Composite transit of Venus sequence

Posted by Cygnusx15
on Saturday, July 7, 2012

This is a composite of 10 photographs and a photoshop overlay of 12 additional pictures from a set of 240+ pictures..  The Camera Used was a Nilkon D700 14.2 MPixel Camera, which was mounted on a declination/right ascension drive to track the sun in constant sidereal rates and celestial coordinates.

The Camera Employed an 11 stop Neutral density filter set on a 150-400 MM F29 Zoom lens set to 400 mm. For the last 1/2 hour when the atmosphere was thick, the filters were reduced to 8 stop.  Typical exposures were

1/8000, F29, 400MM, 11 stop near the beginning of the seqence. The sunset pictures used an 8 stop filter and the exposure/F-stop was 1/400, F-10. ISO 200 was used throughout.

The venus composite (incomplete because of the sun set prior to the end of the transit) was created by aligning stacked images by the sunspot locations and removing the rest of the stacked solar image except the planet overlay. The overlay is probably accurate to +/- 1/8 planet diameter. The final sunset picture on the bottom right has also been rotated to local horizon coordinates. I hope you like the picture.

Location was the Starfire Optical Range area, Kirtland AFB, Albuquerque, NM using personally owned equipment. 

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