principle of the third rule


niventham

New Member
Oct 29, 2010
77
0
0
28
#1
the third rule is one of the most basic rule photographers knows....i am a newbie....does it mean that i cannot choose my one of my focus point in the camera in the middle...but must choose the top/bottom or left/right...focus point
 

spree86

Senior Member
Feb 3, 2009
4,774
0
0
Bishan
www.flickr.com
#2
the third rule is one of the most basic rule photographers knows....i am a newbie....does it mean that i cannot choose my one of my focus point in the camera in the middle...but must choose the top/bottom or left/right...focus point
Why not? You can always use the center focus point to focus, lock the exposure and recompose after that.
 

Rashkae

Senior Member
Nov 28, 2005
19,105
12
0
#4
You mean "the rule of thirds", right? It's not "the third rule".
 

niventham

New Member
Oct 29, 2010
77
0
0
28
#5
eh ya rule of thirds...but if i use center focus then wont my picture be at the centre ?
 

catchlights

Moderator
Staff member
Sep 27, 2004
21,903
46
48
Punggol, Singapore
www.foto-u.com
#6
the rule of third is recommend you to place the interest of your subject at the intersection points, not asking you to set your focusing point at intersection points.

btw focus and recompose will not always work, that is why modern cameras has so many focusing points.
 

niventham

New Member
Oct 29, 2010
77
0
0
28
#7
if i put my point of interest at the intersecting point....and if i dont place my focus point at that point of interest wont it go out of focus
 

Rashkae

Senior Member
Nov 28, 2005
19,105
12
0
#8
if i put my point of interest at the intersecting point....and if i dont place my focus point at that point of interest wont it go out of focus
Depends on the aperture you use. In landscape photography where you normally use a very small aperture like f/11 or 1/16 it doesn't matter, your DOF will be very deep anyway.

It's more of a challenge when shooting portraits.
 

niventham

New Member
Oct 29, 2010
77
0
0
28
#9
i am using a 18-70 mm lens...at f4.5 but why isnt my pic do not have a shallow of field...???
 

Rashkae

Senior Member
Nov 28, 2005
19,105
12
0
#10
i am using a 18-70 mm lens...at f4.5 but why isnt my pic do not have a shallow of field...???
What focal length? 18mm? Depth of field is impacted by distance to subject, aperture and focal length. Wide-angle lenses (or lenses set at wide angle, like 18mm) have a naturally deep depth of field.

Look here:
http://www.dofmaster.com/dofjs.html

Let's say you're on a Canon budget model (1.6x crop sensor), at 18mm, at f/4.5, and your subject is 3 meters away from you. Your actual depth of field is almost 13 meters!

But let's say you shoot at 55mm, at f/5.6, for a "headshot" of the model (still 3m away). Your depth of field will then be 2 feet, about .65 meters.

I suggest reading up a bit more on the newbies guides to photography. :)
 

niventham

New Member
Oct 29, 2010
77
0
0
28
#11
if you are free you can take a look at my pics....i find them the most horrible photos ever i have seen....it is either out of focus ..or i dont know what to say....
 

coolthought

Senior Member
Jun 23, 2008
2,310
1
0
#12
i am using a 18-70 mm lens...at f4.5 but why isnt my pic do not have a shallow of field...???
and something to add to Rashkae.
DOF is not just the f number.
It is also;
1. focal length of lens
2. distance from camera to subject
3. distance from subject to foreground. (this depends)

even with a pns, you can get a shallow DOP if you know how.
 

spree86

Senior Member
Feb 3, 2009
4,774
0
0
Bishan
www.flickr.com
#13
if you are free you can take a look at my pics....i find them the most horrible photos ever i have seen....it is either out of focus ..or i dont know what to say....
Did you put your focusing as continuous? You cannot recompose shots if you set it at that option, you can change this in your menu.
 

coolthought

Senior Member
Jun 23, 2008
2,310
1
0
#14
if you are free you can take a look at my pics....i find them the most horrible photos ever i have seen....it is either out of focus ..or i dont know what to say....
One thing I can't stand is blur photos. I delete all my blur photos immediately.
Blur photos are simply becos of one or more of these reasons. (referring to static object)
1. Lens didn't focus
2. Camera shake
3. dirty optics
 

niventham

New Member
Oct 29, 2010
77
0
0
28
#15
i dont do continues shots...i not a very good photographer yet
 

niventham

New Member
Oct 29, 2010
77
0
0
28
#17
then what type of focus do you reccommend....but i dont think is continous focus...
 

Rashkae

Senior Member
Nov 28, 2005
19,105
12
0
#18
then what type of focus do you reccommend....but i dont think is continous focus...
This is your choice. If you are the kind who cannot stand still, continuous focus may be better for you.
 

coolthought

Senior Member
Jun 23, 2008
2,310
1
0
#19

spree86

Senior Member
Feb 3, 2009
4,774
0
0
Bishan
www.flickr.com
#20
then what type of focus do you reccommend....but i dont think is continous focus...
Depends on what you are shooting actually, shooing moving objects would be easier on continuous focus, if you want to recompose then use single focus.
 

Top Bottom