How To: Focus In The Dark by using daytime to find infinite

Описание: Hey everyone, thanks for watching and I hope this easy tips helps you get better shots at night. The great thing about knowing your infinity focus point may also help you with long exposures if you are using a 9 or 10 stop filter which is impossible to focus through. Also if you are shooting a wide angle landscape directly into the sun and your camera lens is hunting for a focus point, knowing your infinity location ahead of time will save you from some blurry images!
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Written Instructions: Grab your camera and the lenses you want to use at night and take them outside during the day. I like to set them up on a tripod for the best accuracy. Use manual or aperture priority mode and set your lens at its widest aperture since at night you will be using this F stop number. For example, the sigma 15mm fisheye lens I am using is F2.8.
Now use your camera's auto-focus to focus on something in the far distance to help you find that lens’s infinity point. Many times the infinity point on the lens focus ring is inaccurate and cheaper lenses don’t have infinity marks at all. Zoom in on your screen as far as the camera can allow and manually rotate your focus ring. When the image on your live view screen is as sharp as it can possibly be you can mark off your infinity spot on the focus ring. I like to use a silver sharpie marker on black lenses since its the easiest to read. Some lenses like the Nikon 14-24 you will be unable to mark out the sharpest infinity spot however just take a picture on your phone and reference it later at night.