It turns out it works out to 3.03° (3° is close enough). Divide 90 by 1700 and take the arcsine of the result. Your mobile phone probably has a calculator on it that can do sine / arc-sine. Then it's: arcsine( tilt-angle) = 90 ÷ 1700 If the lens a 90mm tilt shift and the distance from the lens axis to the ground is 1.7 meters (1.7 meters = 1700mm) The tilt formula is: arcsine( tilt-angle) = lens-focal-length ÷ distance from lens-axis to desired focal plane it's *probably* about 1.7 meters from your eyes to the ground. If you were taking a photo of landscape while holding the camera at eye-level. And since the units need to be the same and the lens is in millimeters, the distance from the lens axis to the focal plane *also* needs to be in millimeters.
it's either 17, 24, 45, 50, 90, or 135) and also the distance from the lens axis to the desired plane of focus. the correct tilt-angle is based on knowing the focal length of the lens (that's easy to know. It could be improved with a diagram.Īt the bottom of the article, the author has a list for a few lenses. It also offers some practical advice where you don't use the formula. So this article linked above is actually pretty good. I eventually did find articles that gave the formula and confirmed that I what I found was correct. I ultimately found enough info that I was able to derive the formula and then did a bit of testing to make sure it worked.
Originally I found articles that just hinted around at it. That was a less-straight-forward search than I would have expected. When I noticed the the index marks on the tilt-angle and verified that those marks are, in fact, degrees of tilt, I realized their *must* be a reason that the lens makers mark the degrees.
CANON DSLR TILTSHIFT 3D PRINT HOW TO
I generally find (a) the "miniature" effect, or (b) someone who explains how to maximize the focus but explains the concept while not providing the steps to follow to achieve the results. Not a video, but here's an article that may be helpful:
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