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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 23 Oct 2008 (Thursday) 19:49
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70-200mm f4 IS sweet spot?

 
MinhThien
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Oct 23, 2008 19:49 |  #1

Hi guys what is the sweet spot of your 70-200f4is? Mine isn't sharp at f4! In good lightning i think f8 looks best?


Eric
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Dave ­ Jenkins
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Oct 23, 2008 20:05 |  #2

Mine doesn't have a sour spot. It's sweet at every aperture. (5D, 70-200 f4L, 1/80th sec. @f4, ISO 3200)


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AustinWolf
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Oct 23, 2008 20:28 |  #3

f4 @200mm always looks sharp with mine.


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MinhThien
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Oct 23, 2008 20:39 |  #4

omg! I guess i should send in my for service?


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Jman13
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Oct 23, 2008 20:44 |  #5

If yours isn't sharp at f/4, then you need to send it to Canon or return it if it's new. The 70-200 f/4L IS should be absolutely tack sharp at f/4. Mine is as sharp at f/4 as my old 135L was at f/4. Not kidding.

These are both at ISO 1600 and f/4:

IMAGE: http://www.jordansteele.com/forumlinks/asu-1.jpg

IMAGE: http://www.jordansteele.com/forumlinks/asu-2.jpg

This is also at f/4:
IMAGE: http://www.jordansteele.com/images/recent/raccoon1.jpg

100% crop of above:
IMAGE: http://www.jordansteele.com/forumlinks/racoon_crop.jpg

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gjl711
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Oct 23, 2008 20:47 |  #6

Well, looking at photozone, it looks as if f/5.6 is going to be the sweet spot, but all are very good.
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n1as
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Oct 23, 2008 20:57 |  #7

Oh, you guys are SO WRONG. This lens definitely has a sweet spot.


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I echo what others are saying. It is prickly sharp at f/4. Yea, it gets better stopped down just a but but is it so good at f/4 that there is no reason to not shoot wide open.


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Jimmer411
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Oct 24, 2008 00:26 |  #8

Razor sharp from f/4 up. From 70 to 200mm and even at mfd!


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picturecrazy
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Oct 24, 2008 00:31 |  #9

if you get the shot in focus, that's the sweet spot. it'll always look nice. :)
the 70-200 series is legendary for a good reason.


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nordstern1
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Oct 24, 2008 01:00 |  #10

to the OP, mine is very sharp too like the others who commented here. dont immediately conclude that the equipment is faulty. can you pls post a sample of the pic/s that you say are unsharp?


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MinhThien
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Oct 24, 2008 01:04 |  #11

Hi Joe!
I will post some F4 2morrow!


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bohdank
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Oct 24, 2008 07:04 |  #12

I pretty much leave mine on f4... that says it all.


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egordon99
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Oct 24, 2008 07:08 as a reply to  @ bohdank's post |  #13

+1

I think once I had it stopped down a bit, but f/4 works for me :)




  
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Daan37
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Oct 24, 2008 07:10 |  #14

f/5.6 over the entire zoom range, but f/4 is no slouch either. Although IS seems to affect sharpness negatively mainly at f/4 at the shorter end of the zoom range. It is sharpest from 100mm to 200mm, with 135mm being sharpest (equally sharp as my 135L at comparable apertures). It suffers from softness and lack of contrast at 200mm MFD (it clears up at 200mm and 2.5 meters shooting distance though).


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TaDa
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Oct 24, 2008 08:11 |  #15

Agreed with the others, mine was sharp at f/4, could cut you at 5.6


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70-200mm f4 IS sweet spot?
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