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Showing posts with label corona. Show all posts
Showing posts with label corona. Show all posts

Saturday, September 02, 2017

Eclipse HDR and Earthshine

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 HDR combine was obtained with my Canon 70D attached to my 70-200mm lens at 200mm focal length.  The exposures were made at ISO 200, f/8, and 1/500 seconds, 1/125 sec, 1/30 sec, 1/8 sec, and 1/2 sec.  You can see the dark blue sky along with the bright star Regulus to the left of the Eclipsed Sun.

This image is the same as the previous one but with some contrast stretching of the Earthshine on the dark face of the Moon.

Wide field Total Eclipse shots

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.






Tuesday, August 29, 2017

August 21, 2017 total eclipse

During the total solar eclipse on 2017 August 21, I shot a sequence of 5 exposures, each 2 stops from its neighbor, in order to get reasonable exposures on prominences on the bright end the solar corona on the fainter end.  In this case, I used my Canon 6D with a 0.7x focal reducer on my f/10 Celestron EdgeHD 8 inch telescope with exposures of 1/500 sec, 1/125 sec, 1/30 sec, 1/8 sec, and 1/2 seconds going down the images below.  These images were taken early in the eclipse so that the Sun's photosphere is just covered by the Moon on the east (left) side while the west (right) side is well covered by the Moon.