Super sharp lens, great focal length, well built with all the manual controls.

I've been using this wide angle lens for a little over a month. Sharp images and its also great for astrophotography! I love this lens and glad that I bought it.

I’ve been using his about a month now and am very impressed. I was looking for a multipurpose wide angle for Astro photography that would also be useful for landscape and am very happy with this lens. 20mm is a good sweet spot between the ultra wide 14 and the somewhat 24mm. This lens does outperform the 24mm gm in terms of sharpness. Distortion is minimal, handles flare very well and little to no fringing. Perfect lens for 2 prime lens backcountry travel. This and the 55 1.8 is an extremely lightweight and compact combo.... Read More  Hide

This was recommended to me by several people for astrophotography and it does not disappoint. Its 1.8 aperture allows so much light and makes focusing on stars so much easier. Very little coma.