Can anyone explain to me about the f/ no. for apertures such as f2.0, f4.5.
i really dun understand what it means and how to use it..
thanks
i really dun understand what it means and how to use it..
thanks
Wince, that's true.
Have a look here:http://www.photoxels.com/tutorial_aperture.html
Or you can also start from scratch here: http://www.photoxels.com/digital-photography-tutorials.html
These are quite good places to start from. The public library also has alot of books about basic photography concepts that you can also learn from.
Good luck!
Can anyone explain to me about the f/ no. for apertures such as f2.0, f4.5.
i really dun understand what it means and how to use it..
thanks
Not entirely correct but some information is in there.HI, im no expert - as a matter of fact im a slow learner but im goona go out on a limb here ( my shrink would be so happy with me ) and try to explain what i know or think i know.
the size of the aperture determines how much light, ie the quantity of light, that will reach the media you use to record an exposure. The wider the aperature, the more it is open and the more light that can reach the media. The smaller the aperature, the less it is open and the less light that can reach the media. So what you dare say?? well the fact is that the quantity of light that reaches the media is not only a necessary ingredient for an exposure to happen but the quantity of light also affects depth of field. You know those beautiful pictures you see of flowers or birds that are so sharp and the background seems blurried, well that has to do with depth of field. ok, back to aperture. Anyway we have a scale that denotes the size of the aperture opening, and we call it the f- stop scale. Commit these f-stops to memory. you can thank me later, f/2, f/2.8, f/4. f/5.6, f/8
f/2 is a wider opening than f/4, f/4 is a wider opening than f/5.6, f/5.6 is a wider opening than f/8 yadda yadda ......
the smaller the number the wider the opening!!!! why do you care? need more light use a smaller f-stop. The math that goes into the formula for f/stops is complicated and it may not seem rational BUT IT IS! i gave you a series of f-stops above. As you go from one f-stop to another in sequence, one half the light becomes available. so the amount of light available at f/4 is half the amount available if you used f/2. and yea the amount of light hitting the media at f/5.6 is half the amount that hits it at f/4 and 1/4 the amount that hits it at f/2. This will all become understandable as you now read more on your own.
so in conclusion you need f-stops to know how much light to send to the media.
you also need to know f-stops to control depth of field ( look that up ) and finally...
it is a given ( most of the time ) that a lens is sharper about two stops down from its widest opening! Yo!!! did you hear this? I just showed you how to get a sharper image. if your lens is a f/4 lens, try it at f/8 and see what happens! I left out a lot of stuff and i dont even know if what i said is accurate, but ya know what? It helped me!!!!
troy
Not entirely correct but some information is in there.