Watching Over

by Vian Esterhuizen

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You'll need to calibrate the positioning of your focusing screen. Usually, there are small rectangular shims which get the screen into exactly the right position. You may need to adjust these. Depending on where you bought the screen, it may have come with some. (Some cameras include shims to position the factory-installed screen, but some don't; I'm not ...


If you want Hugin to auto-recognize and correct for the lens, then probably the right tag to use is Samyang 8mm f/3.5 Fish-Eye CS, because this is the entry in the lensfun database, which is now integrated into Hugin use. In the slr-samyang.xml file the entry is: <lensdatabase version="1"> <lens> <maker>Samyang</maker> ...


I want to add the correct EXIF lens metadata... A lens not designed to communicate with the camera won't have EXIF data which would be deemed "correct" because the manufacturer didn't assign anything. If there's a community of Rokinon users, you might ask around to see if there's a string people are using for your lens so any profiles you get from ...


According this document there is no Exif.Canon.LensModel number, assigned to the Rokinon 8mm. So my opinion is you can't add value, which will be understandable for LR or Aperture P.S. LensInfo tag is for DNG format and I am not sure will work with CR2


First, a word about what depth-of-field is and is not: In a way, depth-of-field is an illusion. There is only one plane of focus. Everything in front of or behind the point of focus is out of focus to one degree or another. What we call DoF is the area where things look, to our eyes, like they are in focus. This is based on the ability of the ...


You do not have a fixed DoF. The DoF depends, apart from focal length and aperture, also on the subject distance (=what you are changing with the focus ring). So, with eg. a 50mm lens and f/2.8, if you focus at 46.6 meters, your DoF will even extend to infinity (hyperfocal distance)! While at 1 meter, the DoF is only 4cm.


Independently of what you shoot, video or still, what lens you use, changing focal point change Depth of Field. You can play for example with this online DoF calculator to see the effect:


Hyperfocal distance applies regardless of manual or automatic focusing. The hyperfocal distance is simply the distance at which (when focused on) everything beyond it is in focus. This is a set point for a given focal length, aperture and cone of confusion. It does not change regardless of if you focus manually or automatically.


Yes. The feature in the image that is focused on os the most in-focus distance, with some depth on either side being acceptably sharp. Having the touch-here focus is no different than using an old fashioned split prism: it focuses. Choose a feature to focus on that is in the middle of the intended depth. If you want to be sure, use the eyepiece (not the ...

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