Another h-alpha lagoon...

[Peter Ward]

Greg's image of the Lagoon caught my interest as I imaged it a few weeks ago with the same sensor, though a much smaller scope.

I didn't have the time for a marathon effort.... just 20 minutes infact.

What surprised me was the S/N is still pretty good, despite way less photons coming down the pipe.

I've posted the image in HD res, so yo'all can have a good look :)

The link is here. (http://www.atscope.com.au/BRO/gallery107.html)

[multiweb]

Nice contrast - cool. :thumbsup:

[Paul Haese]

Lovely field of view. Some minor noise present but with only 20 minutes of data I am impressed with the minimal amount of noise. I think I prefer this field of view over Greg's and your previous version too.

[Peter Ward]

Thanks Marc, Paul.

Just to be clear, I'm not trying to take any wind out of Greg's CDK sails....but I agree, many objects are sensitive to how they are framed, which usually means a different focal length and aperture to capture varying objects in their entirety (though high quality extenders or reducers can indeed make a single scope very versatile)

Smaller apertures are hardly fatal with CCD's....you just have to take longer exposures, but it seems, not that much longer! :)

[Paul Haese]

Know what your saying mate. TSA, needs looonnng exposures. Still does a great job for a 4" though.

[gregbradley]

Surprisingly similar given the aperture and exposure difference.

Refractor FOV is still a very appealling view for many objects.

A very nice image.

Greg.

[marco]

Agree with Greg, surprising result for such a short exposure and "small" aperture. Your camera seems to work very well too with very low noise..

Clear Skies
Marco

[Peter Ward]

Thanks Marco. By the way... your deep sky work is simply excellent :thumbsup:



Yes, it's a remarkable level of detail given the exposure time. Then again the AP155 is probably the best 6" refractor ever made IMHO, so I guess I shouldn't have been surprised! :)

[jase]

A very clean image Peter. Well done.