![]() Thanks everyone as a lot of great information. Wish that it was at least marked correctly for 15☌ or something (reasonable?) like that. If I remember correctly it has something to do with tolerances and temperature changes, it seems quite far off though. It doesn't seem like a defect, it feels intentional. I got my copy last night, indeed that you have to place it in the middle of the marker and not at the end of the focus throw. Used to be able to eyeball it, now it's been so long I can't even recall. If I remember correctly it's in the middle of the horizontal bar near the infinity marking on my copy. I know that my old Pentax 50/1.8 from my film days did not have this issue. The Rokinon is the only manual lens I have so I don't know if this is a common occurrence with manual lenses. I used tape to keep the focus ring at the infinity setting before venturing out into the dark. It is almost definitely not at the infinity marking on the focus dial. Prior to use for night skies, test to identify the focus ring setting for infinity. I didn't need either, but to each his own. The 16 is a terrific lens, if you need autofocus and a 16mm prime lens. ![]() Unlike the 16, I find it worth to change lenses and use it in other scenarios where 18 isn't enough Sometimes I shoot pano with it, this is a 6 pictures panorama: Very rarely you need to focus closer with a 12mm, you just set it to f8 during the day and f2 for astro. One can use paper tape to mark infinity exactly, and you can focus it before you even put it on the camera. If i move it accidentaly, I can quickly use the markings to set it again. On the Samy, I set infinite focus during the day and leave it like that, and I'm good forever. Every time I handled the camera (I use a tripod with a ball head for hiking), somehow the focus ring touched something and I often lost focus, then had to find infinite focus again. The resistance on the ring is non-existant, and the focus ring is huge. The 16 is focus by wire when you turn the focus ring, the focus motor is changing and holding focus, and as it's "digital" sometimes it's a little unpredictable. You can't use autofocus in astral photography, it's got to be necessarily manual focus.
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