another good lens from SamYang/Walimex/Rokinon

sharp; contrasty; nice format this is a very good Ultra Wide and much better than Sigma 10 20 at 10mm It is also better than Sigma 8 16 at 10mm (but Sigma is also very very good

like every SY distance scale needs to be calibrated with Live View/ Contrast detect; but after that has been done...perfect

I purchased this specifically for astrophotography as it provided a large aperture. As auto-focus doesn't work when focusing on stars, the lack of it on this lens is not an issue for me.