Tag Archives: OIII

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