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X-T100 /Rokinon 12mm focus

Started Feb 4, 2020 | Discussions thread
davidnbb Regular Member • Posts: 168
Re: X-T100 /Rokinon 12mm focus
2

In most circumstances, you don't need to focus it at all. What you need to know is the hyper-focal distance of the lens. With the Samyang, that's 3m. So assuming you're not using it wide open, from f4 or so that means everything from about 40cm or so to infinity will be in focus.

So go outside and measure out a distance of exactly 3m from a strongly-defined object (with clear edges). Then stand at the 3m mark and carefully focus the lens on the object (use peeking). Physically mark this point on the focus ring of the lens (where it lines up with the tiny white dot on the red ring). I used a white marker pen to make a dot on the focus ring,

After doing this, you'll almost never have to worry about focus - just line up the two dots and set the lens to f5.6. (obviousness this doesn't apply if you doing astro or whatever).

You may also find that the rear lens cap is loose and keeps falling off. Solution is to use a little piece of electrical tape about 1cm wide (stick it on the flat part of the mount and bend it up and round the barrel about 5mm to secure it. Not pretty, but it really works (if you use red tape, it would probably look intentional). This has no effect on mounting or demounting the lens, but it does keep the rear cap in place.

My flickr

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