Categories
Wide Field Astrophotography

Halo with parhelia

circular (22 degrees? anyone want to verify that, picture taken with Samsung S4 mini) halo with parhelia at 3 oclock and 9 oclock.

2015-07-25_circular_halo

Categories
Wide Field Astrophotography

Leo and Mars

Wide-field shot of the area around Leo. The bright dot low and right of center is Mars, and I think next to mars is the open cluster M44 (a.k.a. "the beehive cluster" or "Praesepe"). These pictures really need to be taken on nights without the moon. There's a huge gradient from dark to bright towards the direction of the moon.

I tried to add some lines and text for constellations, but it's fairly difficult because so many stars are showing in the picture:

Categories
Wide Field Astrophotography

Ursa Major

3 x 20 min = 60 min exposure of Ursa Major through a 17-40/4L lens at ca 17mm and stopped down to F5.6. There is something funny with the polar-alignment or the guiding which makes the stars in the lower left corner not look good.

Categories
Astronomy Wide Field Astrophotography

North America Nebula (NGC7000)

ngc7000

After M31, and before the clouds started rolling in, I pointed my camera at the North America Nebula NGC7000 right beside Deneb (the bright star low/right).

A single 10 minute exposure at iso400, 70-200/4L lens set to 200mm and F5.6.

Categories
Astronomy Wide Field Astrophotography

Ursa Major

17mm F/5.6 lens, 6x10min exposure at iso800

Categories
Astronomy Wide Field Astrophotography

Cassiopeia

17-40/4L lens set to 17mm and F/5.6. A stack of 20 exposures, each 60s (20min total exposure at iso800). See also here.


Categories
Wide Field Astrophotography

Cygnus

A 32 minute exposure at iso200 through a Canon 17-40/4L (17mm @ F/5.6) of Cygnus and surrouding constellations with the milky way in the background.

There is a tree at the bottom right, and some local light-pollution bottom left, otherwise I am quite happy with this first serious go at a wide-field milky way picture. A dew-heater will allow longer uninterrupted sessions, and the fine focus could be improved slightly. Perhaps I should use a higher iso setting?

Update: after some discussion it seems that the red problems in the lower left corner may be due to amplifier-noise in the camera. Stacking a number of shorter exposures, for example 6x 10 min, is a better way of achieving a long total exposure with a DSLR. Cooled CCD cameras made for astrophotography are better for very long exposures - but also cost significantly more than consumer DSLRs.