I am considering going from a 20D to a bigger frame option, full or the 1.3. maybe a used 5D or a 1D.
Besides the obvious gain on better image quality, will I see a great deal of improvement on the quality of bokeh in out of focus area shooting wide open?
Anybody has samples of the same lens, wide open, or close to wide open, shooting with a 1,6 sensor like a 20D, 30D or 40D, against full or 1,3frame?
HI Nathan
So you say that if I fill the frame the same way. With my 20D and with a regular 5D.
Using the same 24-70.
Lets say a face touching the edges up and down, shooting open to 2.8, the out of focus background will look the same ?
That was my question
OK the 3 paramaters that control DOF and also the resultant bokeh.
Distance to subject and or backround
Focal length of the lense
Apature of the lens
Now to fill the frame equally between FF and crop you have to change 1 of the first 2 so you will change the resultant image.
You will either have to move closer to the subject or use a longer focal length.
As you do either of these the effective appature (as far as DOF is concerened will be the amount of crop (1.6 or 1.3) stops better/wider
huguito wrote:
HI Nathan
So you say that if I fill the frame the same way. With my 20D and with a regular 5D.
Using the same 24-70.
Lets say a face touching the edges up and down, shooting open to 2.8, the out of focus background will look the same ?
That was my question
Hugo
No...if you fill the frame the same way, you will be closer with the 5D than you would be with the 20D. That difference in distance will impact the DOF.
huguito wrote:
HI Nathan
So you say that if I fill the frame the same way. With my 20D and with a regular 5D.
Using the same 24-70.
Lets say a face touching the edges up and down, shooting open to 2.8, the out of focus background will look the same ?
That was my question
Hugo
If you fill the frame the same way, your subject distance will be different and as a result of the different subject distance ratio, this will effect the appearance of the bokah. Nathan is right...this will instigate alot of argueing back & forth.
I'm going to chime in on the usage of the term 'bokeh'. Bokeh refers ONLY to the aesthetic QUALITY of out of focus light sources. I.e. its a term to describe the quality and NOT the amount of background blur. Hence its a property only of the lens.
As Nathan said, the quality of the background blur (bokeh) is a feature of the lens design and will not change with the sensor size. But as others are pointing out (and as was discussed and demonstrated at length in the thread I referenced) in many shooting situations you can and do achieve a larger quantity of background blur (often mistakenly referred to as bokeh) with a larger sensor.
If we discuss the quality of the bokeh, you also need to look at the number of aperture blades. Most photogs seems to prefer that OOF lights have a round appearance. The more blades you have, the closer you get to round.
Thanks everyone. I was not very clear in my question.
i was not asking about quantity of bokeh, I understand the relation between distance from subject and out of focus plane.
O was more interested in the very hard to define "Quality or Creaminess" of the out of focus area using the same level of glass.
Hugo
huguito wrote:
Thanks everyone. I was not very clear in my question.
i was not asking about quantity of bokeh, I understand the relation between distance from subject and out of focus plane.
O was more interested in the very hard to define "Quality or Creaminess" of the out of focus area using the same level of glass.
Hugo
Of course the "creaminess" increases with the amount of blur that you have - which is potentially higher with a larger sensor.
But the overall quality of this blur is not changed by the sensor. If a lens provides you with nisen type bokeh on an APS-C sensor, then it will still do the same on a FF sensor.
well the quality could increase as if your closer to the subject or use a longer focal length you will diffuse the background more (as long as the distance between subject and background is the same). But the character of the lens will remain the same
