David's Images of the Day Photoblog
Backyard Summertime Night Sky Over New Jersey.
I used the images taken overnight to create a time-lapse video of the night sky. Although faint, you can see the Milky Way in New Jersey. The time-lapse video was created using Adobe PhotoShop CS5 and Adobe Premiere Pro CS5.
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Star Trails and Lens Distortion. One problem I had with the star trail image I just published was that the circles looking toward the north star were not exactly round. This is probably due to the non-linear distortions characteristics of wide-angle lenses, especially toward the edges. There is a program, DxO Optics Pro that corrects for distortion of various cameras and lenses. (Note that the current version of Adobe Camera Raw also does lens corrections for some camera/lens pairs, but not for the Nikon D3s camera and 24 mm f/1.4G lens used for this image). I used the DxO Optics program to process and correct the 328 images. It took over 12 hours for DxO to process all of these images.I then ran the reprocessed images with startrails.exe program. Let me know (comment, or send me an e-mail) if you think the resultant image looks better, no different, or worse.
Going from sunspots to startrails. The view is from my back deck over the roof. A tree in my front yard just blocks the north star. The image is a composite of 326 30-second exposures combined using the Startrails program. There are at least four jet trails, and a couple of meteor trails. The meteor trails are too faint in the composite, so I included a crop from a single image showing a meteor trail. I’ve also added a version of the startrails in B&W, converted using Nik Silver Efex Pro 2.
Multi-Exposure Waxing Gibbous Moon — Going Up, Going Down. A ten exposure image of the waxing gibbous moon going up or down using the in camera multi-exposure function. The exposure times were varied in 1/3 EV increments (1/1000, 1/800, 1/640, 1/500, 1/400, 1/320, 1/250, 1/200, 1/160, 1/125, second). The exposures were taken every 30 seconds and used mirror up to minimize camera/lens vibration.
Waxing gibbous moon with 100% illumination (data from the US Naval Observatory site). The full moon is on the 15th. This month the full moon is known as the “Thunder Moon”. Image taken just after midnight with a Nikon D3s camera and Questar 3.5″ telescope (ISO 1600, ~1500 mm, f/16, 1/1000 sec). Raw image processed with Capture One Pro and Photoshop CS5.
