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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 19 Jul 2014 (Saturday) 17:23
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sharpest F stop setting for 17-40L

 
PrinceAbubu
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Jul 19, 2014 17:23 |  #1

Hi All,

What do you think is your sharpest F stop setting for this lense?

please share!

thanks..


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gonzogolf
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Jul 19, 2014 17:30 |  #2

Most lenses are sharpest a couple stops down from wide open. For the 17-40 its probably f8.




  
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PrinceAbubu
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Jul 19, 2014 17:33 |  #3

gonzogolf wrote in post #17042430 (external link)
Most lenses are sharpest a couple stops down from wide open. For the 17-40 its probably f8.

Thanks... didnt know that rule.


Canon 6D | 17-40 F4 L | 70-200 F2.8 L | 50 1.4 | | 430EX II Flash | Olympus OM-D E-M10 14-42mm kit lens | Sony A5000 with 16-50mm kit | Velbon Sherpa 600R | Manfrotto Monopod 790B | Naneu Pro urbangear U30 |Lowe Pro Flipside 200 | Toploader pro 75AW | wish list Fujifilm XT1 with 35mm f2 | (goneski) 1DsMk1, 450D with 18-200mm, 40mm stm

  
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gonzogolf
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Jul 19, 2014 17:35 |  #4

PrinceAbubu wrote in post #17042439 (external link)
Thanks... didnt know that rule.

Its not hard and fast, but wide open is rarely the sharpest and then it gets better after you stop down a bit and then stabilizes f until you reach the point where diffraction begins to cause issues




  
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gjl711
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Jul 19, 2014 18:04 |  #5

Looks like the 17-40 is sharpest at f/5.6 across all zoom ranges.
http://www.photozone.d​e …7-canon_1740_4_5d?start=​1 (external link)


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2ndviolinman
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Jul 19, 2014 22:50 |  #6

It may be sharpest in the center at f5.6, but full frame corners are useless until f11.


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gjl711
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Jul 19, 2014 23:02 |  #7

2ndviolinman wrote in post #17042926 (external link)
It may be sharpest in the center at f5.6, but full frame corners are useless until f11.

Only at 17mm. By 20mm it's f/8 and by 28 it really doesn't matter


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Bonbridge
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Jul 20, 2014 04:30 |  #8

f/8.0 is also my go to aperture with this lens.


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Lowner
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Jul 20, 2014 04:42 |  #9

I always assume f/8 whatever lens I'm using.


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Lombardi
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Jul 23, 2014 00:58 |  #10

Did not tried it in a scientific way, but used it at f8 or f11 and was pleased with the results.


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Paulowen
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Jul 23, 2014 02:17 as a reply to  @ Lombardi's post |  #11

between f11 and f16 on my copy - corners are then nice and sharp :)


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zarray
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Jul 23, 2014 03:38 as a reply to  @ Paulowen's post |  #12

for my practical use, I go for f8 +- 1 stop. I will go wide open if necessary, and f18 for starburst effects


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PrinceAbubu
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Jul 23, 2014 04:49 |  #13

awesome tips here.. thanks guys! i normally just sit around the 5.6 area...


Canon 6D | 17-40 F4 L | 70-200 F2.8 L | 50 1.4 | | 430EX II Flash | Olympus OM-D E-M10 14-42mm kit lens | Sony A5000 with 16-50mm kit | Velbon Sherpa 600R | Manfrotto Monopod 790B | Naneu Pro urbangear U30 |Lowe Pro Flipside 200 | Toploader pro 75AW | wish list Fujifilm XT1 with 35mm f2 | (goneski) 1DsMk1, 450D with 18-200mm, 40mm stm

  
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snapperz
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Jul 23, 2014 06:19 |  #14

On 1.6 crop f5.6 is plenty sharp across the frame.
On 1.3 crop f8 cuts out the soft corners, sharpens up the remainder across the frame.
On FF f11-f13 is needed to produce acceptable extreme corners on my copy-still not perfect but good enough for most purposes IMO.


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Eddie
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Jul 23, 2014 06:33 |  #15

On my first 2 copies I was convinced f/11 was sharper than f/8 at 17mm. On this copy as its fairly new to me I haven't decided yet so find myself using both f/8 and f/11 at times.

I prefer using f/11 at 17mm though as I know I can set my focus manually at the 1m mark and have infinity focus


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sharpest F stop setting for 17-40L
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