DOF and Cropping take 2

Started Feb 11, 2014 | Discussions thread
awaldram Forum Pro • Posts: 13,188
Re: DOF and Cropping take 2

moving_comfort wrote:

awaldram wrote:

As they say proof is in the eating

Bit rough and ready but as your both saying the Q will show 4X more DoF than the K3 precision isn't required to prove your wrong

Where has anyone said that?


So does cropping give the same DoF if the same lens is use irrelvant of sensor?

This proves without any doubt in my opinion a lens characteristic do not alter by sensor size.

I'm not quite sure what point you're trying to make with that comparison, and can't know for sure what angle and position you took the shot from, but doesn't the above speak to the following? :

* If you use the same lens on an APS-C crop sensor camera and a 35mm full frame body and crop the full frame 35mm image to give the same view as the APS-C crop image, the depth of field is IDENTICAL

(in this case you're not comparing aps-c to FF, you're comparing Q to aps-c, but same principle.)

In which case the act of cropping (and enlarging) is equalizing things from the original, uncropped image (ie - changing DOF from the original) - as expected, and described by me, Ian, Bob Atkins, Cambridge Tutorials (the 'good' link ) and everyone else who knows what they're talking about?

So why did you contest me here.?

Are you now admiting you were talking rubbish and f2.8 on mf,ff,aps-c or indeed Q will not effect exposure ?

and that to say f2.8 = f2.8 is not crazy but correct.?

and this

or from the thread that started it all 3months ago

so lets try and make it clearer

In photography, the circle of confusion (“CoC”) is used to determine the depth of field, the part of an image that is acceptably sharp. A standard value of CoC is often associated with each image format, but the most appropriate value depends on visual acuity

Nothing todo with sensor sizes at all !!

So if you finally agree then maybe you've learnt something ?

Unfortunately your obsession with proving everybody needs FF blinds you in everything and prevent you being objective or even understanding any other viewpoint.

Even when that viewpoint is the same as yours but from the other side as in Cambridge in colours two page references you slander the same author for one yet laud him for the other. When both say the same thing only your to blind to see.


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