I have been quite frustrated with small gaps appearing in star trails created with many short exposure blended with the Lighten blending mode. Thanks to Floris van Breugel's article and his
LSB Algorithm I managed to close these. Thanks Floris!

There were still some unexplainable gaps, which I had to close manually with the clone tool though.
Quiver Tree Forest, Namibia
Camera Model Canon EOS-1D Mark IV
Aperture Value f/2.8
ISO Speed 100
Lens EF16-35mm f/2.8L II USM @ 16mm
64 frames of 5 minutes blended
Natural (moon) light (I started the exposures just about 15 minutes before moon set in the middle of the night)
Comments
16 commentsIt was probably quite warm out, but I should mention I find that noise and/or dead pixels present no problem at all with 4-5 hour single exposures on my 5D II or 1Ds III if the ambient air temperature is in the 0-5 Celsius range. Below that batteries die to quick and above that the sensor heats up too much resulting in dead pixels. The effect derived from a single exposure results in much less work and more subdued star trails, like you'd get with film.
Not to hijack the thread or anything, but I've included a crop to illustrate what I'm saying. Attached is a 100% crop from a 4.5 hour SINGLE exposure with the 1Ds III. The air temperature was roughly 0 degrees Celsius throughout. The image was shot with the Canon 1Ds III, Nikon 14-24, ISO 100 and exposed as far to the right as possible before being darkened in processing. There was no noise reduction applied and the image has extremely little noise and dead pixels. In fact, you'd get more dead pixels with an improperly exposed 1-minute exposure at the same ISO! It is not sharpened or otherwise altered for web. Exposing to the right is very important, as is battery life. 4.5 hours is about the max for one battery in those temps on the 1Ds III.
Maybe if there had been only one tree in the frame it would work better for me. Or if the star trails had been more subtle. Still, it's an incredible image with a great deal of energy and 'pop'.
aF
p.s. per marc and tech info. was your long exposure noise reduction on for the 4.5 hr shot?
*You don't need to do 4.5 hours to get trails nor do you need to do 5k exposures. Part of it really depends on the focal length, the wider the longer the exposure time and the more you are zoomed in the less exposure time you'll need. If you are zoomed it at 100mm you can acheive fantastic trails in only 15 minutes, not every shot needs to have the full circle in the image. Personally the more you do it the more it lessens the powerful effect of the image so I'd keep it down to a few or just one of your favorites in your portfolio and this is definitely worthy. The sidelighting on the tree counterbalanced tree stands out well enough. There are so many
OPTIONS with night photography it's best to keep an open mind with it and limit oneself.
I am not normally a fan of star trails. For my taste I have only seen maybe 3 images that worked for me. This is one! It is so dynamic, the scene looks absolutely magical. Those trees are incredible and work great with the star trails. Did you capture this comp with the stars as pin points as well? Just curious, I would imagine the trails to be more spectacular though.
Very cool image!
Shane
Gary.