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Thread started 21 Feb 2006 (Tuesday) 00:41
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Canon EF 85mm f/1.8 USM

 
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gonzogolf
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Mar 28, 2013 09:59 |  #10036

futureal33 wrote in post #15765041 (external link)
Id agree with you that the technique could potentially cause back focus (ie, focus point at that FL is around the size of her entire head, so it could lock onto something contrasty behind her head) but what I am getting is front focus (consistently at this focal length, but NOT at closer focal length - which doesn't make sense)

Yes, it does. At closer focal lengths the things you are focusing on are more magnified. Hence you more accurately focus on them as your likelihood of getting your focus point on the thing you want.




  
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futureal33
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Mar 28, 2013 10:01 |  #10037

What technique would you use to do a full length portrait at f1.4 (or similar), where you want the eyes sharp? Perhaps I am doing something wrong, as it has happened with two lenses - so the common theme is me, not the lens! Would appreciate any tips/suggestions

Thanks :)


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gonzogolf
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Mar 28, 2013 10:02 |  #10038

futureal33 wrote in post #15765053 (external link)
What technique would you use to do a full length portrait at f1.4 (or similar), where you want the eyes sharp? Perhaps I am doing something wrong, as it has happened with two lenses - so the common theme is me, not the lens! Would appreciate any tips/suggestions

Thanks :)

Are you focus recomposing?




  
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futureal33
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Mar 28, 2013 10:04 |  #10039

gonzogolf wrote in post #15765057 (external link)
Are you focus recomposing?

No, not unless I absolutely cannot help it. I use a 5DmkIII and find that in portrait orientation, the highest row of focus points are right on the subjects eye when doing a full length body portrait - worst case scenario is focus with top row of points, then recompose a few mm. I rarely use the middle focus point and then recompose that much.


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gonzogolf
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Mar 28, 2013 10:11 |  #10040

futureal33 wrote in post #15765066 (external link)
No, not unless I absolutely cannot help it. I use a 5DmkIII and find that in portrait orientation, the highest row of focus points are right on the subjects eye when doing a full length body portrait - worst case scenario is focus with top row of points, then recompose a few mm. I rarely use the middle focus point and then recompose that much.

Next time you are out, try focusing on something that will serve as substitute for the eye. At full body crop size the eye is much smaller than the focus point (the point is larger than the red square in some cases) which means you might be focusing on the nose or forehead instead of the eye. At 1.8 you have precious little margin for error. Maybe move down a bit and hit the cheek, sometimes the neck will be on the same plane as the eye depending on the pose.




  
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Mar 28, 2013 10:21 |  #10041

^^^good tip. thanks...


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Mar 28, 2013 10:35 |  #10042

Thats a great tip - thank you.
Must admit, at full length body portrait crop, the DOF at 1.8 should be sufficient to get a sharp whole head in I would have thought - need to check DOFmaster to confirm


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gonzogolf
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Mar 28, 2013 10:38 |  #10043

futureal33 wrote in post #15765142 (external link)
Thats a great tip - thank you.
Must admit, at full length body portrait crop, the DOF at 1.8 should be sufficient to get a sharp whole head in I would have thought - need to check DOFmaster to confirm

DOfmaster will give you the range of acceptable sharpness, but if you are looking for tack sharp eyes you still have to nail the focus. Have you micro adjusted the lens in question?




  
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futureal33
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Mar 28, 2013 10:41 |  #10044

gonzogolf wrote in post #15765148 (external link)
DOfmaster will give you the range of acceptable sharpness, but if you are looking for tack sharp eyes you still have to nail the focus. Have you micro adjusted the lens in question?

There lies the issue... at close range focus is fine - it needs no micro adjust... however at longer range I am experiencing problems.


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Mar 28, 2013 20:10 |  #10045

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Mar 29, 2013 11:30 |  #10046

3-shot pano.

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Mar 29, 2013 13:09 as a reply to  @ AnnieMacD's post |  #10047

Loving this lens! :D:D


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Mar 30, 2013 13:11 |  #10048

===============
Moderator's Note: This thread is CLOSED after 10000 posts. Chapter II is here:

Canon EF 85mm f/1.8 USM (II)
===============

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