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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 25 Nov 2007 (Sunday) 18:29
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question on 100-400L sharpness? should I have it repaired

 
tekkie
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Nov 25, 2007 18:29 |  #1

Sorry I know there are a gazillion threads on this already :(

I have had this lens since Jan and it seems to be less sharp to me now than it was when I first got it, at 400mm at least, I use it at that 90% of the time. I have been debating for months if I should send it in to be looked at.

these are all 100% crops I took today on my 40D, using AI servo, 800 ISO F8 and 400mm

I am positive its not a camera problem I have tried it on my old 20D, a 30D and now this 40D and the same results. These pics below were taken about 10ft away, all the shots were between 1/120 - 1/300 with IS on resting the lens on the ground as I was lying down. If I take far away pics it becomes even more obvious then, if I take pics of things from a few hundread feet away its just never sharp, not even as sharp as these ones below.

but I am wondering if I am just being to picky or if its really a problem

would you send it in to be looked at?

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here is a pic of the one above, looks good until you crop it
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Canon 1DMKII, 7D, 5DMKII, 1D MKII
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Mike55
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Nov 25, 2007 18:46 |  #2

The full size pic looks really nice. I think the moral of the story is if you want to crop, get a prime. My 70-300 has the same issues, and I think all zooms have issues with rendering small images that take up less than a quarter of the frame in sharp fashion (and even primes). I never crop with it unless I'm at f8.

So get closer with 400, or get a 1.4x.


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Keith ­ R
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Nov 25, 2007 19:05 |  #3

A prime won't make that much difference - I've seen crops from the 400 f/5.6 that didn't look this good.

800 ISO will cost you detail, even from the 40D, and - frankly - are you ever going to want 100% crops?

The shot of the entire bird has plenty of feather detail in it, and - given that this is more likely a "real world" use of the lens - I really don't see a problem.




  
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Dannydoo
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Nov 25, 2007 19:10 as a reply to  @ Keith R's post |  #4

Looks plenty sharp to me


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tekkie
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Nov 25, 2007 19:11 |  #5

alright so I am just anal :(


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PetKal
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Nov 25, 2007 19:12 |  #6

tekkie wrote in post #4383791 (external link)
here is a pic of the one above, looks good until you crop it

That's a typical 100-400 for ya.
Gotta postprocess the shots, sharpen them, increase contrast, etc.
However, some copies are much better than others though. Yours looks OK.

Generally, the 400 f/5.6 prime is a sharper lens at all apertures, but it ain't a zoom and no IS.
So you take your pick.


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ed ­ rader
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Nov 25, 2007 19:13 |  #7

Mike55 wrote in post #4383912 (external link)
The full size pic looks really nice. I think the moral of the story is if you want to crop, get a prime. My 70-300 has the same issues, and I think all zooms have issues with rendering small images that take up less than a quarter of the frame in sharp fashion (and even primes). I never crop with it unless I'm at f8.

So get closer with 400, or get a 1.4x.

i took this one with the 100-400L and 30d. it's a 100% crop shot @ 400mm and f7.1 (about 1/10 of a frame) converted from raw to jpeg with no PP.


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ed rader

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tekkie
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Nov 25, 2007 19:15 |  #8

yeah thats what I was thinking, I have seen others 100% crops and they look better than mine

I am really thinking of picking up the 400 prime, I went to order it on amazon and its oos otherwise it would be on its way... which is probably a good thing in one way lol


Canon 1DMKII, 7D, 5DMKII, 1D MKII
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tekkie
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Nov 25, 2007 19:16 |  #9

ed rader wrote in post #4384084 (external link)
i took this one with the 100-400L and 30d. it's a 100% crop shot @ 400mm and f7.1 (about 1/10 of a frame) converted from raw to jpeg with no PP.


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ed rader

now thats more like what I am expect


Canon 1DMKII, 7D, 5DMKII, 1D MKII
Canon 500L, 100-400L
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ed ­ rader
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Nov 25, 2007 19:25 as a reply to  @ tekkie's post |  #10

@ 400mm and f6.3....what about a 20th of a frame?

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ed rader

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5D4, 80d, 16-35L F4 IS, 24-70L II, 70-200L F4 IS II, 100-400L II, sigma 15 FE, sigma 14 f1.8 art, tc 1.4 III, 430exII, gitzo 3542L + markins Q20, gitzo GT 1545T + markins Q3T, gitzo GM4562

  
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Collin85
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Nov 25, 2007 19:31 |  #11

ed rader wrote in post #4384084 (external link)
i took this one with the 100-400L and 30d. it's a 100% crop shot @ 400mm and f7.1 (about 1/10 of a frame) converted from raw to jpeg with no PP.


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ed rader

Damn that thing is ugly, Ed. :confused::lol:


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ed ­ rader
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Nov 25, 2007 19:37 |  #12

Collin85 wrote in post #4384195 (external link)
Damn that thing is ugly, Ed. :confused::lol:

we were looking at close-ups of the lemur and my wife the biologist says it probably has some sort of skin disease ......

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ed rader

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5D4, 80d, 16-35L F4 IS, 24-70L II, 70-200L F4 IS II, 100-400L II, sigma 15 FE, sigma 14 f1.8 art, tc 1.4 III, 430exII, gitzo 3542L + markins Q20, gitzo GT 1545T + markins Q3T, gitzo GM4562

  
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Grentz
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Nov 25, 2007 21:04 |  #13

Well, here are some from mine for comparison. All were shot in RAW, converted in lightroom (which applies a bit of sharpening (25)) and then exported to jpg.

375mm ISO1250 1/400 f/5.6 (handheld w/IS)

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100% Crop of Above
IMAGE: http://img122.imageshack.us/img122/6571/img17833gr5.jpg
IMAGE LINK: http://imageshack.us  (external link)

400mm ISO400 1/640 f/8 (the lighthouse was very far away, it was shot with IS and balancing the lens on a fence post)
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100% Crop
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I have gone back and forth with thinking my copy is sharp or not, but in all honestly as long as you do not crop to 100% (which normally you dont anyhow), the pics look great. Also, most lenses will not look amazing when at a 100% crop.

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Mike55
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Nov 25, 2007 21:11 |  #14

The cat shot is excellent. Crisp and organic looking without rough sharpening edges. The lighthouse shot seems like it had a color boost in Lightroom.

These examples make me want to grab the 100-400, unlike most samples I have seen.


6D | 70D | 24-105 L IS | 17-40 L | 300 F4 L IS | 50 1.8 II | 1.4x II | LR5 | HV30 | bug spray | wilderness
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Grentz
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Nov 25, 2007 21:16 |  #15

Sorry, just looked back and the lighthouse did have a very slight color boost. I am still going through the pics from my trip and just forgot that the one had the vibrant color boosted a bit.

The thing seems to be with telephotos that over a long distance you will lose some detail no matter how sharp your copy.


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question on 100-400L sharpness? should I have it repaired
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