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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 18 Apr 2016 (Monday) 11:09
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Sigma 50-100 1.8..Anyone ordering it?

 
vengence
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Nov 07, 2016 22:47 |  #61

h_scott_a wrote in post #18175243 (external link)
Just curious - what's everybody's MFA numbers with this lens & the USB dock?

On a 7DII mine seem fairly small except for the 4ft distance.

3.12ft
50/60/85/100 all +1

4 ft
50 +6, 60 +5, 85 +3, 100 +1

6.25 ft
50 -1, 60/85/100 all +1

infinity
50/60/85 0, 100 -1

Also, infinity focus doesn't seem to be as consistent as the shorter ranges.

How do you find the focus consistency with the 18-35 on the 7d ii. I've owned or tried a couple of the sigma primes with a few different canon bodies and have always felt unease because of the inconsistent focus. It was of course simply amazing when they nailed focus, even wide open, but the sheer amount of complete AF misses was too high for me to have any faith to pull them out of my bag.




  
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Ah-keong
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Nov 08, 2016 01:28 |  #62

vengence wrote in post #18178890 (external link)
How do you find the focus consistency with the 18-35 on the 7d ii. I've owned or tried a couple of the sigma primes with a few different canon bodies and have always felt unease because of the inconsistent focus. It was of course simply amazing when they nailed focus, even wide open, but the sheer amount of complete AF misses was too high for me to have any faith to pull them out of my bag.

I experience some inability to focus using spot AF point with AI servo with the 18-35 on the 7d ii say 1 / 10 shots.
Currently I am using single or 4-pt expansion point and with AI servo and somehow it reduces to say 5 / 100 shots.

another setting I used is set 1st shot to "Release" priority and 2nd shot to "Focus" priority.

last setting I used is I configure AF-ON button for "AI Servo" and * button for "One-Shot" focusing.


Canon 7D Mark II | BG-E16 | Canon EF-S 10-18mm | Sigma DC 18-35mm ART | Canon EF 70-200mm f/2,8L IS II | Zeiss Makro-Planar T* 2/100mm ZE | Zeiss Distagon T* 2/35mm ZE
Canon Speedlite 430EX III-RT | 600EX-RT
Olympus E-PL3 | M.Zuiko ED 7-14mm PRO
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Ah-keong
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Nov 08, 2016 01:30 |  #63

smythie wrote in post #18178763 (external link)
I would only use that screen if planning on manually focussing a lot when shooting through the viewfinder. It is not needed for autofocus (this screen is above the mirror while all of the autofocus stuff happens underneath the mirror)

I read somewhere it is useful for f/1.8 to f/2.8 range with fine microlens for the AF?

:D


Canon 7D Mark II | BG-E16 | Canon EF-S 10-18mm | Sigma DC 18-35mm ART | Canon EF 70-200mm f/2,8L IS II | Zeiss Makro-Planar T* 2/100mm ZE | Zeiss Distagon T* 2/35mm ZE
Canon Speedlite 430EX III-RT | 600EX-RT
Olympus E-PL3 | M.Zuiko ED 7-14mm PRO
Manfrotto BeFree Travel Tripod |

  
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vengence
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Nov 08, 2016 12:47 |  #64

Ah-keong wrote in post #18178969 (external link)
I experience some inability to focus using spot AF point with AI servo with the 18-35 on the 7d ii say 1 / 10 shots.
Currently I am using single or 4-pt expansion point and with AI servo and somehow it reduces to say 5 / 100 shots.

another setting I used is set 1st shot to "Release" priority and 2nd shot to "Focus" priority.

last setting I used is I configure AF-ON button for "AI Servo" and * button for "One-Shot" focusing.

Thanks!




  
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mwsilver
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Post edited over 1 year ago by mwsilver. (3 edits in all)
     
Nov 09, 2016 11:11 |  #65

Ah-keong wrote in post #18178970 (external link)
I read somewhere it is useful for f/1.8 to f/2.8 range with fine microlens for the AF?

