm ED with TVGuider Autoguiding
Photon Details: Lights 11X180sec
Darks 3X180sec

Align and stack in DSS and post process in PS2

Comments and advise welcome.

cheers

guangwei · Post by **guangwei** » Tue Jan 19, 2010 10:28 pm

superb!

wintertriangle22 · Post by **wintertriangle22** » Wed Jan 20, 2010 9:52 am

Excellent photo of california emission nebula, emitting light in the red part
of the spectrum much like a plasma globe streamers [smilie=good-job.gif]

antares2063 · Post by **antares2063** » Wed Jan 20, 2010 4:01 pm

i didnt know a 70-200/2.8 lens can take Deep sky objects

may i know what is the mean of lights 11x180? 11 frames at 180secs each ? and also what is darks?

mymoon · Post by **mymoon** » Wed Jan 20, 2010 5:12 pm

antares2063 wrote:i didnt know a 70-200/2.8 lens can take Deep sky objects

may i know what is the mean of lights 11x180? 11 frames at 180secs each ? and also what is darks?

Initially neither do I. From my wild bird photography days I have over the years collect quite a number of fast lenses and supertelephotos . It would be a shame to sell them at a discount and buy telescopes when their purpose is similar.

So armed with many DSLR bodies and lenses I trawl the web and found

1. here

2. here

3. here

Another advantage is the Auto Focus. I usually AF on the brightest star and slew to object of interest. However Live view focussing has somewhat reduce this benefit.

So for objects which requires focal lengths of up to 1000mm I use camera lenses otherwise I use a C8 . ED80 and equinox 66 telescopes are my autoguider scopes.

Off course Remus will tell you I cannot do CCD astrophotography [smilie=blocked.gif]

BTW Canon has a zoom 70-200mm f2.8 and also a 200mm f2.8 prime. Both are equally good.

For Lights and Darks etc click here . I cannot explain better.

Yes 11X180sec do mean 11 frames each at 180 sec.

cheers

mymoon · Post by **mymoon** » Wed Jan 20, 2010 5:15 pm

guangwei wrote:superb!

Thanks.

wintertriangle22 wrote:Excellent photo of california emission nebula, emitting light in the red part
of the spectrum much like a plasma globe streamers

Thank you.

cheers

Post by **Airconvent** » Wed Jan 20, 2010 7:52 pm

Good effort mymoon! [smilie=admire.gif]