1 ACCEPTED SOLUTION
I realize that the JUDGMENT about myself and what I have placed is a very toxic judgment. I will not write anymore here. This was my first post on this forum and will be my last. If I knew I was going to read so much nonsense and wrong speculation about me and my resumes, I really wouldn't have made the post.
Life goes on….
@rascher wrote:Hello Trevor,
I photographed other animals, birds and lizards. I get every 20 images 4 or 5 sharp. With my old 5D mk3 I would never have such bad results…. In the images that I made available, the algorithm perfectly found the eyes of that animal, it's its own eyes, it's impressive, but the focus doesn't stay…… in the images in which the eyes were focused, the animal's body was not sharp! using f10 aperture!!! How is this explained? this insect's entire body should be in focus, it's a small insect!!! The depth of field is totally unrealistic!!
Hi Rodrigo.
Here is a screenshot of one of your images. The image data doesn't give the distance from camera to insect.
The insect head is nice and sharp but the body and tree trunk down from the head are soft.
I guess there are two possibilities - 1. f/10 does not produce sufficient DoF at that distance and focal length or 2. some phenomena is going on where during exposure parts of the image fall out of focus. I believe #1 is more likely.
AI Servo tracking is designed to identify and follow subjects as they move through the viewfinder. It does that by sampling the image and determining the location of a subject at points in time and predicting where the subject will be when the shutter actually opens. Your subjects appear stationary; the tree and insect look in the same location in all your images. It is possible that the camera is sensing its slight motion if you are touching the camera when you actuate the shutter and thinking that it is subject motion.
In any event, I would be using One Shot AF with spot focus on the eye bulge if I was taking those images. And I would check a DoF table to ensure that DoF was adequate.
@jrhoffman75 wrote:
@rascher wrote:Hello Trevor,
I photographed other animals, birds and lizards. I get every 20 images 4 or 5 sharp. With my old 5D mk3 I would never have such bad results…. In the images that I made available, the algorithm perfectly found the eyes of that animal, it's its own eyes, it's impressive, but the focus doesn't stay…… in the images in which the eyes were focused, the animal's body was not sharp! using f10 aperture!!! How is this explained? this insect's entire body should be in focus, it's a small insect!!! The depth of field is totally unrealistic!!
Hi Rodrigo.
Here is a screenshot of one of your images. The image data doesn't give the distance from camera to insect.
The insect head is nice and sharp but the body and tree trunk down from the head are soft.
I guess there are two possibilities - 1. f/10 does not produce sufficient DoF at that distance and focal length or 2. some phenomena is going on where during exposure parts of the image fall out of focus. I believe #1 is more likely.
AI Servo tracking is designed to identify and follow subjects as they move through the viewfinder. It does that by sampling the image and determining the location of a subject at points in time and predicting where the subject will be when the shutter actually opens. Your subjects appear stationary; the tree and insect look in the same location in all your images. It is possible that the camera is sensing its slight motion if you are touching the camera when you actuate the shutter and thinking that it is subject motion.
In any event, I would be using One Shot AF with spot focus on the eye bulge if I was taking those images. And I would check a DoF table to ensure that DoF was adequate.
The camera appears to be angled above the horizon, which would only contribute to creating the impression that the camera is experiencing focusing issues.
In other words, the shallow DoF created by the long focal length and the distance to the subject is only being made to appear even more shallow because of the camera angle to the subject.
@rascher wrote:Hi Waddizzle,
You are completely wrong in all your statements. As soon as I have time I will separate an image of a hummingbird taken near this angle and draw your conclusions again. Opening, subject distance and compare after I post.
FYI, 4cm is roughly equivalent to 1.5 inches. Assuming that you are using a 200mm lens with a 2x teleconverter. At f/11, you do not achieve 1.5” DoF until your at a distance of 10 feet, or 3 meters, from the subject.