:D

I don't know what you mean by fine microlens, but the high precision matte focus screen is intended for manually focusing lenses f/2.8 and wider. Do you mean using one in conjunction with micro focus adjustments? I don't see how it would help there. I don't believe it serves that or any other purpose other than aiding MF for fast lenses. The downside is that when using slower lenses, especially those with a variable aperture of f/3.5-5.6, the viewfinder will be much much darker, especially indoors. In very low light.you may have difficulty seeing your subject with a slower lens. Since it doesn't use a split prism, even with a super precision screen I find manual focus somewhat difficult with often inaccurate results.

When I manual focus it's usually with my camera on a tripod. I use the magnification feature of the LCD screen which makes manual focus easy and accurate. The longer the throw of the lenses focus ring, the more accurate the results. I used a super precision matte screen on my 60D with fast primes but found it wasn't very convenient or accurate enough for consistent manual focus, especially in low light. I went back to the standard screen. I opted not to get one for my 7D Mark II.


Mark
Canon 7D2, 60D, T3i, T2i, Sigma 18-35 f/1.8, 30 f/1.4. Canon EF 70-200 L f/4 IS, EF 35 f/2 IS, EFs 10-18 STM, EFs 15-85, EFs 18-200, EF 50 f/1.8 STM, Tamron 18-270 PZD, B+W MRC CPL, Canon 320EX, Vanguard Alta Pro 254CT & SBH 250 head. RODE Stereo Videomic Pro, DXO PhotoLab, Elements 15

  
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mwsilver
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Post edited over 1 year ago by mwsilver.
     
Nov 09, 2016 11:32 |  #66

Ah-keong wrote in post #18178969 (external link)
I experience some inability to focus using spot AF point with AI servo with the 18-35 on the 7d ii say 1 / 10 shots.
Currently I am using single or 4-pt expansion point and with AI servo and somehow it reduces to say 5 / 100 shots.

another setting I used is set 1st shot to "Release" priority and 2nd shot to "Focus" priority.

last setting I used is I configure AF-ON button for "AI Servo" and * button for "One-Shot" focusing.

The AF is sometimes inconsistent, but over time with familiarity with this lens' idiosyncrasies, I find my keeper rate has gone up significantly. Shooting f/1.8 and getting keepers a high percentage of the time can be difficult with any fast lens if your technique is not first rate and can be exacerbated by the size, distance, ambient light, and contrast of the subject. I also assume that you are not attempting to shoot this lens wide open at high speed. This is strictly a one shot as a time lens at f/1.8 -2.8.


Mark
Canon 7D2, 60D, T3i, T2i, Sigma 18-35 f/1.8, 30 f/1.4. Canon EF 70-200 L f/4 IS, EF 35 f/2 IS, EFs 10-18 STM, EFs 15-85, EFs 18-200, EF 50 f/1.8 STM, Tamron 18-270 PZD, B+W MRC CPL, Canon 320EX, Vanguard Alta Pro 254CT & SBH 250 head. RODE Stereo Videomic Pro, DXO PhotoLab, Elements 15

  
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vengence
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Nov 10, 2016 11:37 |  #67

mwsilver wrote in post #18180091 (external link)
The AF is sometimes inconsistent, but over time with familiarity with this lens' idiosyncrasies, I find my keeper rate has gone up significantly. Shooting f/1.8 and getting keepers a high percentage of the time can be difficult with any fast lens if your technique is not first rate and can be exacerbated by the size, distance, ambient light, and contrast of the subject. I also assume that you are not attempting to shoot this lens wide open at high speed. This is strictly a one shot as a time lens at f/1.8 -2.8.

This is unfortunate as one of my primary uses involves AI servo bursts. :(




  
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Ah-keong
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Nov 10, 2016 20:22 |  #68

mwsilver wrote in post #18180081 (external link)
I don't know what you mean by fine microlens, but the high precision matte focus screen is intended for manually focusing lenses f/2.8 and wider. Do you mean using one in conjunction with micro focus adjustments? I don't see how it would help there. I don't believe it serves that or any other purpose other than aiding MF for fast lenses. The downside is that when using slower lenses, especially those with a variable aperture of f/3.5-5.6, the viewfinder will be much much darker, especially indoors. In very low light.you may have difficulty seeing your subject with a slower lens. Since it doesn't use a split prism, even with a super precision screen I find manual focus somewhat difficult with often inaccurate results.

