Canon EOS 1Ds DOF

Hello

I just bought a Canon EOS 1Ds.

What will the Full Frame Sensor do with my DOF?

Gr

Richard

It will mail it to America and get married and have children... Seriously, it will make your DOF shallower.

asylumxl wrote in post #4112516
It will mail it to America and get married and have children... Seriously, it will make your DOF shallower.

Very Funny indeed!!

But how mutch will it be shallower!!!

CASE: 30D + 30mm F2.8
1Ds + 50m F4.0

http://www.dofmaster.c​om

Play with this by switching between crop cameras and the 1Ds.

http://www.outbackphot​o.com …hnique/essay07/​essay.html
this page illustrates the difference in depth of field between a nikon 1.5x crop and a 1ds sensor.

If you compare
1Ds w/ 160mm lens vs.
30D w/ 100mm lens (same FOV)
at the same aperture,

The hyperfocal distance of the 1Ds will be 1.6 times greater than the hyperfocal distance of the 30D.

In practical terms this means you need to stop down about 1 stop more with the 1Ds to get the same DOF, given lenses that generate the same FOV at the same distance.

cosworth wrote in post #4112542
http://www.dofmaster.c​om

Play with this by switching between crop cameras and the 1Ds.

Thanks... btw i followed your advice and bought the 1Ds! Great peace of material... i hope i wont be dissapointed with the ISO 1250!

the size of the sensor does absolutely nothing to your dof.
The degree of image magnification does. so if you are standing at the same spot, shotting an image 50 mm f 2.8, with your 30D, or 1Ds, the dof will be the same, but you will have more your image with 1Ds. now, if you shoot with 30D, 50, f 2.8, and then load the lens on 1Ds, and want to have the same framing, you will have to move closer to your subject, in which case, the image will look like it has been shot at 50 1.8 ( about 1.3 stop difference). Or alternatively, you can load up an 80 mm lens, at f4 to have same dof and general composition.

30d
100mm (crop factor comparision here)
f/2.8
subject 100 feet away
You get 33.5 feet of DOF

1Ds
160mm (crop factor comparision here)
f/2.8
Subject 100 feet away
20.3 ft of DOF

Are you sure about what you just said?

kevindar wrote in post #4112891
the size of the sensor does absolutely nothing to your dof.
The degree of image magnification does.

Wrong. CoC (a function of the sensor) is a factor in the equation for the calculation of DoF. Check your facts before posting. Cosworth is correct.

kevindar wrote in post #4112891
the size of the sensor does absolutely nothing to your dof. The degree of image magnification does.

Technically, this is true.

So if you're comparing prints of equal size from two different camera formats, the image from the smaller format camera must be magnified more when printed.

This is why a smaller circle of confusion value is used when calculating DOF from smaller format cameras, hence the differences in DOF noted by Cosworth.

I do not need an equation to tell me about dof. Circle of confusion and all that Jazz is what ever you want to make of it.
a lens, with a fixed aperture size, with a fixed distance from the subject, and image screen, will produce only one image, regardless of how big the screen is. That is my understanding of how the optics of the camera work. now if you decide to make the screen smaller, you should not be affecting the part of the image which is on the screen. your will just get less of the image. So I will still say that you will get the same exact image, from a 50 mm lens, at f 2.8, mounted on a 40D, 1D, or 5D. The only difference is that you get progressively more of the image moving down that line.

cosworth wrote in post #4112917
30d
100mm (crop factor comparision here)
f/2.8
subject 100 feet away
You get 33.5 feet of DOF

1Ds
160mm (crop factor comparision here)
f/2.8
Subject 100 feet away
20.3 ft of DOF

Are you sure about what you just said?

cosworth, please reread what I said.
50, 2.8, same as 80 4 (actually 4.5, since its about 1.3 stops)
so to use your example, it will be 160mm, f 4.5, 100 ft, dof 32.7 ft, same as 100 f 2.8

kevindar wrote in post #4113230
I do not need an equation to tell me about dof. Circle of confusion and all that Jazz is what ever you want to make of it.

I don't think an equation will help you if you don't understand the concept, and it appears you haven't reached that point yet.

Depth of field is the distance in front of and behind the focused distance that appears acceptably sharp. Print magnification is going to affect that.

As you said the DOF is a function of magnification. And the magnification is measured by comparing the size of object to size of sensor. Thats why sensor size has direct impact on DOF. Saying it in a different way, if at a particular aperture say 2.0, I take identical shots (using whatever focal length, as long as the same object fills up the image) with a 1.6x camera and a FF camera and then produce same size prints (say 8x10) the DOF would be shallower in the FF image.

kevindar wrote in post #4113230
I do not need an equation to tell me about dof. Circle of confusion and all that Jazz is what ever you want to make of it.
a lens, with a fixed aperture size, with a fixed distance from the subject, and image screen, will produce only one image, regardless of how big the screen is. That is my understanding of how the optics of the camera work. now if you decide to make the screen smaller, you should not be affecting the part of the image which is on the screen. your will just get less of the image. So I will still say that you will get the same exact image, from a 50 mm lens, at f 2.8, mounted on a 40D, 1D, or 5D. The only difference is that you get progressively more of the image moving down that line.