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Thread started 20 Nov 2012 (Tuesday) 23:10
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Sigma 35mm f/1.4 DG HSM

 
Sirrith
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Dec 31, 2012 23:12 |  #781

Miltz wrote in post #15429528 (external link)
I did that... Shooting on a flat surface everything is okay.. but for example shoot a person and focusing on their nose tip, I get the lips in focus.

In that case I would say the subject is moving slightly before you press the shutter button. Another possibility is this: the AF points are larger than you'd think, the actual AF sensor area is greater than the size of the box you see in the viewfinder, so even though your box may be positioned on the nose, the sensor may actually be covering the lips as well, and since there is far more contrast on the lips than on the tip of a person's nose, the camera would naturally focus on the lips.

IMAGE: http://farm9.staticflickr.com/8353/8332634424_a06aba3aae_b.jpg
IMAGE LINK: http://www.flickr.com …s/noobography/8​332634424/  (external link)
Squares (external link) by noobographer (external link), on Flickr

IMAGE: http://farm9.staticflickr.com/8355/8332635932_15a38465bf_b.jpg
IMAGE LINK: http://www.flickr.com …s/noobography/8​332635932/  (external link)
2013 (external link) by noobographer (external link), on Flickr

-Tom
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Miltz
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Dec 31, 2012 23:59 |  #782

vinmunoz wrote in post #15429542 (external link)
do you do focus and recompose? for thin DOF it's not advisable. little shifting will also shift the focal plane.

Not for the tripod shots, no. The Ultra thin DOF is a challenge, that's why I expected EXACT focusing with the center point to control it.




  
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Miltz
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Jan 01, 2013 00:00 |  #783

Tony Parenti wrote in post #15429545 (external link)
Was it tripod mounted when you shot the person aiming at nose tip?

No this was handheld...




  
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PEjercito
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Jan 01, 2013 00:32 |  #784

Loving the pics from this lens. Can't wait to place my order next Monday :D




  
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Eno_Khem
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Jan 01, 2013 00:43 |  #785

Sirrith wrote in post #15429738 (external link)
In that case I would say the subject is moving slightly before you press the shutter button. Another possibility is this: the AF points are larger than you'd think, the actual AF sensor area is greater than the size of the box you see in the viewfinder, so even though your box may be positioned on the nose, the sensor may actually be covering the lips as well, and since there is far more contrast on the lips than on the tip of a person's nose, the camera would naturally focus on the lips.

I agree. The most case of the problem I found is that the AF sensor is bigger than the square box you see in the view finder. AF sensor might focus at the most contrast spot in the area and it may not be the exact position you want it to focus. Any lens can face this problem if the target area is not big enough or not have contrast enough.

You might need to lower the f-stop a bit or use Live View and manual focus for this case.


Khem flickr (external link) • 5D II | Σ35 1.4 | 85 1.8 | 135L | 17-40L | Tamron 28-75 | Tamron 70-300 VC | 430EX II

  
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Sirrith
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Jan 01, 2013 01:29 |  #786

Eno_Khem wrote in post #15429936 (external link)
You might need to lower the f-stop a bit or use Live View and manual focus for this case.

Or, you know, focus on the eyes instead of the nose :D


-Tom
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vipergts831
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Jan 01, 2013 01:40 |  #787

Sirrith wrote in post #15430009 (external link)
Or, you know, focus on the eyes instead of the nose :D

bw!

Good thing with the 5dmkiii I always have a focus point in the area :lol:


-Omar- Flickr (external link) , 5px (external link)
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Beginners worry about gear, professionals worry about skill and masters worry about light

  
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Miltz
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Jan 01, 2013 01:53 |  #788

Since I bought the Canon 35mm f2 IS lens and I wasn't happy with it, I went and bought the Sigma 35mm 1.4 to compare before being stuck with a expensive lens I don't love... One is going back. Focus on the sigma has been a bit tricky, I'm still testing that. But lens move on to sharpness. That was my main issue with the Canon 35mm f2 IS, especially since my 40mm 2.8 was sharper. Anyway, the Sigma 35mm @ 1.4 is SHARPER than the Canon is @ F2. The Sigma @ 2.8 is sharper than the Canon @ f4... Pretty amazing stuff. ALL tests were done using DPP RAW 200 ISO same subject and lighting using live view. These are IMPRESSIVE results. To be honest, I expected a lot more from Canon. I really wanted IS for walk around night time shots, but when a $150 lens (40mm 2.8) was sharper I couldn't accept that. I'm leaning towards keeping the sigma pending the focus point testing again. I just wish it wasn't so big and heavy.




  
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vipergts831
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Jan 01, 2013 01:57 |  #789

Miltz wrote in post #15430051 (external link)
Since I bought the Canon 35mm f2 IS lens and I wasn't happy with it, I went and bought the Sigma 35mm 1.4 to compare before being stuck with a expensive lens I don't love... One is going back. Focus on the sigma has been a bit tricky, I'm still testing that. But lens move on to sharpness. That was my main issue with the Canon 35mm f2 IS, especially since my 40mm 2.8 was sharper. Anyway, the Sigma 35mm @ 1.4 is SHARPER than the Canon is @ F2. The Sigma @ 2.8 is sharper than the Canon @ f4... Pretty amazing stuff. ALL tests were done using DPP RAW 200 ISO same subject and lighting using live view. These are IMPRESSIVE results. To be honest, I expected a lot more from Canon. I really wanted IS for walk around night time shots, but when a $150 lens (40mm 2.8) was sharper I couldn't accept that. I'm leaning towards keeping the sigma pending the focus point testing again. I just wish it wasn't so big and heavy.

