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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 22 Dec 2009 (Tuesday) 17:03
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70-200L f/2.8 vs 70-200L f/4: The battle @ f/4

 
CheshireCat
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Dec 22, 2009 17:03 |  #1

100% crops.
Both lenses on 5D mark II, 200mm, manual focus on "15", tripod, MLU, default LR 2.6 sharpening.
The f/2.8 has been rotated a few degrees to match the f/4.


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canonnoob
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Dec 22, 2009 17:05 |  #2

still inconclusive because you had to rotate the 2.8... rotation can degrade the photo... lol

personally... none of this even matters lol... if you need the 2.8 get the 2.8 if you dont.. get the f4 lol simple choice.


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Megapixle
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Dec 22, 2009 17:07 |  #3

70-200L f/4 IS owners will be in here shortly to discredit your test...


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CheshireCat
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Dec 22, 2009 17:11 |  #4

canonnoob wrote in post #9247266 (external link)
still inconclusive because you had to rotate the 2.8... rotation can degrade the photo... lol

Honestly I cannot see the difference between the rotated photo and the original in these 100% crops: test is valid ! ;)


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MHO
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Dec 22, 2009 17:14 |  #5

Megapixle wrote in post #9247277 (external link)
70-200L f/4 IS owners will be in here shortly to discredit your test...

LOL :lol:

Well , what I can pick on is: slightly more contrast in the shot from f4. Slightly more CA from the f2.8 @ extreme bright coloured edges and a little better sharpness (marginal!) from the f4 but that's just being picky.


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CheshireCat
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Dec 22, 2009 17:19 |  #6

MHO wrote in post #9247306 (external link)
Well , what I can pick on is: slightly more contrast in the shot from f4. [...]

Actually I prefer the lower contrast on the 2.8 due to less digital noise and better shadows. I usually increase contrast - if needed - in PP.
The 5D2 has ugly digital noise patterns.


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Lowner
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Dec 23, 2009 06:07 |  #7

I see a very slightly sharper shot from the f/2.8. Theres more contrast and a slight difference in exposure which disguises it a little.

I don't have the IS version, because acording to lab tests at the time I was buying the non IS f/2.8 is very slightly better than it's younger brother. In the real world it makes no difference which of the three you use.


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Savas ­ K
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Dec 23, 2009 09:26 |  #8

Try a similar test; versatility, about shooting fast moving action indoors under marginal light.




  
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rijndael
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Dec 23, 2009 09:41 |  #9

If your primary use for the 70-200 would be outdoor events for kids, when would you need the f/2.8 over the f/4? Strictly a dusk and dawn issue?




  
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just_a_hobby
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Dec 23, 2009 09:57 |  #10

rijndael wrote in post #9250974 (external link)
If your primary use for the 70-200 would be outdoor events for kids, when would you need the f/2.8 over the f/4? Strictly a dusk and dawn issue?

yes, dusk and dawn issue because of the low lighting, but not strictly. you can also use f/2.8 over f/4 when you want narrower DOF as well. And, also if you feel like working your arm a little too.


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rijndael
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Dec 23, 2009 09:59 as a reply to  @ just_a_hobby's post |  #11

Thanks. I'm trying to decide between the two. I'm not overly concerned about the price of the f/2.8 if I can justify the need for f/2.8 over f/4 ..... I'm not convinced yet.




  
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Mastamarek
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Dec 23, 2009 09:59 |  #12

hmmm weird, 2.8 looks better to me here. F4 looks to be suffering a bit CA.


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crn3371
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Dec 23, 2009 11:33 |  #13

Maybe I'm just missing something here. I don't see really what this test proves, or disproves. One lens is stopped down, the other wide open. Either compare them both wide open, or both stopped down. To me, debating the sharpness of the 70-200 L's is kind of like debating the sharpness of Bic razors vs Gillette razors, they're all sharp.




  
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zshaft
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Dec 23, 2009 11:45 |  #14

canonnoob wrote in post #9247266 (external link)
still inconclusive because you had to rotate the 2.8... rotation can degrade the photo... lol

personally... none of this even matters lol... if you need the 2.8 get the 2.8 if you dont.. get the f4 lol simple choice.

your statement doesnt make sense. where did u learn that ?


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thaking
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Dec 23, 2009 11:50 |  #15

zshaft wrote in post #9251615 (external link)
your statement doesnt make sense. where did u learn that ?

you referring to the degradation portion? do a quick google search for "photo rotation degradation photoshop" or something similar...you'll see that this can, and does, degrade the photo...

if you're referring to his overuse of LOL, then i can't help ya there...




  
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70-200L f/2.8 vs 70-200L f/4: The battle @ f/4
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