When I manual focus it's usually with my camera on a tripod. I use the magnification feature of the LCD screen which makes manual focus easy and accurate. The longer the throw of the lenses focus ring, the more accurate the results. I used a super precision matte screen on my 60D with fast primes but found it wasn't very convenient or accurate enough for consistent manual focus, especially in low light. I went back to the standard screen. I opted not to get one for my 7D Mark II.

I thought the super precision matte screen is designed for Canon APS-C bodies to help in the AF for Aperture below f/2.8 (Canon EF prime lens). In this case, it would be beneficial for the Sigma 50-100mm as Nikon/Canon does not have native glass below f/2.8 for cropped bodies.

But from your experience, there is not much help in the changing of the focusing screen. Thanks!


Canon 7D Mark II | BG-E16 | Canon EF-S 10-18mm | Sigma DC 18-35mm ART | Canon EF 70-200mm f/2,8L IS II | Zeiss Makro-Planar T* 2/100mm ZE | Zeiss Distagon T* 2/35mm ZE
Canon Speedlite 430EX III-RT | 600EX-RT
Olympus E-PL3 | M.Zuiko ED 7-14mm PRO
Manfrotto BeFree Travel Tripod |

  
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Ah-keong
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Nov 10, 2016 20:24 |  #69

mwsilver wrote in post #18180091 (external link)
The AF is sometimes inconsistent, but over time with familiarity with this lens' idiosyncrasies, I find my keeper rate has gone up significantly. Shooting f/1.8 and getting keepers a high percentage of the time can be difficult with any fast lens if your technique is not first rate and can be exacerbated by the size, distance, ambient light, and contrast of the subject. I also assume that you are not attempting to shoot this lens wide open at high speed. This is strictly a one shot as a time lens at f/1.8 -2.8.

looks like I have to work on my technique if I am gonna use this for action applications like indoor sports. :D


Canon 7D Mark II | BG-E16 | Canon EF-S 10-18mm | Sigma DC 18-35mm ART | Canon EF 70-200mm f/2,8L IS II | Zeiss Makro-Planar T* 2/100mm ZE | Zeiss Distagon T* 2/35mm ZE
Canon Speedlite 430EX III-RT | 600EX-RT
Olympus E-PL3 | M.Zuiko ED 7-14mm PRO
Manfrotto BeFree Travel Tripod |

  
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Ah-keong
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Nov 10, 2016 20:30 |  #70

vengence wrote in post #18180910 (external link)
This is unfortunate as one of my primary uses involves AI servo bursts. :(

same here, I am considering this glass for action applications, indoor sports and maybe also double up for portraits.

Now, I have to consider either:

1) 3 primes (50mm f/1.8, 85mm f/1.8, 100mm f/2.0
2) 70-200 f/2.8L IS USM II

tradeoffs give me headache....


Canon 7D Mark II | BG-E16 | Canon EF-S 10-18mm | Sigma DC 18-35mm ART | Canon EF 70-200mm f/2,8L IS II | Zeiss Makro-Planar T* 2/100mm ZE | Zeiss Distagon T* 2/35mm ZE
Canon Speedlite 430EX III-RT | 600EX-RT
Olympus E-PL3 | M.Zuiko ED 7-14mm PRO
Manfrotto BeFree Travel Tripod |

  
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smythie
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Nov 10, 2016 21:54 |  #71

Ah-keong wrote in post #18181298 (external link)
I thought the super precision matte screen is designed for Canon APS-C bodies to help in the AF for Aperture below f/2.8 (Canon EF prime lens). In this case, it would be beneficial for the Sigma 50-100mm as Nikon/Canon does not have native glass below f/2.8 for cropped bodies.

But from your experience, there is not much help in the changing of the focusing screen. Thanks!

The focussing screen is not in the light path for auto focus. It will not affect AF at all either good or bad.

The mirror splits the light coming into the body from the lens, much being reflected upwards through the focussing screen, into the pentamirror/pentaprism and onto the eyepiece. The remainder of the light is split downwards towards the baseplate of the camera where the AF module resides.


