Tag Archives: Samyang 135mm f2

ZWO ASI1600MM-cool + Samyang 135mm F2.0 – daytime test

As the skies are cloudy and my new telescope mount is still not fixed onto the telescope pier – because I still need to work on the adapter for it, I thought I would try the ZWO ASI1600MM-cool with the Samyang 135mm F2.0 in daylight to answer a few further questions I had. Continue reading ZWO ASI1600MM-cool + Samyang 135mm F2.0 – daytime test

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

Samyang 135mm F2.0 Lens (EOS mount)

Now recently I was looking for a fast focal ratio lens for astrophotography, as it would be great to be able to image at F/2.0-2.8. As the ZWO ASI178MM-cooled has a crop factor of 4.8x, it would mean a 135mm focal length lens would be ~650mm, and a 200mm focal length lens would function at ~960mm. Hence I had bought the Samyang 135mm F/2.0 lens in Canon EOS mount for this purpose. Continue reading Samyang 135mm F2.0 Lens (EOS mount)