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Thread started 04 Feb 2010 (Thursday) 00:55
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DOF differences in my 24-70L and old sigma 24-70 non hsm at 24mm and 2.8. why?

 
booja
Goldmember
1,629 posts
Joined Jan 2008
houston, tx
Feb 04, 2010 00:55 |  #1

i use to have an old sigma 24-70 ex dg macro that i used on my 5d classic and on my 5d2. because of focus reliability issues i sold it and got the brick. i use to use the wide end alot and i usually shoot wide open unless i want to catch everything in focus. lately i have noticed that my brick L doesnt pop or separate the background and subject as well as my sigma did. i thought it was me and maybe i wasnt close enough on some pics but in some old photos i took with the sigma i noticed the DOF was thinner at 24mm and at 2.8

i know this isnt the best way to test by looking back at old photos but ive shot with the sigma for 1 year and the brick L for 1 year and noticed something was different right when i got the L. if i can get my friends sigma 24-70 ill do some real tests but for now ill show some pics of things ive snapped with both lenses on the wide end at 2.8 both on FF

here is a close quarter angle shot with the brick L at 24mm and 2.8

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and heres a quarter angle shot of another car with the sigma at 24mm and 2.8 (you can notice that its already out of DOF limit when it reaches the side mirror and in the other one most of the car is in focus... and i was closer to the car in the first pic... which should make the DOF thinner)

IMAGE: http://farm4.static.flickr.com/3571/3828556421_ef175d7dd5_b.jpg

this one next is of the canon L at 24mm at 2.8. i focused on the viper and notice the other cars down the line are still in focus

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this one is focused on the front end of the Z. and i couldnt even get the whole car in focus... i was standing even further back so the DOF should not have been as thin as the other one with the viper.

IMAGE: http://farm3.static.flickr.com/2545/3829365850_5e5cc2d177_b.jpg

here another example

the brick... this one is real noticeable... all the people in the background are still in focus... even the tree and the free way

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siggy...

IMAGE: http://farm3.static.flickr.com/2578/3828560609_109ab7b480_b.jpg

i know, i know... this isnt a "real" test. i am going to borrow my friends siggy just to find out for myself.

but in most you can tell that i was closer with the brick and yet the siggy had thinner DOF. i cant even get a whole car in focus with the siggy but the canon gets the car and then some... both on FF at 24mm at 2.8... unless this is corner sharpness and the bad corner sharpness of the siggy is making it look like bokeh and background blur when it is really not.... i dunno



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ed ­ rader
"I am not the final word"
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22,691 posts
Gallery: 3 photos
Joined May 2005
silicon valley
Feb 04, 2010 01:04 |  #2

booja wrote in post #9537506external link
i use to have an old sigma 24-70 ex dg macro that i used on my 5d classic and on my 5d2. because of focus reliability issues i sold it and got the brick. i use to use the wide end alot and i usually shoot wide open unless i want to catch everything in focus. lately i have noticed that my brick L doesnt pop or separate the background and subject as well as my sigma did. i thought it was me and maybe i wasnt close enough on some pics but in some old photos i took with the sigma i noticed the DOF was thinner at 24mm and at 2.8

i know this isnt the best way to test by looking back at old photos but ive shot with the sigma for 1 year and the brick L for 1 year and noticed something was different right when i got the L. if i can get my friends sigma 24-70 ill do some real tests but for now ill show some pics of things ive snapped with both lenses on the wide end at 2.8 both on FF

here is a close quarter angle shot with the brick L at 24mm and 2.8


and heres a quarter angle shot of another car with the sigma at 24mm and 2.8 (you can notice that its already out of DOF limit when it reaches the side mirror and in the other one most of the car is in focus... and i was closer to the car in the first pic... which should make the DOF thinner)


this one next is of the canon L at 24mm at 2.8. i focused on the viper and notice the other cars down the line are still in focus


this one is focused on the front end of the Z. and i couldnt even get the whole car in focus... i was standing even further back so the DOF should not have been as thin as the other one with the viper.


here another example

the brick


siggy...


i know, i know... this isnt a "real" test. i am going to borrow my friends siggy just to find out for myself.

but in most you can tell that i was closer with the brick and yet the siggy had thinner DOF. i cant even get a whole car in focus with the siggy but the canon gets the car and then some... both on FF at 24mm at 2.8

sounds like the canon is wider which would also explain the difference in DOF.

ed rader


http://instagram.com/e​draderphotography/ (external link)
5D4, 80d, 16-35L III, 24-70L II, 70-200L F4 IS, 100-400L II, sigma 15mm FE, 35mm ef-s macro, 430exII, gitzo 3542, markins Q10, kirk, really right stuff

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booja
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Goldmember
1,629 posts
Joined Jan 2008
houston, tx
Feb 04, 2010 01:05 |  #3

ed rader wrote in post #9537540external link
sounds like the canon is wider which would also explain the difference in DOF.

ed rader

i looked at both of these aspects as well when i had both in my hand... the canon was longer at the 70mm end and the siggy was wider at the 24 end




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ed ­ rader
"I am not the final word"
ed rader's Avatar
22,691 posts
Gallery: 3 photos
Joined May 2005
silicon valley
Feb 04, 2010 01:07 |  #4

booja wrote in post #9537544external link
i looked at both of these aspects as well when i had both in my hand... the canon was longer at the 70mm end and the siggy was wider at the 24 end

the numbers aren't accurate. e.g. the 24-105L is wider than the 24-70L.

ed rader


http://instagram.com/e​draderphotography/ (external link)
5D4, 80d, 16-35L III, 24-70L II, 70-200L F4 IS, 100-400L II, sigma 15mm FE, 35mm ef-s macro, 430exII, gitzo 3542, markins Q10, kirk, really right stuff

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DOF differences in my 24-70L and old sigma 24-70 non hsm at 24mm and 2.8. why?
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