6D MkII, Diffraction Correction

[brightcolours]

I never brought up DoF and as you can see...it is not a variable in the calculation of Diffraction Limit

You brought up print size and viewing distance,

Yes as they are variables in the Diffraction Limit calculation

They are not. Using a silly "diffraction calculator" that thinks that is how it is done, is your own responsibility, but not in any way a correct way.

Diffraction happens inside the lens, and gets recorded on sensor level. Viewing distance and print size never come into play.

Loading…

www.edmundoptics.com

https://www.cambridgeincolour.com/tutorials/diffraction-photography.htm

Loading…

en.wikipedia.org

Again, viewing distance and print size and visual acuity are used to calculate the CoC for DOF assessment. They do not belong in a diffraction limit calculator.

which ARE about DOF and not about diffraction.

and DoF is not a variable in that calculation. Apples and oranges

Examples:

diffraction limit depends on the pinhole radius, ro. It is defined by the angle Δθ = t0λ/2πro where t0 = 3.832

we are speaking about how the Diffraction Limit is derived (f9,3 in this case)...not how the DoF number is derived

 

[Mako2011]

I never brought up DoF and as you can see...it is not a variable in the calculation of Diffraction Limit

You brought up print size and viewing distance,

Yes as they are variables in the Diffraction Limit calculation

They are not.

As you can see in the actual Diffraction Limit calculator and associated formulas...they are

Again, viewing distance and print size and visual acuity are used to calculate the CoC for DOF assessment.

And in Diffraction Limit calculation as well...but unlike the calculation for DoF...subject distance is not a variable

They do not belong in a diffraction limit calculator.

Looking at the actual calculator and formulas,,,apparently they are

which ARE about DOF and not about diffraction.

and DoF is not a variable in that calculation. Apples and oranges

Examples:

diffraction limit depends on the pinhole radius, ro. It is defined by the angle Δθ = t0λ/2πro where t0 = 3.832

we are speaking about how the Diffraction Limit is derived (f9,3 in this case)...not how the DoF number is derived

What is the Diffraction Limit for the 6DmrkII at at ~550 nm? Let us know how you calculated it. Thanks in advanced

--
My opinions are my own and not those of DPR or its administration. They carry no 'special' value (except to me and Lacie of course)

 

[brightcolours]

I never brought up DoF and as you can see...it is not a variable in the calculation of Diffraction Limit

You brought up print size and viewing distance,

Yes as they are variables in the Diffraction Limit calculation

They are not.

As you can see in the actual Diffraction Limit calculator and associated formulas...they are

Oh, you deleted the links that show this not to be the case?

Loading…

www.edmundoptics.com

Here is a very in-depth (and correct) article about diffraction (among other things, so enough to confuse again).

Do Sensors Out Resolve Lenses?

Do Sensors Out Resolve Lenses? - Luminous Landscape

luminous-landscape.com

Again, viewing distance and print size and visual acuity are used to calculate the CoC for DOF assessment.

And in Diffraction Limit calculation as well.

No, that is incorrect.

..but unlike the calculation for DoF...subject distance is not a variable

They do not belong in a diffraction limit calculator.

Looking at the actual calculator and formulas,,,apparently they are

which ARE about DOF and not about diffraction.

and DoF is not a variable in that calculation. Apples and oranges

Examples:

diffraction limit depends on the pinhole radius, ro. It is defined by the angle Δθ = t0λ/2πro where t0 = 3.832

we are speaking about how the Diffraction Limit is derived (f9,3 in this case)...not how the DoF number is derived

What is the Diffraction Limit for the 6DmrkII at at ~550 nm? Let us know how you calculated it. Thanks in advanced

 

[Mako2011]

I never brought up DoF and as you can see...it is not a variable in the calculation of Diffraction Limit

You brought up print size and viewing distance,

Yes as they are variables in the Diffraction Limit calculation

They are not.

As you can see in the actual Diffraction Limit calculator and associated formulas...they are

And in Diffraction Limit calculation as well.

No, that is incorrect.

As you can see below...it is correct.

..but unlike the calculation for DoF...subject distance is not a variable

They do not belong in a diffraction limit calculator.

