TrueDoF-Intro DoF Calculator

Simple. Useful. Accurate. Thank you.

Difference between black line distances doesn't agree with total on the bottom.

Wonderful little app. Perfect for helping me on my journey to zone focusing. I will be purchasing the paid app. The paid app lets one customize f-stops etc. thanks.

I like the visual indicators and I am okay with the idea of the shrinking DoF at smaller apertures. I want a readout of the slider settings (it could be in the slider legend area), "soft" stops on the sliders for common settings, and ability to tap and directly enter numeric values.

There are a lot of DoF apps out there but this one presents the settings and results in a very concise and logical way. After using it for a little while I “upgraded” to the full version (not the PRO version) to get the Hyperfocal distance function, although you can certainly get that from this app. Highly recommended for landscape photographers.

I think there should be an override for diffraction limiter so the user can decide what is acceptable sharpness.

Great interface, but the calculation is totaly wrong for f-stop numbers above f/16 or so. Not usable for my purposes.

This app is amazing. That said, it also takes some reading and understanding to use it correctly. Some of the other reviewers here are miss-understanding the point. Yes, they are correct in their observation of how DOF "should" increases with larger f numbers. Whereas the app indicates a decrease in DOF as the f number increases. The app is indicating that diffraction is softening the image as the f number increases. This is correct. So, yes, we do get more DOF with higher f numbers, but softer less sharp images. Therefore, there's no point in having great DOF if it's not sharp. Here's the thing, by definition, DOF is what will "appear" in sharp focus. DOF is a sum of sensor size, focal, distance, aperture, diffraction, viewing size, viewing distance and the viewer’s interpretation. Notice that diffraction is one of the elements of DOF, not contradicting it. The app is just helping you by preventing you from using an f number that is so unsharp that you will most likely not be able to use the image (a decrease in what is in acceptable focus/sharpness). So, the app is correct. And the reviewers are correct (from a technical/math point view if diffraction is not considered), but the app is factoring in more than just math. As a professional photography trainer, I use all of George's apps every day in my teaching and consulting. And they work! For most users, it is a bit confusing. Therefore, I highly suggest you visit the developer's website and read his articles on DOF, sharpness and diffraction. After that, you will never want to use anther DOF app again (nor should you).

..But error in calculation. This shows DOF DECREASING above a certain f-stop. In fact it should increase. Author should have compared with other calculators to verify.

I've shot controlled diffraction tests through all my cameras, and this seems quite accurate. The only thing I'd note is that it doesn't take pixel size into account. As the individual pixels on a certain size sensor decrease, the noticeable effects of diffraction increase. Technically it looks about right, but they should specify that the depth of field is still increasing at f16, f22, and so on, even though the image is becoming blurrier, which is an important difference in macro photography where diffraction limited images may be objectively better because wider apertures result in too shallow of a depth of field. 4 out of 5 only because they're treating DOF and diffraction as the same thing, otherwise this looks good and works really well.