Saturday, January 06, 2018
Thursday, January 04, 2018
Wednesday, November 22, 2017
|Kitt Peak in the distance|
|Gates Pass to Golden Gate Mountain|
|Saguaro Cactus and pretty sunset clouds|
|Saguaro Cactus, sunset clouds and the Moon|
Thursday, October 12, 2017
Sunday, October 01, 2017
I recently installed the Aurora 2018 HDR software on my PC and here are a couple different HDR combines which greatly enhance the detail in the solar corona as well as helping to bring out the detail in the Earthshine-lit lunar surface in some HDR exposed images of the August 21, 2017 total solar eclipse. The HDR combines use 5 images taken at 2 stop intervals from 1/500 seconds to 1/2 seconds using my Canon 6D with a 0.7x focal reducer on my 8 inch EdgeHD telescope. The images were taken about 25 seconds before the end of totality when the prominences on the western side of the Sun were mostly uncovered by the Moon. Once I learn how to use Aurora, I might be dangerous in taking HDR images!
Tuesday, September 05, 2017
Saturday, September 02, 2017
My eclipse photography plan during totality was to take a sequence of images with exposures tailored to see both the bright prominences and the faint outer corona, so my exposures were a set of 5 images every 5 seconds at ISO 200, f/7 (on my EdgeHD C8 with my Canon 6D and a 0.7x focal reducer) with exposures of 1/500 sec, 1/125 sec, 1/30 sec, 1/8 sec, and 1/2 second. I used the same exposures on my Canon 70D with my 70-200mm lens at f/8. Here are the result of some HDR combines using Picturenaut and then some touchup with the GIMP.
|This is an HDR combine of 5 images taken with my Canon 6D attached to my Celestron EdgeHD C8 using a 0.7x focal reducer.|
|This is the same image as above but with some contrast stretching to bring out the Earthshine on the Moon. I was hoping I'd be able to see it in the longest exposure of the sequence.|
|This image is the same as the previous one but with some contrast stretching of the Earthshine on the dark face of the Moon.|
After seeing the August 21, 2017 Total Solar Eclipse, we headed for Mount St. Helens, the volcano in southwestern Washington that produced the largest volcanic eruption of the 20th century and the largest landslide recorded in history on May 18, 1980. The eruption killed 57 victims as the north side of the mountain collapsed and blew out. The landslide devistated a huge area mostly north of the volcano and an ash cloud rose to more than 7 miles, covering a huge area to the northeast of the mountain as the volcano lost 1313 feet from it's height. The appearance of the formerly symmetric volcano was changed in minutes to a large horseshoe shape and over the next 6 years, a volcanic dome grew inside the crater atop the volcano. Activity is greatly reduced but continues off and on, adding to the volcanic dome complex near the summit.
|This closeup of the summit of Mount St. Helens is the first of 3 images showing the horseshoe shaped summit left over from the eruption. The clouds surround the summit area, especially the lava dome which grew after the eruption.|
|This second image shows the lava dome a little better. You can see a vertical column of steam rising from the vent.|
|Here is a closer view of the lava dome and the steam vent on its summit.|
|As we drove out of the park, we watched a pretty sunset over the mountain.|
|The magic hour around sunset produces some spectacular lighting and this day was no exception to that.|
The following images were taken midway through totality using my Canon 70D with my 70-200mm lens. The images used a 2 stop bracket with mid exposure of 1/30 seconds at f/8, ISO 200 and 5 total shots. The images were taken in just over 1 second and I took a set every 5 seconds. You can see prominences in the first image and increasing corona details as the exposures increase. The final image also shows Regulus to the left of the Sun/Moon.