Tag Archives: h-alpha

Solar imaging – 16/2/16 (+ something unexpected)

As I have been very busy trying to make the most of all the opportunities to do imaging, I have not had the time to process these until now. It can be predicted that the clear skies will not last in England, and hence it is good to have things to process on those days when it is not possible to do imaging. Here are the solar images I managed to capture last week, including a surprise. Continue reading Solar imaging – 16/2/16 (+ something unexpected)

Rosette nebula – Samyang 135mm F2 + narrow band filters

On Valentine’s day I did post a picture of the Rosette nebula. What I did not tell you was that it was imaged using the Samyang 135mm F2 lens and my Astronomik narrowband filters (specifically H-alpha and O-III). That final photo was a result of 5 x 5min H-alpha images making up the red channel and 14 x 5min O-III images making up both the blue and green channels. I used the gain setting of 100 (19% gain) on the ZWO ASI178MM-cooled, and sensor temperature at -25 degrees celsius. Continue reading Rosette nebula – Samyang 135mm F2 + narrow band filters

Astronomik Narrowband Filters

A while back, I had acquired the Samyang 135mm F2 lens in Canon EOS mount for astrophotography, as it was available at a very good price. As this lens is very sharp even wide open, I felt I had to get the most out of it and consider narrowband imaging. While researching the filter choice, I had narrowed it down to either the Baader narrowband F2 filters or the Astronomik set (H-alpha, SII and OIII) in 1.25″. But I decided to go down the Astronomik route as this has always been the brand of astronomy filters I’ve used (other than the Baader U and UV/IR cut). Continue reading Astronomik Narrowband Filters

Solar H-alpha imaging – ZWO ASI178MM-cooled (update)

Since the last attempt at solar H-alpha imaging with the Daystar Quark and ZWO ASI178MM-cooled, I have been looking for the opportunity again to image the sun. I had previously encountered Newton rings, suggesting that the camera was not aligned properly with the Daystar Quark. So there were a few things I wanted to try. Sunday 7/2/16 gave me the perfect opportunity, as the skies cleared long enough for me to do some imaging. And the sun had many features to image as well. Continue reading Solar H-alpha imaging – ZWO ASI178MM-cooled (update)