need some help in DOF( deth of field )


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Aug 15, 2009
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#1
i am using a canon 50mm f1.8 lens . i love the effect when i am taking close up on object or faces with the background blurr . but when i try to take a full body of a person the background seems to be clear too . any setting i can do to make the background blurr ?
:)

hope some kind hearted pro could give me some help :) thanks alot :)
 

HVB88

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Dec 9, 2005
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#3
Try to shoot open wide (use f/1.8)... if you think the background still not so blurrr, you can either move closer to the object or get 50mm f/1.4.
 

mygixs

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Mar 10, 2009
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#4
to get blurred background does it mean we need to put the f at 1.8? or at the highest
 

Aug 15, 2009
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#6
haha thanks dude ,i am shooting with F1.8 already . and focusing on the person itself . i know the back ground can be blurr when i move closer but i cant moves any closer becasue i want a full body shoot . so other than geeting a lower F lenes no other setting i can do to get the bluff backgound effect i wanted ?
 

Galdor

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#7
haha thanks dude ,i am shooting with F1.8 already . and focusing on the person itself . i know the back ground can be blurr when i move closer but i cant moves any closer becasue i want a full body shoot . so other than geeting a lower F lenes no other setting i can do to get the bluff backgound effect i wanted ?
How far away is the model from the background?

I think best to show a picture.
 

Lomographer

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#8
haha thanks dude ,i am shooting with F1.8 already . and focusing on the person itself . i know the back ground can be blurr when i move closer but i cant moves any closer becasue i want a full body shoot . so other than geeting a lower F lenes no other setting i can do to get the bluff backgound effect i wanted ?
do a search on a few methods on how to achieve lowest DOF.

you can also try using ps to create a faux bokeh effect, or false blur background effect.

however, this won't be as nice as the "real" deal.
 

Aug 15, 2009
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#10
haha i try it with my mum at home . she say her pic too urgly dun allow me to post online . haha yeah the background is kind of near becasue its indoor . does it means if i take the pic in a wide open space with far background the background will have the blurr effect ? yeah i can editthe blurr myself in photoshop but i prefer a natural wants :)
 

Aug 15, 2009
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#11
i saw the artical you posted . it solve my problem .thanks alot Lomographer :) you are the best .
 

Galdor

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#12
haha i try it with my mum at home . she say her pic too urgly dun allow me to post online . haha yeah the background is kind of near becasue its indoor . does it means if i take the pic in a wide open space with far background the background will have the blurr effect ? yeah i can editthe blurr myself in photoshop but i prefer a natural wants :)
Yes, with a background away from your subject the bokeh will be achieved easier.
 

Lomographer

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#13
i saw the artical you posted . it solve my problem .thanks alot Lomographer :) you are the best .
no worries, no i'm not the best:)

but thanks, you can try it out with objects as shown by sulhan.

it's easier and you can post it up here so maybe we can see what the problem is...

any objects will do... even a small toy:)
 

surrephoto

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#15
If you are shooting 1.6x crop (correct me if i'm wrong), chances are that the background blur will not be strong enough to isolate the entire individual at 50 mm f1.8.

This is from personal experience.
 

Lomographer

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#16
If you are shooting 1.6x crop (correct me if i'm wrong), chances are that the background blur will not be strong enough to isolate the entire individual at 50 mm f1.8.

This is from personal experience.
there is a one stop DOF difference on ff as compared to crop (1.5/1.6x) right?
 

surrephoto

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#18
there is a one stop DOF difference on ff as compared to crop (1.5/1.6x) right?
Roughly, the exact mathematics are confusing, because to get the same perspective on FF/Crop, the focal length is different and affects the overall intensity and quality of the bokeh and DOF.

For example;

50 mm @ f1.8 on FF = 31 mm @ f1.1 on 1.6x crop.

50 mm @ f1.8 on 1.6x crop = 80 mm @ f2.9 on FF

This is thus the "Full-frame Advantage".
 

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Lomographer

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#19
Roughly, the exact mathematics are confusing, because to get the same perspective on FF/Crop, the focal length is different and affects the overall intensity and quality of the bokeh and DOF.

For example;

50 mm @ f1.8 on FF = 31 mm @ f1.1 on 1.6x crop.

50 mm @ f1.8 on 1.6x crop = 80 mm @ f2.9 on FF

This is thus the "Full-frame Advantage".
yea, this is very technical, but thanks for phrasing it in a way easier for me to understand:)

:thumbsup::thumbsup::thumbsup:
 

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