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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 18 Sep 2011 (Sunday) 19:47
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Canon 15-85mm vs 70-200 f4 is sharpness, Pics inside

 
bpark42
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Sep 19, 2011 13:37 |  #16

walmartmartyr wrote in post #13126919 (external link)
The pics are at slightly different lenghts and slightly different aperatures and different shutter speeds, The 70-200's shutter speed faster cus of the faster f-stop of 4 compared to the 5.6 on the 15-85. Anyway, the 15-85 looks sharper, this was my question, is that possible or do I have something to be concerned about?

If for some reason you really want to compare these two lenses that barely overlap in focal length...

-Start by setting up a tripod.

-Pick a focal length on the first lens and take a shot at low iso with mirror lockup and manual focus via live view at (e.g.) f5.6

-Swap for the second lens without moving the tripod. Set to the same focal length/framing. Take a shot using the same method and aperture.

The test you did tells you very little about the relative performance of the two lenses. There are too many variables and inconsistencies.




  
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walmartmartyr
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Sep 19, 2011 14:03 as a reply to  @ bpark42's post |  #17
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Just look at the sharpness of both! Is one sharper than the other? then if so, the sharper lens is sharper than the other. And im surprised that the 15-85 is sharper than the 70-200 f4 is


Currently Have [Canon 7D] [17-55mm f2.8 IS USM] [70-200 f4L IS USM] [430exII] [50mm f1.8] [Canon s100]
No Longer Have [Canon T2i][Canon Xti][17-85mm IS USM][50mm f1.4 USM][28mm f1.8 USM][15-85mm IS USM]

  
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mattograph
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Sep 19, 2011 14:03 |  #18

walmartmartyr wrote in post #13126919 (external link)
The pics are at slightly different lenghts and slightly different aperatures and different shutter speeds, The 70-200's shutter speed faster cus of the faster f-stop of 4 compared to the 5.6 on the 15-85. Anyway, the 15-85 looks sharper, this was my question, is that possible or do I have something to be concerned about?

Its an $800 variable aperture standard zoom plastic lens. It had damned well better be sharp for that money.

Both of these lenses are fine. Go out and take some pictures and don't worry about it.


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walmartmartyr
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Sep 19, 2011 14:13 |  #19
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mattograph wrote in post #13128269 (external link)
Its an $800 variable aperture standard zoom plastic lens. It had damned well better be sharp for that money.

Both of these lenses are fine. Go out and take some pictures and don't worry about it.

im not worried, just amazed, as I hope others here that read and view this thread, just sharing the wealth.


Currently Have [Canon 7D] [17-55mm f2.8 IS USM] [70-200 f4L IS USM] [430exII] [50mm f1.8] [Canon s100]
No Longer Have [Canon T2i][Canon Xti][17-85mm IS USM][50mm f1.4 USM][28mm f1.8 USM][15-85mm IS USM]

  
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bpark42
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Sep 19, 2011 14:25 |  #20

walmartmartyr wrote in post #13128264 (external link)
Just look at the sharpness of both! Is one sharper than the other? then if so, the sharper lens is sharper than the other. And im surprised that the 15-85 is sharper than the 70-200 f4 is

You have too many variables in your test to make the definitive determination that one lens is sharper than the other.

Either way they are both good lenses. They are primarily complementary vs. competing anyhow, so I am not sure a proper controlled test is warranted.




  
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pilipino ­ photography
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Sep 19, 2011 14:30 |  #21

walmartmartyr wrote in post #13128331 (external link)
im not worried, just amazed, as I hope others here that read and view this thread, just sharing the wealth.

i'm guessin the OP was bored and just wanted to show how sharp his lenses were and instead made everyone think he was trying to compare the two. :neutral:


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Colors
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Sep 19, 2011 14:52 |  #22

Though it is indeed very possible for the 15-85 be sharper than the 70-200, you have to be very wary of the shutter speed on the latter. In my experience, the 70-200 is pretty sharp at f4 but at f5+ it reaches its highest level of performance.


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walmartmartyr
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Sep 19, 2011 15:01 as a reply to  @ Colors's post |  #23
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how do you know where the sharpest fstop is on any particular lens? Besides taking a hundred pics, is there info anywhere?


Currently Have [Canon 7D] [17-55mm f2.8 IS USM] [70-200 f4L IS USM] [430exII] [50mm f1.8] [Canon s100]
No Longer Have [Canon T2i][Canon Xti][17-85mm IS USM][50mm f1.4 USM][28mm f1.8 USM][15-85mm IS USM]

  
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Amamba
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Sep 19, 2011 15:06 |  #24

walmartmartyr wrote in post #13128595 (external link)
how do you know where the sharpest fstop is on any particular lens? Besides taking a hundred pics, is there info anywhere?

MTF charts ?


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walmartmartyr
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Sep 19, 2011 15:11 as a reply to  @ Amamba's post |  #25
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where do i get those?


