Once centred and magnified, you can begin to refine the focus.Ĥ) As you adjust the focus ring, the aim is to make the star as small as possible. You may need to reposition the star to the centre of the view when you do this using your camera’s arrow keys. Setting the lens to infinity will bring you into the correct range for focusing on stars, and only small refinements will be needed from here.Ģ) With the live view feature enabled, move your mount to find and centre a bright star.ģ) Once centred, use the digital zoom feature, which will enlarge a small area of your live image to either x5 or x10 magnification. To achieve pin-point star focus, follow these easy steps:ġ) Set the focus ring at infinity and set the aperture setting wide open, i.e. The magnificent Andromeda Galaxy (M31) is a great first target for the Samyang lens, by Mike Soulby ©
This ED element ensures that light at both the red and blue ends of the spectrum come into focus together, minimising chromatic aberration, keeping the bright stars in your images free from distracting colour fringing.Įvery lens element has had an anti-reflection coating applied to both sides. The lens contains one element of Extra-low Dispersion (ED) glass. Below is the optical arrangement of the lens elements.
Inside the lens are 11 lens elements arranged in 7 groups, all working together to produce a sharp, flat field with minimal distortion, critical for creating high-quality astro-images.
The Samyang 135mm f/2 is a fully manual prime lens, but don’t be put off by the lack of auto-focus or the manual aperture setting astrophotography does not require these features to be automated.