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Ah-keong
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Nov 10, 2016 22:10 |  #72

smythie wrote in post #18181361 (external link)
The focussing screen is not in the light path for auto focus. It will not affect AF at all either good or bad.

The mirror splits the light coming into the body from the lens, much being reflected upwards through the focussing screen, into the pentamirror/pentaprism and onto the eyepiece. The remainder of the light is split downwards towards the baseplate of the camera where the AF module resides.

I see, so the focusing screen is for MF via the OVF. Now it make sense. :D
Thank you!


Canon 7D Mark II | BG-E16 | Canon EF-S 10-18mm | Sigma DC 18-35mm ART | Canon EF 70-200mm f/2,8L IS II | Zeiss Makro-Planar T* 2/100mm ZE | Zeiss Distagon T* 2/35mm ZE
Canon Speedlite 430EX III-RT | 600EX-RT
Olympus E-PL3 | M.Zuiko ED 7-14mm PRO
Manfrotto BeFree Travel Tripod |

  
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smythie
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Nov 10, 2016 22:14 |  #73

Your welcome.


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mwsilver
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Post edited over 1 year ago by mwsilver.
     
Nov 11, 2016 01:24 |  #74

Ah-keong wrote in post #18181298 (external link)
I thought the super precision matte screen is designed for Canon APS-C bodies to help in the AF for Aperture below f/2.8 (Canon EF prime lens). In this case, it would be beneficial for the Sigma 50-100mm as Nikon/Canon does not have native glass below f/2.8 for cropped bodies.

But from your experience, there is not much help in the changing of the focusing screen. Thanks!

The super precision matte screen is only intended for MF. It does not in any way enhance AF.

This is the description from B&H:

"Optimized for wide-aperture lenses, specifically in the f/1.8 - 2.8 range, this Eh-S Super Precision Matte Focusing Screen from Canon is designed to obtain sharp points of focus with their EOS 7D Mark II DSLR Camera. It's especially well-suited to situations in which you're manually focusing in dim light with fast lenses, and its fine microlens structure allows for high performance in various scenes.

Areas that are slightly out of focus will appear more so, making it easier to tell when focus is right-on. With lenses that have a maximum aperture smaller than f/2.8, a Super Precision Matte screen will appear dark and grainy. Like all Canon focusing screens, this one is compatible with EOS autofocus systems."


Its overall description may have confused you a bit, but its only purpose for existing is for precision manual focusing with fast lenses. Note it only says its compatible with AF systems.


Mark
Canon 7D2, 60D, T3i, T2i, Sigma 18-35 f/1.8, 30 f/1.4. Canon EF 70-200 L f/4 IS, EF 35 f/2 IS, EFs 10-18 STM, EFs 15-85, EFs 18-200, EF 50 f/1.8 STM, Tamron 18-270 PZD, B+W MRC CPL, Canon 320EX, Vanguard Alta Pro 254CT & SBH 250 head. RODE Stereo Videomic Pro, DXO PhotoLab, Elements 15

  
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mwsilver
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Post edited over 1 year ago by mwsilver. (2 edits in all)
     
Nov 11, 2016 01:28 |  #75

Ah-keong wrote in post #18181300 (external link)
looks like I have to work on my technique if I am gonna use this for action applications like indoor sports. :D

Not necessarily. There are more AF inconsistencies than there should be. But I find with great care, my keeper rate is much better. But I think that shooting high speed at f/1.8 with this lens will result in very few keepers. If you are going to shoot bursts stop down to at least f/2.8 to f/4 to improve your keeper rate


Mark
Canon 7D2, 60D, T3i, T2i, Sigma 18-35 f/1.8, 30 f/1.4. Canon EF 70-200 L f/4 IS, EF 35 f/2 IS, EFs 10-18 STM, EFs 15-85, EFs 18-200, EF 50 f/1.8 STM, Tamron 18-270 PZD, B+W MRC CPL, Canon 320EX, Vanguard Alta Pro 254CT & SBH 250 head. RODE Stereo Videomic Pro, DXO PhotoLab, Elements 15

  
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Sigma 50-100 1.8..Anyone ordering it?
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