2016 August 5 ~ Bright diffuse Nebulae in Serpens & Sagittarius

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Photographed at Algonquin Provincial Park, Ontario, Canada, between 22.58 and 23.09 EDT

(285 km by road north of Toronto)

* Temperature 17° C.

 

* Total exposure time: 6 minutes.

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Description:

 

The centre of our home galaxy, the Milky Way, lies in the constellation Sagittarius, which in the northern hemisphere summer lies low in the south at midnight.

 

In this view appear many favourite targets of amateur astronomers with modest telescopes, including the large glowing Lagoon Nebula at the lower right.

 

For a version of this photo WITH LABELS, click on your screen to the RIGHT of the photo, or click here:

www.flickr.com/photos/97587627@N06/28589630170

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Technical information:

 

Nikkor AF-S 70 - 200 mm f/2.8 G ED VRII lens on Nikon D810a camera body, mounted on Astrophysics 1100GTO equatorial mount with a Kirk Enterprises ball head

 

Six stacked frames; each frame:

135 mm focal length

ISO 4000; 1 minute exposure at f/4.5; unguided

(with LENR - long exposure noise reduction)

 

Subframes registered in RegiStar;

Stacked and processed in Photoshop CS6 (brightness, contrast, levels, colour balance, colour desaturation)

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Done