|Nikon D70 - Sun images|
|In preparation to the Venus transit, I tested the D70 for Sun imaging.|
|The instrumental configuration|
|I tested Sun imaging with 2 differents configuration:
- With a 180mm Nikon lens and a Mylar filter
- With a refractor of 70mm diameter, 400mm of focal, a perl Halley 70
In both case, I used the Nikon Capture Software to store the images directly to the PC. As the exposure are not "Bulb exposure", Nikon Software is useable. I used the remote IR command (palm with Omniremote) to avoid vibrations. See more on Nikon D70 camera here.
The observatory is quite unusual here as it is in Paris downtown - with just one hour frame for observation as the sun goes on top of the street.
The sun image processing
No dark, no offset, no flat... maybe not the best way to do. I select the best image and convert it inton r,g,b, images. I then pick only the green one and convert it from 48bits to 16bits to get a Black and White image. I then apply an unsharp mask with IRIS of 1.5 - 2
With the 180mm lens - 18th of May 2004, 12:46 TU
With the 70/400 Perl Halley refractor - May 29th 2004, 08:14 TU
More to come with the Venus transit from Iran !!!