First Solar Image

I recently purchased a Thousand Oaks Optical White Light R-G Filter in preparation for the May 20, 2012 Annular Eclipse.  Above is my first attempt at "Solar Imaging".   I was pretty happy with the results and hope to post more pictures of our nearest star over the next few months.  It should be fun since the sun is heading into a more active period.

The above picture was taken during a "dry run" in preparation of the annular eclipse on May 20th.  I used a Nikon D300s (Prime Focus) with an LX90 (Classic) Telescope.

A few things learned from this dry run were:

1) Needed to review telescope tracking and figure out how to initialize my telescope in a daytime setting.  I think I have resolved this issue by just approximating true north (get the telescope in home position) and doing an (autostar) easy align without looking at the guide stars to ensure they are in centered (just hit enter).  I then target the sun and let it track (using keypad, direction arrows).  With this approximation, it is calibrated well enough to keep the sun in the eyepiece for 5-10 minutes before an adjustment is needed.  Close enough for the sun!  In the future, I will look to optimize daytime calibration for better results.

2) I was able to take a variety of exposures and settled on some settings I know will work for the sun.  ISO 200 and exposures between 1/640 to 1/250 will work best.

3) Focusing may be the most difficult.  I found that using the sunspots may be the most effective way to focus the image. Using the outer edges of the sun to focus does not yield positive results.  Sunspots have a lighter outer section called the penumbra, and a darker middle region named the umbra. When the lighter details of the penumbra become visible in my camera view finder sharpen up, I stop.....  It is really hard to see detail through your view finder so I'm constantly adjusting focus and shooting......   You can always throw away the worst of the lot.  Taking lots of frames over a short period of time is also required to get that "clear" patch of sky.

4) Overall picture quality will go down when the sun starts nearing about 30 degrees from the horizon.

5) Mirror lock up before the image is not as critical as when taking pictures of the night sky.

6) For now single exposures seem to be sufficient.  I will work on multiple frames and stacking later when I get other kinks worked out.

7) Will need to get a focal reducer to capture the "entire" sun in one image!

8) Its a lot warmer to observe in the middle of the day or late afternoon.  I'm used to chilly nighttime high desert temperatures.

BRING ON THE ECLIPSE...............

WORD OF CAUTION:  Do not observe the sun through ANY optical aid unless it is properly filtered.  Sunglasses do not count!