Oof?? Dof??

chang.jin · 25th July 2006

hi guys.. been some time that I have signed in to say hello to you guys.

have one question for you all.. I was shooting with my new 50mm f/1.4 and tested it on my model. I shot at f/1.8 and f/1.4, as I want to shoot her full length, I backed off slightly. unexpectedly, the prints came out blurry.. I would like to know:

What is this phenomenon called?
What caused this?
How to prevent such thing from happening again?

thanks in advance!

signing off!

SpitFir3 · 25th July 2006

this is because of the shallow depth of field therefore u focus on that point of the model, then you step back. its gone already...out of focus. so u should step back..and refocus again

ExplorerZ · 25th July 2006

i assume you focused and then step a step back to shoot without refocusing again. if that the case it would be both.
if you did refocused, but still blur that might be due to focusing on the wrong point

chang.jin · 25th July 2006

thanks for the answers.. I re focused already, guys.. made sure that the focusing is correct before I shot.. could DOF blur be caused by me standing too far away, even with focusing??

will the image be affected if I focused at something quite far.. like, a group of people in low light, will they all be blurred by DOF??

ExplorerZ · 25th July 2006

Originally Posted by chang.jin

thanks for the answers.. I re focused already, guys.. made sure that the focusing is correct before I shot.. could DOF blur be caused by me standing too far away, even with focusing?? will the image be affected if I focused at something quite far.. like, a group of people in low light, will they all be blurred by DOF??

actually the furthur u stand from ur subject the deeper the dof you will get, thus chance of having lesser dof blur is lesser. for group, it is recommanded you stop down ur aperture to f8 or even mroe depending on situation.
if you have already refocused i guess it might be due to ur camera focused somewhere again before you completely depress the shutter button (that will be the case if you recomposed/shake after focus locking on subject) i tried 50mm f1.8 to shoot full-body before, getting focus ain't hard since dof is pretty much at that distance, but would be a different story if it was a close up.

ortega · 26th July 2006

to be sure, it is best to post the picture in question.

sumball · 26th July 2006

Agree with Alex. No point for us guessing your problem.

Post the problem picture and ppl will know the true problem.

it might also due to your handshake.

Clockunder · 26th July 2006

Could possibly be too slow shutter speed due to low light condition.

Won't be able to answer threadstarter unless he posts a sample picture with EXIF intact.

Clockunder · 26th July 2006

Originally Posted by jbma

Just step back and refocus lah. You should always do the composition first and must check the focus just before pressing the shutter button.

Threadstarter already did that. See post #4 in this thread.

JediForce4ever · 26th July 2006

also make sure that your focussing point is on the subject when refocussing and not on something else.

25th July 2006	#1
chang.jin New Member Join Date: Jul 2006 Posts: 16	Oof?? Dof?? hi guys.. been some time that I have signed in to say hello to you guys. have one question for you all.. I was shooting with my new 50mm f/1.4 and tested it on my model. I shot at f/1.8 and f/1.4, as I want to shoot her full length, I backed off slightly. unexpectedly, the prints came out blurry.. I would like to know: What is this phenomenon called? What caused this? How to prevent such thing from happening again? thanks in advance! signing off!

25th July 2006	#2
SpitFir3 Member Join Date: May 2003 Location: Habourfront Posts: 768	Re: Oof?? Dof?? this is because of the shallow depth of field therefore u focus on that point of the model, then you step back. its gone already...out of focus. so u should step back..and refocus again __________________ TwoHeartsOneStory

25th July 2006	#3
ExplorerZ Senior Member Join Date: Jan 2006 Location: West Legion Posts: 6,785	Re: Oof?? Dof?? i assume you focused and then step a step back to shoot without refocusing again. if that the case it would be both. if you did refocused, but still blur that might be due to focusing on the wrong point __________________ multiply \|\| deviant \|\| APAD 08

26th July 2006	#6
ortega Moderator Join Date: Nov 2004 Location: NorthEast Posts: 16,507	Re: Oof?? Dof?? to be sure, it is best to post the picture in question. __________________ The Law

26th July 2006	#7
sumball Senior Member Join Date: Jul 2003 Posts: 4,224	Re: Oof?? Dof?? Agree with Alex. No point for us guessing your problem. Post the problem picture and ppl will know the true problem. it might also due to your handshake.

25th July 2006	#4
chang.jin New Member Join Date: Jul 2006 Posts: 16	Re: Oof?? Dof?? thanks for the answers.. I re focused already, guys.. made sure that the focusing is correct before I shot.. could DOF blur be caused by me standing too far away, even with focusing?? will the image be affected if I focused at something quite far.. like, a group of people in low light, will they all be blurred by DOF?? Last edited by chang.jin; 25th July 2006 at 07:54 PM.

26th July 2006	#8
Clockunder Member Join Date: Apr 2005 Posts: 1,767	Re: Oof?? Dof?? Could possibly be too slow shutter speed due to low light condition. Won't be able to answer threadstarter unless he posts a sample picture with EXIF intact.

26th July 2006	#10
JediForce4ever Senior Member Join Date: Aug 2005 Location: Singapore, CanonGraphers.org Posts: 3,163	Re: Oof?? Dof?? also make sure that your focussing point is on the subject when refocussing and not on something else.