canon 70 200

flickr

Untitled by Jonathan Wintle

flickr

San Francisco by Chris Gurinsky
Via Flickr:
Chris Gurinsky

Messier 45 The Pleiades. This was 92 minutes from Bel Air Maryland. I snapped 23 four minute exposures at ISO 400, 200mm, f/3.5 and No light pollution filter. Stacked in Deep Sky Stacker and edited in Adobe Lightroom and Adobe Photoshop. At 200mm focal length the cluster is quite small, so this has been considerably cropped. I chose this focal length because it enabled me to shoot at f3.5 which would give me over 8x as much data in the same amount of time. My alternative would have been 400mm @ f8. Not only would the lens pass ½ as much light though at f8, but it would also be spreading the nebula out over 4 times as many pixels. Thus resulting in 8x less light hitting each photo diode on the camera sensor. Now to my advantage I had great weather this night. It was party to mostly cloudy all over Maryland and for whatever reason, the entire time I was imaging I was under a hole in the clouds giving me exceptionally darker skies since the clouds everywhere else were holding down the light pollution. I did not use dark, bias, or flat frames to create this. 

The Pleiades is an open star cluster containing middle-aged hot B-type stars located in the constellation of Taurus. It is among the nearest star clusters to Earth and is the cluster most obvious to the naked eye in the night sky.

flickr
flickr

Uppsala, January 18, 2014 by Ulf Bodin
Via Flickr:
X17264

My current camera/lens set up

My question box is filled with questions about what camera/lens I use so I’ll use this to answer them all at once.

Camera body: Canon 5D Mark III
Lenses: Canon 16-35 f2.8L II Canon 24-70 f2.8L II
Sigma 35mm f1.4 Art
Canon 50mm f1.2L
Canon 70-200 f2.8L IS II

flickr

Comet Lovejoy Q2 by henry-67
Via Flickr:
Elaborazione della Lovejoy Q2 in 16/9 Processing Lovejoy Q2 16/09

flickr

African Spoonbill by Bob Worthington