Currently Have [Canon 7D] [17-55mm f2.8 IS USM] [70-200 f4L IS USM] [430exII] [50mm f1.8] [Canon s100]
No Longer Have [Canon T2i][Canon Xti][17-85mm IS USM][50mm f1.4 USM][28mm f1.8 USM][15-85mm IS USM]

  
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jpjaybird2011
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Sep 19, 2011 15:12 as a reply to  @ Amamba's post |  #26

Look at the MTF tables on
http://www.photozone.d​e …canon_1585_3556​is?start=1 (external link)

where you can look for focal ratio sweet spots at different focal lengths




  
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Colors
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Sep 19, 2011 15:23 |  #27

I'd advise taking your own pictures and reviewing them rather than looking at the results of someone else's lens online.


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msowsun
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Sep 19, 2011 15:50 |  #28

walmartmartyr wrote in post #13128595 (external link)
how do you know where the sharpest fstop is on any particular lens? Besides taking a hundred pics, is there info anywhere?

Image Quality or sharpness varies with both aperture and focal length. The quickest and easiest way to visualize this is with the interactive graphs at SLR Gear:

http://www.slrgear.com​/reviews/showcat.php/c​at/2 (external link)

Just adjust the sliders to see where the lens is best. (purple is good) (blue or red, not so good)

Here is the chart for the 15-85 (a sharp lens): http://www.slrgear.com …15-85f35-56is/tloader.htm (external link)

For comparison, here is the chart older 18-55 which is not as sharp: http://www.slrgear.com …on18-55f35-56/tloader.htm (external link)


Mike Sowsun / SL1 / 80D / EF-S 24mm STM / EF-S 10-18mm STM / EF-S 18-55mm STM / EF-S 15-85mm USM / EF-S 55-250mm STM / 5D3 / Samyang 14mm 2.8 / EF 40mm 2.8 STM / EF 50mm 1.8 STM / EF 100mm 2.0 USM / EF 100mm 2.8 USM Macro / EF 24-105mm IS / EF 70-200mm 2.8L IS Mk II / EF 100-400 II / EF 1.4x II
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walmartmartyr
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Sep 19, 2011 17:29 |  #29
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msowsun wrote in post #13128838 (external link)
Image Quality or sharpness varies with both aperture and focal length. The quickest and easiest way to visualize this is with the interactive graphs at SLR Gear:

http://www.slrgear.com​/reviews/showcat.php/c​at/11 (external link)

Just adjust the sliders to see where the lens is best. (purple is good) (blue or red, not so good)

Here is the chart for the 15-85 (a sharp lens): http://www.slrgear.com …15-85f35-56is/tloader.htm (external link)

For comparison, here is the chart older 18-55 which is not as sharp: http://www.slrgear.com …on18-55f35-56/tloader.htm (external link)

what does the rectangle blue represent? the sensor or picture? so when I see purple at the top or corner, does that mean the lens will be sharpest in the top corner of the frame?


Currently Have [Canon 7D] [17-55mm f2.8 IS USM] [70-200 f4L IS USM] [430exII] [50mm f1.8] [Canon s100]
No Longer Have [Canon T2i][Canon Xti][17-85mm IS USM][50mm f1.4 USM][28mm f1.8 USM][15-85mm IS USM]

  
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msowsun
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Sep 19, 2011 17:46 |  #30

walmartmartyr wrote in post #13129252 (external link)
what does the rectangle blue represent? the sensor or picture? so when I see purple at the top or corner, does that mean the lens will be sharpest in the top corner of the frame?

Which graph are you looking at? and at what focal length and aperture?

The blue rectangle represents the sharpness of the image on the sensor. It is a visual graph that corresponds to which areas of the lens produce the sharpest image. Notice that the corners are generally not as sharp and curl upwards and change color.

A really sharp lens will have one solid purple color near the bottom of the graph like this

IMAGE: http://i2.photobucket.com/albums/y17/msowsun/photo%20stuff/Photo7/_1-10.jpg

A really poor lens, or bad aperture and focal length will look like this
IMAGE: http://i2.photobucket.com/albums/y17/msowsun/photo%20stuff/Photo7/_1a-4.jpg

Mike Sowsun / SL1 / 80D / EF-S 24mm STM / EF-S 10-18mm STM / EF-S 18-55mm STM / EF-S 15-85mm USM / EF-S 55-250mm STM / 5D3 / Samyang 14mm 2.8 / EF 40mm 2.8 STM / EF 50mm 1.8 STM / EF 100mm 2.0 USM / EF 100mm 2.8 USM Macro / EF 24-105mm IS / EF 70-200mm 2.8L IS Mk II / EF 100-400 II / EF 1.4x II
Full Current and Previously Owned Gear List over 40 years Flickr Photostream (external link)

  
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Canon 15-85mm vs 70-200 f4 is sharpness, Pics inside
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