Around midday today, I noticed that the sun was shining through with patches of clear sky. Hence I thought I would do some more solar imaging. And I was richly rewarded, as the seeing was very good indeed. Today it was very easy to tell when the sunspots are in perfect focus.
I read recently about the sunspot named AR2192, which is supposed to have unleashed an X-class (large) solar flare recently. Unfortunately the skies have been cloudy all of last week, and hence there has not been an opportunity to image the sun. With forecast for clear skies on Sunday, I was hoping to finally have a chance to image AR2192. Continue reading Solar imaging 19/10/14
There is a solar tracking mode on the Astrotrac TT-320X which will make solar imaging much easier. This is activated by pressing the brightness button while powering up i.e. plugging in the external battery pack. Then the Astrotrac is activated for tracking by pressing the play button – once to start the initialisation process and then a second time to start tracking. Continue reading Astrotrac TT320X – solar imaging
For this post, I would like to compare the difference in images between the use of a single Solar continuum and double-stacking. In my previous test, I did not find that much difference between those images with and without IR, hence I wanted to know if there was any benefit from using a double-stack of Baader Solar continuum (as I have two of these filters in 2″). Continue reading Baader Herschel Prism – single vs double stacked Solar continuum
For this test, I have taken images with two different cameras. I have used the full-spectrum Olympus E-PL5 with the Baader Solar continuum and ND 3.0 filter for the images without IR-blocking, and the unmodded Olympus E-P5 with these two filters for the system with IR-cut. The question is whether there is any detectable difference between the images taken. Continue reading Baader Herschel prism – Solar continuum with and without IR-cut
I had borrowed my friend’s William Optics Megrez 72mm Apochromatic refractor for astrophotography, although not had a chance to use it. This telescope is paired with the Astrotrac TT-320-TX AG to correct for the earth’s rotation while imaging. This setup is mounted on my Manfrotto 075 tripod. This 72mm F6 telescope has a focal length of 430mm (or 860mm effective focal length on the Micro 4/3rds system). As I had used the Skywatcher ED80 for solar and moon imaging, I decided to see if there was any benefit from using this apochromatic refractor. Continue reading William Optics Megrez 72 APO – solar & moon imaging
I own a Skywatcher ED80 refractor, which is an 80mm F7.5 telescope with a focal length of 600mm; effective focal length is 1200mm on the Micro 4/3rds system. I bought this as a guide scope for my main astrophotography system. But I normally use this telescope for solar or moon imaging, as it is very easy to set up. Continue reading Skywatcher ED80 – solar and bird imaging