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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 16 Jul 2012 (Monday) 05:36
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100-400mm - sharpest Aperture

 
markisclueless
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Jul 16, 2012 05:36 |  #1

Hi, question for all 100-400 owners, please indicate at what aperture you found your lense to have the sharpest IQ ...
Read in various threads that it is around 7.1 or 8.0 ...
2nd question, I generally shoot Avian with the following settings:

Shutter Priority = 1/1250
Iso = 800 or lower (however light dependant)
Spot Metering
AF = Centre spot/point
The resulting aperture is around 5.1/5.6, question is if I decrease the SS to say 1/500 it should increase the aperture right (keeping light conditions similar) ?
thanks


Canon 7D mk2 | Canon 100-400mm f4.5-5.6L IS II | Canon 400mm DO IS II

  
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sambarino
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Jul 16, 2012 06:47 |  #2

I have no IQ complaints about my 100-400L at any aperture, at any focal length. It beats the pants off of the 70-300 I sold to help with the upgrade. edit: Thanks, ZoneV. I forgot about filters. DO NOT PUT A UV/HAZE/PROTECTION FILTER ON THIS LENS!.




  
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ZoneV
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Jul 16, 2012 06:50 |  #3

In case you use a filter and wonder at which aperture the lens works best, try without filter :-)
Should be stated in the owner manuals - this lens shows bad filter quality.


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Lowner
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Jul 16, 2012 07:45 |  #4

According to information I have (sadly I don't have a link), at 100mm the best aperture is f/32, at 250mm its f/8 and at 400mm its f/32 again. Thats at the centre of the image circle.

So for the edge: At 100mm its between f/11 and f/16, at 250mm its f/32 and at 400mm its again f/32.


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bob_r
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Jul 16, 2012 08:50 |  #5

Photozone.de's review states: MTF (resolution & chromatic aberrations)
Two lenses have been tested - the first one showed a rather mediocre quality whereas the second one (its results are shown below) performed pretty much according to the "consensus". The lens exhibits a very even performance throughout the zoom range. At 100mm the resolution figures are very good straight from f/4.5 and increase to excellent results by f/8. Unsurprisingly there's a slight decrease in performance towards 400mm where the quality is still on a very good level."

Their tests show the performance degrades by f/11. I don't know where Richard got that information, but I believe lens diffraction would certainly be a factor at aperture settings smaller than f/16.
I normally shoot mine wide open with good results.

OP, reducing the shutter speed using shutter priority will allow a smaller aperture setting in the same lighting conditions.


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gabebalazs
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Jul 16, 2012 09:37 |  #6

I used mine most often at f/6.3. It was pretty sharp wide open but 6.3 was the sweet spot. I only went to f/8 if I wanted a deeper depth of field.
I had a very good copy.


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Snydremark
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Jul 16, 2012 09:50 |  #7

I shoot birds, regularly, and simply leave it wide open (@f/5.6) and I have zero complaints about sharpness or clarity. If there's just too much light, I'll stop down to f/8, but those are the only aperture settings I use with that lens


- Eric S.: My Birds/Wildlife (external link) (7D MkII/5D IV, Canon 10-22 f/3.5-4.5, Canon 24-105L f/4 IS, Canon 70-200L f/2.8 IS MkII, Canon 100-400L f/4.5-5.6 IS I/II)
"The easiest way to improve your photos is to adjust the loose nut between the shutter release and the ground."

  
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bobbyz
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Jul 16, 2012 11:00 |  #8

There is a difference at f5.6 vs f7.1 even f6.7. Now only lens where I couldn't see difference at f5.6 vs f8 was 400mm f5.6.


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watt100
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Jul 16, 2012 18:23 |  #9

markisclueless wrote in post #14722895 (external link)
Hi, question for all 100-400 owners, please indicate at what aperture you found your lense to have the sharpest IQ ...
Read in various threads that it is around 7.1 or 8.0 ...
2nd question, I generally shoot Avian with the following settings:

Shutter Priority = 1/1250
Iso = 800 or lower (however light dependant)
Spot Metering
AF = Centre spot/point
The resulting aperture is around 5.1/5.6, question is if I decrease the SS to say 1/500 it should increase the aperture right (keeping light conditions similar) ?
thanks


I wouldn't worry too much about the sharpest aperture, whether it's 7.1 or 8.0 or 6.3 or f5.6 they are all sharp




  
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ed ­ rader
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Jul 16, 2012 18:46 |  #10

markisclueless wrote in post #14722895 (external link)
=markisclueless;147228​95]Hi, question for all 100-400 owners, please indicate at what aperture you found your lense to have the sharpest IQ ...
Read in various threads that it is around 7.1 or 8.0 ...
2nd question, I generally shoot Avian with the following settings:

Shutter Priority = 1/1250
Iso = 800 or lower (however light dependant)
Spot Metering
AF = Centre spot/point
The resulting aperture is around 5.1/5.6, question is if I decrease the SS to say 1/500 it should increase the aperture right (keeping light conditions similar) ?
thanks

f8 but i would not hesitate to shoot wide open.

ed


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watt100
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Jul 16, 2012 18:50 |  #11

ed rader wrote in post #14726218 (external link)
f8 but i would not hesitate to shoot wide open.

ed

I also don't hesitate to shoot wide open


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markisclueless
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Jul 17, 2012 01:01 |  #12

thanks all .... agree also on UV filters - as my lense is VERY new, how does everyone go about cleaning their lense/s .... I shoot often near the coast and worried about salt air (guess I am being stupid but this is my best lense by far to-date)


Canon 7D mk2 | Canon 100-400mm f4.5-5.6L IS II | Canon 400mm DO IS II

  
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Snydremark
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Jul 17, 2012 01:13 |  #13

If it actually gets sea spray on it, I use a blower to get any grains off and then use a dedicated cleaning solution and a microfiber cloth. That's served me well for 4 years, so far.


- Eric S.: My Birds/Wildlife (external link) (7D MkII/5D IV, Canon 10-22 f/3.5-4.5, Canon 24-105L f/4 IS, Canon 70-200L f/2.8 IS MkII, Canon 100-400L f/4.5-5.6 IS I/II)
"The easiest way to improve your photos is to adjust the loose nut between the shutter release and the ground."

  
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markisclueless
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Jul 17, 2012 02:31 |  #14

Snydremark wrote in post #14727710 (external link)
If it actually gets sea spray on it, I use a blower to get any grains off and then use a dedicated cleaning solution and a microfiber cloth. That's served me well for 4 years, so far.

thanks, wonder if I can get same solution in South Africa - which brand do you use ?


Canon 7D mk2 | Canon 100-400mm f4.5-5.6L IS II | Canon 400mm DO IS II

  
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hollis_f
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Jul 17, 2012 04:58 |  #15

markisclueless wrote in post #14727890 (external link)
thanks, wonder if I can get same solution in South Africa - which brand do you use ?

Almost all of these 'specialist' cleaning solutions are a mixture of water and isopropanol. Some will have a bit of ammonia, some will have a bit of soap added.

You can buy 500ml of isopropanol (external link) (also known as IPA, Propan-2-ol, isopropyl alcohol) in the UK for less than ten quid. Dilute that 1:1 with distilled water and you have enough cleaning solution to last the rest of your life. If you make it up in small (100ml) batches you can add a few drops of dish-washing liquid.


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100-400mm - sharpest Aperture
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