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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

 
jimewall
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Jul 29, 2013 16:07 as a reply to  @ post 16164290 |  #3301

Nice picture.


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Giorgos
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Aug 01, 2013 14:55 |  #3302

hey guys tommorow i gonna do the dot tune method at the 4 distances.
i gonna put the chart 0.3m 0.4m 0.6m away for the 3 points but what distance for the chart should i use for infinity??

thanks


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xpfloyd
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Aug 01, 2013 17:06 |  #3303

Giorgos wrote in post #16173258 (external link)
hey guys tommorow i gonna do the dot tune method at the 4 distances.
i gonna put the chart 0.3m 0.4m 0.6m away for the 3 points but what distance for the chart should i use for infinity??

thanks

When I done it I focused on a building away in the distance (probably 1 mile or so). Just make sure you choose a target that has good contrast


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Giorgos
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Aug 01, 2013 17:16 |  #3304

i can understand the items near camera to be out of focus and with dot tune method to adjust and see the margins. but an item far away from camera wont be almost always in focus? i mean like +20 till -20 MA (due to big dof)?


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xpfloyd
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Aug 01, 2013 17:26 |  #3305

Giorgos wrote in post #16173626 (external link)
i can understand the items near camera to be out of focus and with dot tune method to adjust and see the margins. but an item far away from camera wont be almost always in focus? i mean like +20 till -20 MA (due to big dof)?

The problem for me was that if I focussed on something far away at f/1.4 it was OOF. The further away the less OOF though due to the increased DOF. The dock sorted this. From memory I was +4 +6 +8 -2 or something like that

Giorgos wrote in post #16173626 (external link)
i mean like +20 till -20 MA (due to big dof)?

I dont quite get what you mean here


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Giorgos
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Aug 01, 2013 19:07 |  #3306

xpfloyd wrote in post #16173645 (external link)
The problem for me was that if I focussed on something far away at f/1.4 it was OOF. The further away the less OOF though due to the increased DOF. The dock sorted this. From memory I was +4 +6 +8 -2 or something like that

I dont quite get what you mean here

i thought that being the subject away, even with f1.4 the dof is big enough, and i am asking if its big enough so that even with +-20MFA we will have green dot.

but i guess thats not the case, as you already said you had problems with OOF subject.

regarding the 1/3 front and 2/3 back DOF rule (ie f1.4 and subject at 10meters)
anyone of you using this when calculating the MFA point?? or you all using the half of the region you find?? because someone mentioned it in FM, but the maker of dot tune method said he should use the mid point and not this rule.

at small distances 0.3m 0.4m 0.6m for f1.4 the amount of DOF is 50/50 front/back


but for setting the infinity i guess he has a point there... regarding the 1/3 2/3 rule. but i will check it myself tommorow and see


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xpfloyd
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Aug 01, 2013 19:20 |  #3307

Giorgos wrote in post #16173879 (external link)
regarding the 1/3 front and 2/3 back DOF rule (ie f1.4 and subject at 10meters)
anyone of you using this when calculating the MFA point?? or you all using the half of the region you find?? because someone mentioned it in FM, but the maker of dot tune method said he should use the mid point and not this rule.

at small distances 0.3m 0.4m 0.6m for f1.4 the amount of DOF is 50/50 front/back


but for setting the infinity i guess he has a point there... regarding the 1/3 2/3 rule. but i will check it myself tommorow and see

I have read many threads with people getting worked up with the 1/3 2/3 DOF issue with dottune however this is complete nonsense IMO. For example 35mm at f/1.4 focused at 28m gives a DOF of 875.64m (13.78m in front and 861.86m behind). No where near 1/3 and 2/3. The 1/3 2/3 scenario will happen of course at a certain focus distance but wont either side of it. Its also dependent on apeture. Smaller apetures change the DOF and also the ratio of in front and behind split.

You should just set the MA at the midpoint of your dottune range. The range is where the camera is able to get a focus lock so you want to set it in the middle. Its got nothing to do with DOF.

Someone may come along and blow my argument out the water but thats how I perceive it to work.

EDIT - Magic lantern dottune also uses the mid value method and it has worked well for me for all my lenses.


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eye2i
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Aug 01, 2013 22:17 |  #3308

This lens is just amazing. 0 adjustments on all apertures and distances. I love it.




  
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itsmejson
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Aug 01, 2013 23:18 |  #3309

eye2i wrote in post #16174280 (external link)
This lens is just amazing. 0 adjustments on all apertures and distances. I love it.

Is this when wide open?


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eye2i
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Aug 01, 2013 23:44 |  #3310

itsmejson wrote in post #16174397 (external link)
Is this when wide open?

Yep. I said all apertures but really, I don't use my lens past F/5.6. But from F/1.4-F/5.6, near or close my Sigma is ridiculously on the spot.

But keep in mind copy cairation still exists. I had tried 2 copies before getting this one. The first one was way off (+10) and the focus would shift near MFD. That dock will come in handy, but overall I'm astonished by the sharpness and contrast of the lens.




  
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Aug 02, 2013 08:14 as a reply to  @ eye2i's post |  #3311

Well that is my first copy of the Sigma 35mm returned to Amazon UK for a replacement, hope the second copy isn't worse. That is where the USB dock purchase may come in....if I can still be bothered in my endeavour for the perfect copy.

Anyone care to determine what the USB Dock can fix and when enough is enough and to move on ??


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Giorgos
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Aug 02, 2013 10:37 |  #3312

i returned 2 copies to amazon but kept the 3rd one while i ordered sigma dock.
today i went out and got the values for MFA with dot tune method for 0.3m 0.4m 0.6m and infinity

now i gonna put them in my lens using sigma dock station.
best solution is the dock imo


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xpfloyd
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Aug 02, 2013 12:34 |  #3313

Giorgos wrote in post #16175355 (external link)
best solution is the dock imo

I agree, my lens is flawless now


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Aug 02, 2013 13:11 |  #3314

xpfloyd wrote in post #16175653 (external link)
I agree, my lens is flawless now

Mine was perfect and tack sharp right out of box.


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madhatter04
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Aug 02, 2013 13:13 |  #3315

As was mine. Always love to use this little beauty! It's great for video and for stills, and I feel like I can photograph in the near dark with it.


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New Sigma 35mm f/1.4 HSM DG
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