FOV calculaton
Jan 29, 2022 12:27:35 #
Jan 29, 2022 13:25:44 #
Jan 29, 2022 13:32:30 #
Longshadow wrote:
Boy am I glad I don't worry about it.
LOL yup that was my thought too......I didn't mind most of physics but I have to say optics was not something I would want to brag about.
Jan 29, 2022 13:50:10 #
reverendray wrote:
LOL yup that was my thought too......I didn't mind most of physics but I have to say optics was not something I would want to brag about.
Physics and the sciences were my favorite subjects in school.
But this is a solution to which I have no problem.
Jan 29, 2022 20:06:26 #
reverendray wrote:
LOL yup that was my thought too......I didn't mind most of physics but I have to say optics was not something I would want to brag about.
It's rather simple math yet it's not all that useful to know either.
Jan 30, 2022 06:49:04 #
BebuLamar wrote:
It's rather simple math yet it's not all that useful to know either.
I boiled it down to just a few relevant points:
1) with the 63 degree angle of view on a 35 mm lens (full frame) I need to be at least 6' away from a 6' tall person to get their head and feet in the picture.
2) with the 91 degree angle of view on a 21 mm lens, I can get the contents of a room if I get the camera in a corner.
Actually, in practice I had to modify these cases slightly. Angle of view is measured diagonally across from one corner to a diagonally opposite corner, so for complete wall-to-wall room coverage I needed something slightly wider than a 21mm lens. And while I could get the head and feet in the 35mm frame from just a few inches past 6' from my subject, I needed to be a bit further back to get a full person into an 8x10 format--so now I stand a bit over 7 feet back as a minimum. I definitely do not recommend this lens and distance combination as a technique for good portraiture!
I think angle of view matters more with view cameras, where the lens might be moved off axis.
Jan 30, 2022 06:55:09 #
AZNikon
Loc: Mesa, AZ
reverendray wrote:
https://scantips.com/lights/fieldofviewmath.html
I'm going to lie down now, I have a headache...
Jan 30, 2022 08:02:59 #
I'm more concerned with the depth of field since I can see the field of view easily.
For the depth I have a dof calculator on my phone.
For the depth I have a dof calculator on my phone.
Jan 30, 2022 08:30:26 #
chikid68 wrote:
I'm more concerned with the depth of field since I can see the field of view easily.
For the depth I have a dof calculator on my phone.
For the depth I have a dof calculator on my phone.
You open a new can of worms. When you calculate the depth of field you need to enter the focus distance. How do you find out what the focus distance is? It's not an easy task.
Jan 30, 2022 08:59:08 #
AZNikon wrote:
I'm going to lie down now, I have a headache...
Jan 30, 2022 09:00:44 #
MrPhotog wrote:
I boiled it down to just a few relevant points: br... (show quote)
I just look through the viewfinder and see if I need to change the lens focal length or backup.
No way I'm going to worry about how many degrees...
Jan 30, 2022 09:02:02 #
BebuLamar wrote:
You open a new can of worms. When you calculate the depth of field you need to enter the focus distance. How do you find out what the focus distance is? It's not an easy task.
Guestimate but like I said that's why I have the calculator for dof .
In my case it's mainly so we can get the best depth of field while still making the best of the available lighting.
This is useful for candid event photos which is my main specialty.
I do the candids while my wife does the posed shots.
Our clients really like the fact that they get both.
Jan 30, 2022 09:07:44 #
chikid68 wrote:
Guestimate but like I said that's why I have the calculator for dof .
In my case it's mainly so we can get the best depth of field while still making the best of the available lighting.
This is useful for candid event photos which is my main specialty.
I do the candids while my wife does the posed shots.
Our clients really like the fact that they get both.
In my case it's mainly so we can get the best depth of field while still making the best of the available lighting.
This is useful for candid event photos which is my main specialty.
I do the candids while my wife does the posed shots.
Our clients really like the fact that they get both.
But the calculator is useless if you don't have precise information to feed it. As for estimate depth of field you could estimate it without the calculator.
Jan 30, 2022 09:07:47 #
AZNikon wrote:
I'm going to lie down now, I have a headache...
Me too!
Jan 30, 2022 09:20:59 #
BebuLamar wrote:
But the calculator is useless if you don't have precise information to feed it. As for estimate depth of field you could estimate it without the calculator.
But it is a lot easier to estimate that you are five feet away from the subject than to have to factor in that at f 1.8 the depth of field at five feet is going to be about three inches actually in focus.
The footage is a lot more forgiving as for guessing.
Especially since the calculator gives the range of in focus.
It's been working for me for the last few years without precise figures.
But you stick to what works for you and I'll be busy capturing images instead.
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