This post is kind of a 'statement' and also kind of a 'question' all in one...
The images below are not anything spectacular but they demonstrate a point that I would like others more in the know to possibly expand on so that I (and others) can learn more...
The images below were taken with a 50mm (Rokinon P) prime lens @ f1.4 ....I put the figuring out about 1 meter if I remember correctly (the yellow line is a tape measure)....(This is one of my many experiments...)
I am trying to learn how to make better use of the DOF at large apertures, well at any aperture really but that's a different story...
Now here is my 'point' so to speak...imagine if you had a large imaginary ice cream cone that extends out from your lens. When you get to your focal point it goes flat on the end thus creating a 'narrow DOF' (noting that the bigger the aperture the thinner the in focus plane, and smaller aperture the wider it is).
In my case as demonstrated in image 1 the DOF is just an inch or two thick. The figurine is maybe a couple inches tall...you can see it right there...I don't know the technical words for it but it appears to create a 'focal plane' at the point of focus...
The shot was taken on a level plane with the subject... It was as flat as I could get it...I created what I am calling a 'box shot'. I really am making up all sorts of words to try and describe what I am thinking...
Now in photo 2 I didn't change a single setting but I did raise my camera and have it mounted on a tripod looking down on the subject at an angle....
Look how much more of the image is 'in focus'...
I was shooting down and creating more of a 'flat plane' for the camera to look at... my 'imaginary ice cream cone' got a corner knocked off and became sort of a 'triangle' so to speak...my 'focal plane' was altered significantly by my angle of shot.
I don't know the technical term but I will say 'focal plane' for the sake of argument was changed drastically merely by the angle I pointed the camera...
Am I getting warmer? Anyone that knows more about this care to expand more?