I dont recall any article mention anything on this when i read through those article on bokeh. Thus coming here to seek advise from senior and expert. Do bear with me as a noob if my questions sounds ignorance.

- Thread starter Dark Matter
- Start date

- Status
- Not open for further replies.

I dont recall any article mention anything on this when i read through those article on bokeh. Thus coming here to seek advise from senior and expert. Do bear with me as a noob if my questions sounds ignorance.

at infinity Distance there is no out of focus, so no bokeh.

50m is probably way way way past infinity focus on the 50mm f1.8. aperture doesnt matter at this focussing distance.

same concept applies to all lenses.

longer focal length, infinity focus distance is further

i.e. 10mm lens, infinity is probably achieved under 3 metres

50mm maybe 10metres?

85mm probably 25metres? i cant remmeber exact figures.

but with longer focal lengths you have narrower composition area, so to shoot a person in full body you have to be reallly reallly far away..

50m is probably way way way past infinity focus on the 50mm f1.8. aperture doesnt matter at this focussing distance.

same concept applies to all lenses.

longer focal length, infinity focus distance is further

i.e. 10mm lens, infinity is probably achieved under 3 metres

50mm maybe 10metres?

85mm probably 25metres? i cant remmeber exact figures.

but with longer focal lengths you have narrower composition area, so to shoot a person in full body you have to be reallly reallly far away..

Last edited:

you see using your camera LCD or computer screen? camera LCD won't show that much details... try using computer screen and see...

else... increase the distance between subject and background...

hope this helps...

else... increase the distance between subject and background...

hope this helps...

distance is constraint... thats the further the subject can be infront of the back ground.

Would focal length has an impact too? The longer it is, the shorter DOF?

50m is probably way way way past infinity focus on the 50mm f1.8. aperture doesnt matter at this focussing distance.

same concept applies to all lenses.

longer focal length, infinity focus distance is further

i.e. 10mm lens, infinity is probably achieved under 3 metres

50mm maybe 10metres?

85mm probably 25metres? i cant remmeber exact figures.

but with longer focal lengths you have narrower composition area, so to shoot a person in full body you have to be reallly reallly far away..

Maybe you would like to post a picture to show us.

cut your camera to subject distance to half or one quarter if you can, and double your subject to background distance.

or use a lens which double your focal length for what you use now.

or use a lens which double your focal length for what you use now.

if too hard for you to understand, you can also try doing post production like this

I dont recall any article mention anything on this when i read through those article on bokeh. Thus coming here to seek advise from senior and expert. Do bear with me as a noob if my questions sounds ignorance.

the golden rule:

1.Equation 1: DOF~1/aperture. DOF is inversely proportional to aperture opening. Increasing aperture opening=decreasing DOF and vice versa.

now what about the distance and focal length? how do they affect DOF?

ASSUMING aperture opening is CONSTANT, here are the rules:

2. Equation 2: DOF ~ distance. DOF is directly proportional to subject to camera distance. That is DOF will increase if you increase your distance to the subject, likewise it will decrease if you get closer to your subject.

3. Equation 3: DOF ~ 1/focal. DOF is inversely proportional to focal length. That is DOF will decrease if you increase your focal length and vice versa.

Now from 1, 2 and 3, we can also deduce that if we keep our subject in our sensor in the same size and assuming we use the same aperture, the DOF will not change (a zoomed in far away subject will have the same DOF with a closer subject with a small focal length) but take note that if you do this, you will have a different perspective (now that is a different topic)

Now back to you, with what you are doing, you can't achieve a nice bokeh because you are just too far (10 meters) and a 50mm is not that long of a focal length...

Last edited:

bokeh is affected by the depth of field..DOF "is the zone of focus" anything outside of that will be blurred, the character of this blurredness is what to we refer to as bokeh so that means shallower DOF=more bokehlicious..so if you want to have bokehlicious pictures you have to understand how DOF works..here are the rules:

the golden rule:

1.Equation 1: DOF~1/aperture. DOF is inversely proportional to aperture opening. Increasing aperture opening=decreasing DOF and vice versa.

now what about the distance and focal length? how do they affect DOF?

ASSUMING aperture opening is CONSTANT, here are the rules:

2. Equation 2: DOF ~ distance. DOF is directly proportional to subject to camera distance. That is DOF will increase if you increase your distance to the subject, likewise it will decrease if you get closer to your subject.

3. Equation 3: DOF ~ 1/focal. DOF is inversely proportional to focal length. That is DOF will decrease if you increase your focal length and vice versa.

Now from 1, 2 and 3, we can also deduce that if we keep our subject in our sensor in the same size and assuming we use the same aperture, the DOF will not change (a zoomed in far away subject will have the same DOF with a closer subject with a small focal length) but take note that if you do this, you will have a different perspective (now that is a different topic)

Now back to you, with what you are doing, you can't achieve a nice bokeh because you are just too far (10 meters) and a 50mm is not that long of a focal length...

the golden rule:

1.Equation 1: DOF~1/aperture. DOF is inversely proportional to aperture opening. Increasing aperture opening=decreasing DOF and vice versa.

now what about the distance and focal length? how do they affect DOF?

ASSUMING aperture opening is CONSTANT, here are the rules:

2. Equation 2: DOF ~ distance. DOF is directly proportional to subject to camera distance. That is DOF will increase if you increase your distance to the subject, likewise it will decrease if you get closer to your subject.

3. Equation 3: DOF ~ 1/focal. DOF is inversely proportional to focal length. That is DOF will decrease if you increase your focal length and vice versa.

Now from 1, 2 and 3, we can also deduce that if we keep our subject in our sensor in the same size and assuming we use the same aperture, the DOF will not change (a zoomed in far away subject will have the same DOF with a closer subject with a small focal length) but take note that if you do this, you will have a different perspective (now that is a different topic)

Now back to you, with what you are doing, you can't achieve a nice bokeh because you are just too far (10 meters) and a 50mm is not that long of a focal length...

Does this implies that 50mm will only give nice bokeh within a distance of 0.45-3m the range state on the lens 0.45-3 after that is infinity.

Whether or not it gives nice bokeh is a subjective matter, as Rashkae has already explained about the term "bokeh".

Even if your subject is 3m away and your background is 500m away, don't go expecting the kind of uniform blur that you usually see when photographers capture Premier League football shots. Those people are using lenses like 400mm f/2.8 or maybe even longer focal lengths.

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

Although you may not be able to notice the background blurness on Camera screen, but on PC, it should be noticeable at your 50mm f/2.0 setting.

- Status
- Not open for further replies.