1. Aperture and Shutter

I was under the assumption that shutter speed can over expose or under expose a photograph. But different apertures with the right shutter speed can also result in over or under exposing a photograph? Please enlighten thanks!

2. Re: Aperture and Shutter

Yep... you got both the ideas right.

3. Re: Aperture and Shutter

ISO speed can also affect the exposure of the photo.

4. Re: Aperture and Shutter

I myself still yet to master the settings...

5. Re: Aperture and Shutter

Originally Posted by itsybitsyspidy
I was under the assumption that shutter speed can over expose or under expose a photograph. But different apertures with the right shutter speed can also result in over or under exposing a photograph? Please enlighten thanks!
As I understand it, exposure is affected by a combination of iSO, Aperture & shutter speed setting.

6. Re: Aperture and Shutter

so EV step is just blowing up the aperture and shutter speed together?

7. Re: Aperture and Shutter

Still got Exposure Compensation...

8. Re: Aperture and Shutter

The relationship between shutter speed and aperature can be imagine as a calculation on the amount of volume, in photography sense, it is the amount of light.

If your aperature is big (f1.8) and your shutter speed is slow (8"), you get a large volume which in turns a large amount of light which might lead to overexposure. On the other hand, if your aperature is small (f22) and your shutter speed is fast (1/8000), you get a very small volume which means a small amount of light which might lead to underexposure.

For ISO, the higher the ISO, the more reactivity it is to light, but at the expense of noise. So if you combine the 3 factors together, it is very much the fundamental of photography.

9. Re: Aperture and Shutter

Originally Posted by Francis247
The relationship between shutter speed and aperature can be imagine as a calculation on the amount of volume, in photography sense, it is the amount of light.

If your aperature is big (f1.8) and your shutter speed is slow (8"), you get a large volume which in turns a large amount of light which might lead to overexposure. On the other hand, if your aperature is small (f22) and your shutter speed is fast (1/8000), you get a very small volume which means a small amount of light which might lead to underexposure.

For ISO, the higher the ISO, the more reactivity it is to light, but at the expense of noise. So if you combine the 3 factors together, it is very much the fundamental of photography.
wow bro, thanks alot for clearing the stuff. helps alot.

10. Re: Aperture and Shutter

Originally Posted by redstone
Still got Exposure Compensation...
er it's that +0.5 +1 +2 thingy right? how does that work?

11. Re: Aperture and Shutter

Originally Posted by itsybitsyspidy
wow bro, thanks alot for clearing the stuff. helps alot.
Hi,

You are welcome. I believe others got a better way of clarifying than my engineering method of explaining.

Hope that others can share their views on this too.

12. Re: Aperture and Shutter

Aperture besides controlling the amount of light,
it controls the DOF (Depth of Field).

13. Re: Aperture and Shutter

actually i prefer the technical/engineering stuff, helps me understand it better.

14. Re: Aperture and Shutter

Originally Posted by obewan
Aperture besides controlling the amount of light,
it controls the DOF (Depth of Field).
am i right to say because you focus on an object, then if the background is further away, lesser light gets reflected off the background, thus when reaching your lens it makes the background go out of focus and everything?

15. Re: Aperture and Shutter

Originally Posted by obewan
Aperture besides controlling the amount of light,
it controls the DOF (Depth of Field).
The bigger the aperature (f1.8), the shallower the DOF. The smaller the aperature (f22), the greater depth of field.

I did some shots using my 50 f1.8 to show the different DOF at different aperature settings. Thought of using it to explain DOF and aperature relationship.

16. Re: Aperture and Shutter

heh. yeah i only know the F-number smaller can get better bokeh, shutter speed slower can get nice night shots, shutter speed fast together with exposure compensation can be used if your hands are shaky, machiam can act like "VR". just that i dunno the physics behind it. But i see f/22 can also give great bokeh leh. dun understand.

17. Re: Aperture and Shutter

Originally Posted by Francis247
The relationship between shutter speed and aperature can be imagine as a calculation on the amount of volume, in photography sense, it is the amount of light.

If your aperature is big (f1.8) and your shutter speed is slow (8"), you get a large volume which in turns a large amount of light which might lead to overexposure. On the other hand, if your aperature is small (f22) and your shutter speed is fast (1/8000), you get a very small volume which means a small amount of light which might lead to underexposure.

For ISO, the higher the ISO, the more reactivity it is to light, but at the expense of noise. So if you combine the 3 factors together, it is very much the fundamental of photography.
weee! very good explaination. so am i right to say that if i need a high shuttle speed to take a photo, my aperture gotta be wider? please teach me some stuff man. it's real hard to get the settings right for a good shot =(

18. Re: Aperture and Shutter

Originally Posted by itsybitsyspidy
am i right to say because you focus on an object, then if the background is further away, lesser light gets reflected off the background, thus when reaching your lens it makes the background go out of focus and everything?
Hi,

How about this method of explaining: The bigger the aperature (f1.8), the less focus will be the surrounding hence causing the background to blur. On the other hand, the smaller the aperature (f22), the image capture by the lens are more focus hence the background is more clear and sharp.

You can imagine, if you want to see something far away, you tends to focus and strain your eyes (smaller aperature). However, if your relax your eyes (bigger aperature), something far away may not appear as clear.

19. Re: Aperture and Shutter

Originally Posted by Koelsch
weee! very good explaination. so am i right to say that if i need a high shuttle speed to take a photo, my aperture gotta be wider? please teach me some stuff man. it's real hard to get the settings right for a good shot =(
Hi,

The main thing behind ISO, Shutter Speed and Aperature is amount of lighting available. Most (if not all) digital cameras are equipped with the metering system to determine the amount of light available, so it tends to use what is the read out on the metering to determine the ISO, aperature and shutter speed.

However, if you are using manual setting, on a bright sunny day, you have plenty of light, you may want to avoid overexposure. So, you may want to use a lower ISO so that it is less reactivity to the amount of light falling onto the CCD (too technical here, still can't really explain well). On top of that, you may wish to use fast shutter speed to avoid hand shake problem, so your aperature selected should be in the range of big aperature (f1.8) or middle range (f5.6 - f11) depending on the shutter speed and how much light is available.

20. Re: Aperture and Shutter

Originally Posted by Francis247
Hi,

How about this method of explaining: The bigger the aperature (f1.8), the less focus will be the surrounding hence causing the background to blur. On the other hand, the smaller the aperature (f22), the image capture by the lens are more focus hence the background is more clear and sharp.

You can imagine, if you want to see something far away, you tends to focus and strain your eyes (smaller aperature). However, if your relax your eyes (bigger aperature), something far away may not appear as clear.
but i see photographs of 300mm f/22 of maybe, birds, and the birds are sharp and clear, while the background is totally off. how does that work?

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