Check your JS console, and see what warnings are showing up. If it’s not generating then the odds are that there’s a JS error that’s causing the execution of the scripts to halt/fail to execute. The contents of the Aperture select box are generated by the JS doing the calculations. Loading the page with the developer console open should also force the browser’s cache to be ignored.) If you liked this article, please smash the like button, and share this with your friends.ġ) What browser are you using? (Try a different one if you have another installed.)Ģ) Are you running a content/ad blocker? (I don’t actually care if you do, but make sure that it’s not blocking scripts from, , or jquery from )ģ) Have you flushed your browser’s cache and reloaded the page? (The HTML is the only thing that changed, and that shouldn’t be cached. This process is repeated until either infinity is reached, 999 steps have been taken, or the specified far depth of field limit has been reached. Then shift the focus position towards infinity by “focus step” × 1/8 of that depth of field. With those assumptions in hand, I calculate the depth of field for the specified lens, aperture, crop size, and initial (close) focus distance. This formula can be traced back to film photography and in some respects may be insufficient for modern high resolution digital cameras - at least in some applications. Namely I’m using the same standard that most camera manufacturer’s use when they calculate depth of field. The second assumption deal with the acceptable threshold for the depth of field. I’m fairly confident in the accuracy of this assumption, as in my testing a focus increment of 8 on my EOS R5 corresponds to a focus shift that’s approximately 1 depth of field deep. It’s what an AF micro adjustment step was, as well as the smallest shift you could make when remotely controlling the focus via Canon’s EOS Utility. First, 1/8 of a depth of field has historically been the size of the smallest AF increment available on Canon cameras. My assumption at the present time is that the focus steps are equal to 1/8 of a depth of field. Nikon calls this “Focus step width” on cameras such as the Z6 II and Z7 II. Canon calls this “focus increment” on cameras such as the EOS R5. First relates to the size of the focus shift between images. I’ve made two major assumptions in the development of this too. See the following table for examples Assumptions and Theory To use the calculator enter your lens’s focal length, the aperture you will be shooting at, whether or not you have the camera set to APS-C crop mode, the focus step size you’ve set, and the starting and ending distances for the stack you want to shoot.ĭistances are a free form number that’s parsed by the script and can be specified in either feet, inches, feet and inches, meters, or millimeters. Please note, this calculator is still in beta and may not provide accurate results in all conditions. This calculator computes the number of frames needed to make a focus stack with a focus shift specified in the focus step field that covers from the starting distance to the ending distance.
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