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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 04 Nov 2010 (Thursday) 22:30
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that is sharp. wait, do i know what sharp is?

 
SaxonIV
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Nov 04, 2010 22:30 |  #1

here is a picture, 40D with a 70-200 f/4 at 122 mm

IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/gif' | Redirected to error image by FLICKR

IMG_2805 (external link) by saxonfsu (external link), on Flickr

shot at 1/1600th of a second, f/4 and iso 400. shot as jpg. completely as it came out of the camera and cropped to show a 100 % clip of the center of the image, where i was focusing.

is this image sharp? would like to have a little bit of discussion as to what sharp is. would be nice to have somewhere to compare things. im new at good glass and just not sure where to start.



  
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itzcryptic
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Nov 04, 2010 22:45 |  #2

Looks OK, not tack sharp. Compression may have lost a little quality. It's at F4 so the lens will get sharper as you stop down.




  
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996gt2
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Nov 04, 2010 23:02 |  #3

Looks OK but not as sharp as some primes (like the 100 Macro, for example). The f/4 L sharpens up a tad at f/5.6.


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akadmon
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Nov 04, 2010 23:11 |  #4

Looks soft to me. Then again if this was not shot off a tripod all bets are off. Could be just camera shake.


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SaxonIV
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Nov 04, 2010 23:16 |  #5

camera shake at 1/1600th of a second? is that possible? i thought all shake was eliminated at about 1/500th




  
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akadmon
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Nov 04, 2010 23:17 |  #6

SaxonIV wrote in post #11227739 (external link)
camera shake at 1/1600th of a second? is that possible? i thought all shake was eliminated at about 1/500th

Oops, missed that:oops:


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XFaega
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Nov 05, 2010 00:07 |  #7

Picture looks slightly out of focus. Since your lens is non IS try using a tripod. Also notice that your focal length was 122mm so ya you will need a tripod for best results.


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LamontSanders
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Nov 05, 2010 00:31 |  #8

not sharp. it happens to the best of us.


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turkleten
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Nov 05, 2010 01:14 |  #9

XFaega wrote in post #11228008 (external link)
Picture looks slightly out of focus. Since your lens is non IS try using a tripod. Also notice that your focal length was 122mm so ya you will need a tripod for best results.

A tripod is not necessary at the given focal length and shutter speed.

Do you have a cheap filter attached?


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SaxonIV
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Nov 05, 2010 08:29 |  #10

turkleten wrote in post #11228275 (external link)
A tripod is not necessary at the given focal length and shutter speed.

Do you have a cheap filter attached?

Yes indeed i did. i had a cheap $3.50 zuikos lens filter i bought from ebay. would they really cause a loss of sharpness? (lets not start a debate) but maybe ill shoot some example shots with and without.

its really only on there because i dont have a lens cap yet.

looks like i need to stop buying lenses and keep up with the ones i have haha.




  
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mckinleypics
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Nov 05, 2010 08:34 |  #11

If you put a 3 dollar filter on a 70-200 f4, you may be in violation of several laws, depending on the state your in. You may as well be using Vaseline to clean your lenses.

Try it again with no filter. Also, if you really want to see sharp, stop it down to 5.6, put it on a tripod, use live view and zoom into the max, then manual focus. Then use a remote shutter release or a 10 second delay.


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Mundty
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Nov 05, 2010 08:46 |  #12

Seems like there's some artifact/noise in the image. Can you post the original with EXIF in tact?

Looks dull for the 70-200f/4, while not as sharp as the IS version, this shot looks like a P&S shot.


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hieu1004
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Nov 05, 2010 09:06 |  #13

Hm, I echo the others...looks a little out of focus.


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nikmar08
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Nov 05, 2010 12:21 |  #14

996gt2 wrote in post #11227646 (external link)
Looks OK but not as sharp as some primes (like the 100 Macro, for example). The f/4 L sharpens up a tad at f/5.6.

mckinleypics wrote in post #11229331 (external link)
...Also, if you really want to see sharp, stop it down to 5.6, put it on a tripod, use live view and zoom into the max, then manual focus. Then use a remote shutter release or a 10 second delay.

Would this forum agree to this requirement for the 70-200 F/4 L IS version as well? I mean even after spending a grand, if the widest aperture to get sharp pics is only going to be 5.6, then I will feel stupid to spend that much money. Seriously, 5.6 does not give me enough speed and bokeh for my liking with my 70-300; well I am not comparing the two lenses, they are like apples and oranges, I am only comparing the speed and bokeh!!

To extend this further, does the 70-200 F/2.8 L IS mkII also need to be stopped down to 4 to get a tack sharp pic? That would be ridiculous, eh!!


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50Ddude
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Nov 05, 2010 12:25 |  #15

mckinleypics wrote in post #11229331 (external link)
Try it again with no filter. Also, if you really want to see sharp, stop it down to 5.6, put it on a tripod, use live view and zoom into the max, then manual focus. Then use a remote shutter release or a 10 second delay.

hmm I'll give that a try myself!




  
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