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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 17 Sep 2012 (Monday) 13:11
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New Sigma 35mm f/1.4 HSM DG

 
kipliq
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Nov 07, 2013 00:25 |  #3496

Hey all, 1.4 is new grounds for me, Do you all have close to 100% keeper rates at 1.4. I wanted to test the new sigma but at my nieces party I came up with like maybe 60-70% keeper rate about. Would I get a higher rate of keepers with the canon 35 1.4. Could it be user error? What would be the best way to capture images at 1.4.


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vinmunoz
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Nov 07, 2013 00:30 |  #3497

use outer focus points. the DOF is so shallow that if you use the center and do focus and recompose might cause the focal plane to shift and miss your target.

1.4 is also not advisable for group shots for the same reason, shallow DOF. you gotta stop down.

never own the canon version so i can't contribute.


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kipliq
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Nov 07, 2013 01:04 |  #3498

vinmunoz wrote in post #16431307 (external link)
use outer focus points. the DOF is so shallow that if you use the center and do focus and recompose might cause the focal plane to shift and miss your target.

1.4 is also not advisable for group shots for the same reason, shallow DOF. you gotta stop down.

never own the canon version so i can't contribute.

Cool. I was using the center focus point I don't do many focus and recompose shots. If it is my technique and not the lens I'll be happy. I took 75 shots are the dinner with my 580ex and I had 30 missed focus. Could be my fault. I'll test on outer focus points.


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vinmunoz
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Nov 07, 2013 01:07 |  #3499

Also learn where to focus on group shots.


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kipliq
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Nov 07, 2013 01:13 |  #3500

vinmunoz wrote in post #16431354 (external link)
Also learn where to focus on group shots.

I was only taking pictures of a single person not a group shot. I snapped once I got confirmation, 25 pictures didn't' hit focus. I'm also thinking am I using 1.4 wrong? For a 3 year old kid moving around, I do like the way 1.4 looks once I hit good focus on her face.


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vinmunoz
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Nov 07, 2013 01:22 |  #3501

oh then i guess the culprit is the focus and recompose. try your outerpoints next time.


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kipliq
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Nov 07, 2013 01:43 |  #3502

vinmunoz wrote in post #16431367 (external link)
oh then i guess the culprit is the focus and recompose. try your outerpoints next time.

I don't focus and recompose much, I move the box to a different point on my 7D. I don't use bbf. I do use outerpoints sometimes depends on the position of the object or person.


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itsmejson
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Nov 07, 2013 08:00 |  #3503

Is it better to not use back button focus when using 1.4?


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vinmunoz
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Nov 07, 2013 08:17 |  #3504

Been using BBF for like 2 years now. I have no problem. I don't know with others.


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pwm2
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Nov 07, 2013 08:24 |  #3505

itsmejson wrote in post #16431775 (external link)
Is it better to not use back button focus when using 1.4?

You can use back-button focus - just remember that if you sway one inch that means a lot if your DoF is narrow. But same thing with focusing on half-press of the shutter button - if you delay long, you or the subject might have swayed a bit.


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vertigo235
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Nov 07, 2013 08:38 |  #3506

The DOF is REALLY REALLY small even up to f 2.0 for moving things like kids, they can move out of the DOF before your camera captures the shot. You will get less keepers for sure. to test the lens I'd recommend testing on some stationary objects, it's also possible your lens needs calibration. Mine certainly did, you can get the Sigma dock for that.


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paladinca
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Nov 07, 2013 09:14 as a reply to  @ vertigo235's post |  #3507

My miss rate is also high (around 40% when I shoot outdoor at the distance of 3-5 meters). It's sometimes spot on and sometimes front focus by 1 meter. And it focuses better indoors, the miss rate is less than 20%. My dock just arrived. My camera is 5Dc, which doesn't have live view. Any idea how I can calibrate my S35 on a 5Dc?

Edit: I'm not sure my copy really needs calibration since it performs quite well when shooting a focus chart at a closer distance ( less than 1 meter) indoor.


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kipliq
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Nov 07, 2013 10:59 |  #3508

vertigo235 wrote in post #16431863 (external link)
The DOF is REALLY REALLY small even up to f 2.0 for moving things like kids, they can move out of the DOF before your camera captures the shot. You will get less keepers for sure. to test the lens I'd recommend testing on some stationary objects, it's also possible your lens needs calibration. Mine certainly did, you can get the Sigma dock for that.

Subject was eating cake and opening presents. I have the dock and see if that helps. I'm worried about people saying it works in different types of lights.


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kipliq
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Nov 07, 2013 11:30 |  #3509

xpfloyd wrote in post #16153489 (external link)
OK I seem to have made a breakthrough. Lens seems to finally be functioning correctly at all focus distances wide open.

I downloaded and installed magic lantern onto my CF card and installed it on my camera. I then downloaded and installed the latest magic lantern nightly build (as dottune is not in the normal version of magic lantern yet). I then ran dottune via magic lantern for the 4 distances required for the dock. The process is fully automated and seems very accurate.

I ended up with +1, +6, +8, -2

I put these numbers into the dock software, updated the lens and set my body MA back to 0. I then set up the camera at a random distance from the target and ran the automated dottune again as a check and it came out as 0. RESULT!

I have been taking test shots for about an hour of real subjects hand held and it seems to be spot on. I'm now a happy camper!

If sigma release an ART version of the 85 1.4 that can be dock calibrated I will now be buying it. I had the existing version but sold it due to AF issues

How do you run the Dotune in ML? I have a 7D. Should I do the test in the afternoon sun? I would love to have a copy like yours. I love the feel of the lens just the Sigma lens cap sucks lol.


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kipliq
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Nov 07, 2013 23:01 as a reply to  @ kipliq's post |  #3510

How does Amazon return work? What method do you return the items with? Once I get the new lens do I have another 30 days to test the lens? I did plant life and objects around the yard and 70 out or 270 had bad focus after I used DotTune with a -3MA. What is your keeper ratio of this lens? I'm wanting to try another copy or thinking of going with the Canon L refurbished. I love the feel of the lens.


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New Sigma 35mm f/1.4 HSM DG
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