24-105 Bokeh Quality?

How's the bokeh quality on the 24-105 - Let's say, the 24-105 on full frame vs 17-55 on APS-C, similar field of view and framing.

The reason I ask... I have a 7D + 17-55 and I might bite the bullet on a 5DIII. I would go for the 24-70, but the extra reach on the 24-105 sound tempting.

The background will be more blurry with the 24-105 on a FF camera.

Not a lot of OOF in these, but here's just two recent examples from the 24-105 on a 5D that pleasantly surprised me:

IMAGE LINK: http://www.flickr.com/​photos/mdstoop/6264455​962/

IMAGE LINK: http://www.flickr.com/​photos/mdstoop/6264455​680/

gonzogolf wrote in post #14612897

Remember bokeh is the quality of the blur, not the amount.. This is shot at 85 MM on a 5D @F4

Yes, I am aware of that. Thank you for sharing your image. Looks good enough to me.

I HAVE BEEN VERY PLEASED WITH MY 24-105 ON THE 5dII

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F4 on ff produces shallower dof than f2.8 on crop. Bokeh on the 24-105 is excellent imo.

Here's one at f4 -

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kin2son wrote in post #14613194
F4 on ff produces shallower dof than f2.8 on crop. Bokeh on the 24-105 is excellent imo

here we go again.....

no it doesn't.

pyrojim wrote in post #14613202
here we go again.....

no it doesn't.

Well please educate me.

Fact - f2.8 on crop will always produce ~f4.5 dof ff equivalent, regardless of focal length/FoV. Unless ofc you are talking about aps-h.

Use the link and input the values for yourself;

http://www.dofmaster.c​om/dofjs.html

Select a crop camera with 50mm and f2.8
Select a FF camera with 50mm and f/4

Compare the DOF

it's not bad, hence why I'm really happy with mine

here's one at f/8

IMAGE LINK: http://www.flickr.com/​photos/itaemo/72604622​88/

IMAGE LINK: http://www.flickr.com/​photos/itaemo/72604857​86/

Here's an interesting read on dof crop vs ff when trying to maintain same perspective. Scroll 1/2 way down the page.

http://www.cambridgein​colour.com …al-camera-sensor-size.htm

Rocky Rhode wrote in post #14613298
Use the link and input the values for yourself;

http://www.dofmaster.c​om/dofjs.html

Select a crop camera with 50mm and f2.8
Select a FF camera with 50mm and f/4

Compare the DOF

But that won't get you the same perspective....

It should really be a crop camera with 50mm f2.8 compared to a ff camera with 80mm f4...

Rocky Rhode wrote in post #14613298
Use the link and input the values for yourself;

http://www.dofmaster.c​om/dofjs.html

Select a crop camera with 50mm and f2.8
Select a FF camera with 50mm and f/4

Compare the DOF

but to get the same image framing, you'll have to move in closer and then the dof will be smaller or use a larger focal length and the dof will be smaller.