Deep Lagoon, Triffid in HA

[tornado33]

Hi
I used the 300mm lens from Bert, and the Baader 7 Nm HA filter to image this area under a fairly dark sky (for Newcastle)
7x 10 mins ISO 800, 300mm f2.8 flourite lens

Full size version here (http://d1355990.i49.quadrahosting.com.au/Scott/lagoontriff7x10minsiso800hamod350d3 00mmf2smstbig.jpg)

Using just the red channel gave an image with saturated inner areas of the nebulas, so I used the green channel as an unsharp mask, preserving inner detail and keeping the faint extended stuff
Scott

[dpastern]

Yummy shot Scott - there's something about HA mono shots that I find so appealing. What sort of camera? I'm impressed at how much detail you've pulled in given the subs.

Dave

[tornado33]

Thanks. I use a Hutech modded Canon 350D, with the clear AR coated glass option. For the shot I also used a UV IR filter to stop unwanted IR light that might sneak past the HA filter.
Scott

[dpastern]

That's very nice for a modded camera. I can't justify doing that to my 1D Mark IIn, since I use it for (mostly) terrestial photography, but I do have an older Canon D60...mmm

Dave

[AlexN]

Scott, Great image! Gotta love the beautifully corrected field of view given by the old 300mm F/2.8L.. Still haven't used mine for astro imaging.. Cant bring myself to expose it to the elements like that just yet! :D

It looks very clean and detailed for such short exposure... I recently did 18x1200sec subs in 7nm Ha with my refractor/CCD and the image didn't come out quite that noise free.. Mind you, I was operating at F/6, where as you're at 2.8... you'll suck down the data faster than I did...

Top work.. Exactly what I've come to expect from you..

[tornado33]

Many thanks all. All the hydrogen nebulae in the milky way are getting a bit now in the west now, so I should concentrate on doing some HA stuff in the magellanic clouds and the Orion area.
Scott

[multiweb]

Love it! Very deep. One of the best Ha shot I've seen of the area. :thumbsup:

[Phil Hart]

great shot.. interesting process technique too.. will have to give that a try sometime :-)

[seeker372011]

very pretty shot scott

[supernova1965]

Please can someone explain what HA means

[multiweb]

Hydrogen Alpha. A filter that let's in only a very narrow band of light around 650nm.

[gregbradley]

That's a fantastic Ha image and puts to rest any idea that narrowband images are out of reach of modded DSLRs.

Greg.

[strongmanmike]

Deffinitely agree with Greg here, nice job Scott :clap:

Mike

[supernova1965]

Thanks for the explanation. I love to learn new stuff:thumbsup:

[h0ughy]

great work Scott

[tornado33]

Thanks all.
The filter is an unmounted 2 inch one, that fits in at the rear of the lens. Of course once in place nothing can be seen in viewfilder so before fitting it I line the camera up on a bright star, then adjust the guidescope's 8x50 finderscope on same star, and use that to point the camera, short 5 second test images at ISO 1600 reveal the framing. I always have the laptop plugged in so as soon as an images is taken it downloads it to the laptop where I can examine it for framing and focus.
Scott