Looking at the actual calculator and formulas,,,apparently they are

which ARE about DOF and not about diffraction.

and DoF is not a variable in that calculation. Apples and oranges

Examples:

diffraction limit depends on the pinhole radius, ro. It is defined by the angle Δθ = t0λ/2πro where t0 = 3.832

we are speaking about how the Diffraction Limit is derived (f9,3 in this case)...not how the DoF number is derived

What is the Diffraction Limit for the 6DmrkII at at ~550 nm? Let us know how you calculated it. Thanks in advanced

no answer? Then f9.3 it is

--
My opinions are my own and not those of DPR or its administration. They carry no 'special' value (except to me and Lacie of course)

 

[Marek M]

I never brought up DoF and as you can see...it is not a variable in the calculation of Diffraction Limit

You brought up print size and viewing distance,

Yes as they are variables in the Diffraction Limit calculation

They are not.

As you can see in the actual Diffraction Limit calculator and associated formulas...they are

And in Diffraction Limit calculation as well.

No, that is incorrect.

As you can see below...it is correct.

..but unlike the calculation for DoF...subject distance is not a variable

They do not belong in a diffraction limit calculator.

Looking at the actual calculator and formulas,,,apparently they are

which ARE about DOF and not about diffraction.

and DoF is not a variable in that calculation. Apples and oranges

Examples:

diffraction limit depends on the pinhole radius, ro. It is defined by the angle Δθ = t0λ/2πro where t0 = 3.832

we are speaking about how the Diffraction Limit is derived (f9,3 in this case)...not how the DoF number is derived

What is the Diffraction Limit for the 6DmrkII at at ~550 nm? Let us know how you calculated it. Thanks in advanced

no answer? Then f9.3 it is

Thank you for "beyond detail" explanation but I did not mean to start a war.

--
My opinions are my own and not those of DPR or its administration. They carry no 'special' value (except to me and Lacie of course)

 

[whakapu]

Tables on the-digital-picture.com site. Diffraction may be occurring at all apertures but it's effect is less than the sharpness benefit gained from stepping down, up to a certain point. Your benefit from shooting full frame is that you do get some benefit from stepping down and can use fairly small apertures.

 

[brightcolours]

I never brought up DoF and as you can see...it is not a variable in the calculation of Diffraction Limit

You brought up print size and viewing distance,

Yes as they are variables in the Diffraction Limit calculation

They are not.

As you can see in the actual Diffraction Limit calculator and associated formulas...they are

And in Diffraction Limit calculation as well.

No, that is incorrect.

As you can see below...it is correct.

..but unlike the calculation for DoF...subject distance is not a variable

They do not belong in a diffraction limit calculator.

Looking at the actual calculator and formulas,,,apparently they are

which ARE about DOF and not about diffraction.

and DoF is not a variable in that calculation. Apples and oranges

Examples:

diffraction limit depends on the pinhole radius, ro. It is defined by the angle Δθ = t0λ/2πro where t0 = 3.832

we are speaking about how the Diffraction Limit is derived (f9,3 in this case)...not how the DoF number is derived

What is the Diffraction Limit for the 6DmrkII at at ~550 nm? Let us know how you calculated it. Thanks in advanced

no answer? Then f9.3 it is

You keep deleting parts. Why?

And I already showed that diffraction limits with ~20mp FF sensors already occur past f4.

 

[brightcolours]

Tables on the-digital-picture.com site. Diffraction may be occurring at all apertures but it's effect is less than the sharpness benefit gained from stepping down, up to a certain point.

The lenstip MTF data shows that for 21/22mp sensors diffaction already limits lenses past f4.

Your benefit from shooting full frame is that you do get some benefit from stepping down and can use fairly small apertures.

That is misunderstanding apertures. f11 on FF is the same as 11 / 1.6 = f6.88. That is the same aperture, and with similar sensor resolution, you will get similar diffraction softening effects on pixel level and image level at those apertures on APS-C and FF.

And of course, similar DOF.

An example: an APS-C lens, the EF-M 22mm f2 STM.

It has a FF equivalent focal length of 22 x 1.6 = 35.2mm.
It has an aperture at f2 of 22 / 2 = 11mm diameter.
It has an equivalent FF f-stop at f2 of 2 x 1.6 = f3.2

A 35.2mm f3.2 lens has an aperture at f3.2 of 11mm.

Same FOV, same DOF, equivalent focal length, equivalent f-stop, same aperture, same diffraction softening at pixel level (when using similar resolution sensors) and at image level.