![]() Many modern cameras even have a feature called “focus bracketing” (or something similar) that can shoot by-ring focus stacks automatically, entirely controlled by the camera rather than by an attached device. Many lenses come equipped with motors that are usually used for automatic focus (“AF motor”), but those motors can also be controlled by software running in a computer or tablet that is tethered to the camera. For larger subjects, focus by ring, not by rail.īy the way, there's nothing that says you have to turn the focus ring by hand (“manual”). ![]() Summary: keep your lens in one place as much as possible. The DMap method handles this better than the PMax method shownĪbove for illustration, but really it's best to reduce or avoid movement Movement causes artifacts in the stacked result just like real movement of the Apparent movement of the subject due to camera That the different position of the camera lens causes them to look different.Įffect is the same, however: the subject appears to move and Zerene StackerĬannot compensate for this. Of course they’re not really tipping it’s just Views overlaid on each other and aligned as well as possible: This is easily seen in the following animation, which shows the two If scale were the only issue, Zerene Stacker could compensate for it.īut more importantly the subject also appears to have different Rail positioned to focus on foreground petal,Īnd rail positioned to focus on background leaf, Most obviously, the subject has different scales: Of the lens, the camera sees the world very differently at each end of the ![]() The by-rail result has big halos and looks smeared the by-ring result has only The focus-by-ring stack gives a much better result than focus-by-rail. When we look closer, other artifacts appear. Ways: by moving the camera on a focus rail, or by turning the focus ring on theĪlternatives, as stacked by the PMax method.ĭifference is the radial streaking “zoomburst” pattern in the background thatĪppears in the by-rail stack even though it certainly wasn’t present in the There are 9 cm of depth between the foreground petal and the farthest leaf. At f/4.5, it turns out that the lens provides only about 0.5 cm DOF, but To blur the background, we open the lens full wide, f/4.5 in thisĬase. Single flower in front of a textured background.Īll its leaves in sharp focus, while leaving the background as blurred as However, you can get far better results by turning the lensĪdjusting your lens will greatly reduce changes in perspective that can cause When you’re shooting something the size of a flower or maybeĮven a bouquet of flowers, you may be tempted to use that focus rail because it’s In other cases, the choice doesn’t matter much - a raisin blown up to full frame will come out fine using almost any method. If you’re shooting a landscape, then turn the focus ring - it’s the natural thing to do and it’s simple and effective. You need to do both of the above using the controls at your disposal.
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