Lovely portrait. Wonderful lighting, everything sharp or unsharp where it should be. Love the eyes. Thanks for posting.

Save your money. Cell phones are already cameras. This is only a little more than a grip. If you have hand problems, this might help.

You are welcome. Of the four lenses I tested, all were sharpest at about two stops down. The falloff was not steep so you not notice much of difference. However, the big take away is you really do not know until you test them properly. FoCal sure beats those cheap, static, and subjective tests.

I recommend that everyone read TriX's post very carefully. The only side he takes is that of objectivity. Thanks for taking the time to formulate this informative post.

Thank you for the clarification.

As you said, that challenges common sense. If my explanation is wrong, then I will admit to that. Nonetheless, I have found that my lenses improved by recalibration, also known as microadjustment. One can certainly question whether the improvement is noticeable or have lenses, new or used, that are optimal. I do accept both of these assertions. For me, I prefer to assume nothing and to conduct carefully controlled experiments.

I think the second could have used more sky. Something looks a bit funky. Might you have sharpened these too much?

Without knowing the experimental details and seeing the results, I would hesitate on generalizing from your experience.

Jerry, what that means is that they have migrated the desktop program to those devices so that you can run the tests and calibrations from any Android or IOS device. The app is not for adjusting the device's camera.

Good question. Yes, the increased depth of field may compensate for any focusing error. However, the maximum lens sharpness is often two stops down from the maximum aperture. As you stop down past that, diffraction decreases the sharpness. Just be aware of these issues.

Bill, I respect your experience. Focusing manually or using mirrorless obviates the need for calibration. My much more limited experience did show that calibrating did improve the sharpness. This is all a matter of expectation and comparison.

By sharpness, I mean focusing accuracy, not the optics.

Let me start with your second question. Lens manufacturers adjust the autofocus mechanism so that optics produce an image that is in focus at different apertures and distances. However, for some unknown reason, a user may find that when focusing a DSLR through the reflex system, not live view, even a brand new lens may not focus properly. You can expect this over time with a lens as the mechanical parts wear and fall out of adjustment. In these cases, the lens's sharpness depends upon the electromechanical mechanism that controls how the glass elements focus. Unless you compare the sharpness of your lens against another lens, previous test shots, or a standard, you may never notice the declining sharpness.

Calibration is the process of comparing the performance of your lens's focusing accuracy against that of an objective standard. If FoCal finds the performance can get better, then it will perform a microadjustment to the lens. FoCal tells the camera's onboard computer or the firmware in the lens (I do not know which) how much the lens must compensate for the wrong focusing.

I hope this answers your question without getting to technical.

I used this to calibrate my lenses several years ago but am now upgrading to the newest version. In addition to running on a desktop computer, it now runs on Android and IOS. It can also connect wirelessly via WiFi. The price is great, $99.88, down from $135.88. The simpler version is $89.99. A great price for an excellent product.

Interesting terrain done well. I am glad you did this as a panorama. That really captures the bareness. I noticed near and far seem in focus. Did you use focus stacking?

Thanks for posting.

Interestingly, PS's shake reduction is gone from 2023. I used it a lot and wonder what has replaced it.