Best 35 mm on the market in my opinion. :)


-Omar- Flickr (external link) , 5px (external link)
Phaseone 645DF+...because only the best will make up for my lack of skills.
Beginners worry about gear, professionals worry about skill and masters worry about light

  
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Sirrith
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Jan 01, 2013 02:42 |  #790

vipergts831 wrote in post #15430032 (external link)
bw!

Good thing with the 5dmkiii I always have a focus point in the area :lol:

Yes, the 61-pts are nice in that respect :) no more focus recompose!

Miltz wrote in post #15430051 (external link)
Since I bought the Canon 35mm f2 IS lens and I wasn't happy with it, I went and bought the Sigma 35mm 1.4 to compare before being stuck with a expensive lens I don't love... One is going back. Focus on the sigma has been a bit tricky, I'm still testing that. But lens move on to sharpness. That was my main issue with the Canon 35mm f2 IS, especially since my 40mm 2.8 was sharper. Anyway, the Sigma 35mm @ 1.4 is SHARPER than the Canon is @ F2. The Sigma @ 2.8 is sharper than the Canon @ f4... Pretty amazing stuff. ALL tests were done using DPP RAW 200 ISO same subject and lighting using live view. These are IMPRESSIVE results. To be honest, I expected a lot more from Canon. I really wanted IS for walk around night time shots, but when a $150 lens (40mm 2.8) was sharper I couldn't accept that. I'm leaning towards keeping the sigma pending the focus point testing again. I just wish it wasn't so big and heavy.

The Sigma is definitely an outstanding piece of glass, even when leaving price out of the equation. Hopefully all their future releases will live up to what they've started with the 35. Though yes, it is the heaviest 35/1.4 on the market to my knowledge (apart from the Zeiss maybe).

My advice is to try shooting with a tripod on a non-moving subject, because if you or your subject ares moving, you can never be sure if the problem is with the movement, or with the AF.


-Tom
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F-Stop Guru review | RRS BH-40 review

  
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Miltz
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Jan 01, 2013 03:33 as a reply to  @ Sirrith's post |  #791

Almost forgot to mention the Sigma is silent compared to the Canon... The canon 35mm f/2 IS lens is the loudest lens I've ever heard focusing.




  
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Earwax69
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Jan 01, 2013 04:13 |  #792

Mitz: I also have the 6D and the S35 however I dont notice much front/back focus on my setup. I use focus and recompose by the way. I check my pict with the zoom function just after and reshoot if the focus is not where I want.

Do you notice the same problem when shooting full body shot or is it only for close-up?


Canon 6D | S35mm f1.4 | 135mm f2 The rest: T3i, 20D, 15mm f2.8, 15-85mm, 24mm f2.8, 50mm f1.8, 85mm f1.8, 90mm f2.8 macro, 55-250mm.
So long and thanks for all the fish

  
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zarray
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Jan 01, 2013 04:22 as a reply to  @ Earwax69's post |  #793

^

waiting for reports on focusing issues to show up...my sigma 50mm has given me nightmares and im hoping the S35 does better in this regard.


5D Mark II | 5Dc |17-40 | 24-105 | 70-200 F2.8 IS | Sigma 50mm 1.4 | 580EX

  
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DamianOz
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Jan 01, 2013 08:00 |  #794

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Bodies - Canon EOS 5DIII | EOS 6D
Primes - TS-E24 f/3.5L II | Σ 35mm F1.4 DG Art | EF 85 f/1.2L II | EF 135 f/2L
Zooms - EF 16-35 f/2.8L II | EF 24-70 f/2.8L II | EF 70-200 f/2.8L IS II | Σ 24-105mm F/4 DG OS Art | Σ 120-300mm F/2.8 DG OS Sport

  
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Flintpond
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Jan 01, 2013 13:19 |  #795

Fallin in love with the lens, the more I test it. Haven't done any real work with it yet, but it's a fun and impressive lens. Still trying to figure out if the focus is working correctly with the 7D. The sepia pic of our Dobe was tested using the old 30D Canon just for fun. Works decent with that camera, I have to say :)

IMAGE: http://www.flintpondphoto.com/siggy/Sigtest1.jpg
really happy with the creamy bokeh...
IMAGE: http://www.flintpondphoto.com/siggy/Sigtest2.jpg

IMAGE: http://www.flintpondphoto.com/siggy/Sigtest3.jpg

Kind Regards,
Patty

_______________
7D ~ 5D ~ 30D ~ 24-70 2.8L~ 70-200 F4L ~ 35 F2 ~ 85 1.8 ~ 50 1.4 ~ Sigma 35 1.4 DG HSM ~ 430 EX II

  
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Sigma 35mm f/1.4 DG HSM
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