lens flare, white balance, exposure

[Yoshi]

Hi, I have some questions on some camera stuff, can somebody please detailed answers to the my questions. I say detailed because I really don't get the following things. Thanks a million.

-When a light is much brighter than it looks in reality, is this called lens flare? I know that lens flare are the circles accross the image and the rays of light coming out of a light, but I don't know if we also consider a light that is much brighter than in reality lens flare too. For example, you film the sun and it looks much brighter than it should be.

-How do you do to not have this light so bright?

-When you are in mixed lighting conditions, and you want to get the real colours everywhere, how do you manually white balance then? Here I'm talking of the circumstances where you can't put CTB or CTO to adjust the colours.

-When you have green, red, blue, purple lights in the same shot, should you white balance to tungsten or to daylight to have the correct colours everywhere?

-What does perspective really mean in movies and drawings?

-When you have different lighting conditions in the same shot, for example low lights areas and bright light areas, how do you do to get everywhere correctly exposed?

-And finally, what's the problem with auto white balance in mixed lighting situations?

Thank you very much for your help.

Yoshi

[Dotty.c]

if I had read this lastnight I would have blamed the fact that I dont understand the question on the wine, :) but as I'm sober today we'll just wait for our resident nuclear physicist ok :)

[BarryM]

Lens flare is created when non-image forming light enters the lens and subsequently hits the camera's film or digital sensor. This often appears as a characteristic polygonal shape, with sides which depend on the shape of the lens diaphragm. It can lower the overall contrast of a photograph significantly and is often an undesired artifact, however some types of flare may actually enhance the artistic meaning of a photo. Understanding lens flare can help you use it--or avoid it--in a way which best suits how you wish to portray the final image.

If the bright light is only part of your scene and way out, then u could use filters to bring the light down slightly, if you expose for the light ur other areas are going to be darker.................

......................sod it See Chris, hes the guy for this stuff. :Dm

[Chris Hawkins]

Yoshi, welcome to the forum - why don't you go and introduce yourself properly in the who are you forum. Some of your questions don't really make sense; others are quite advanced, whilst others are about the fundamentals of photography and another has nothing to do with photography. Don't run before you can walk - there are some good tutorials on photography basics on the Forum.

Cheers

Chris

[eddiemiller9000]

For information on perspective I recommend watching Father Ted the holdiday episode in the caravan.
Father Ted: Now concentrate this time, Dougal. These
[he points to some plastic cows on the table]
Father Ted: are very small; those
[pointing at some cows out of the window]
Father Ted: are far away...

[OnceDown]

-When a light is much brighter than it looks in reality, is this called lens flare? I know that lens flare are the circles accross the image and the rays of light coming out of a light, but I don't know if we also consider a light that is much brighter than in reality lens flare too. For example, you film the sun and it looks much brighter than it should be.

No, that's called overexposure and I doubt very much whether the sun is brighter when you film it than if you look at it with the naked eye... Lens flare is not the same as light rays - lens flare is an effect of the glass in the lens reflecting incoming light and causing usually a line of bright spots across the image.


-How do you do to not have this light so bright?

Increase your shutter speed or close down your aperture (or both), or use ND graduated filters, etc...


-When you are in mixed lighting conditions, and you want to get the real colours everywhere, how do you manually white balance then? Here I'm talking of the circumstances where you can't put CTB or CTO to adjust the colours.
What do you mean mixed lighting conditions? Different coloured lighting? Different levels of light? Both?


-When you have green, red, blue, purple lights in the same shot, should you white balance to tungsten or to daylight to have the correct colours everywhere?
I don't know - trial and error maybe, and probably lots of work in photoshop!


-What does perspective really mean in movies and drawings?
Read the previous post. However, if you are using telephoto (long) lenses, it often has the effect of "squashing" the perception of distance and making it appear that the objects are closer together than they really are - that's due to perspective! Conversely, if you take a pic with a fisheye lens, the opposite will apply!


-When you have different lighting conditions in the same shot, for example low lights areas and bright light areas, how do you do to get everywhere correctly exposed?

This can be difficult, but you can use a light meter and try to make sure the shadows and the highlights are within your camera's dynamic range (simply put, the range of levels in which detail can be seen) - this is usually about +/- 2 stops. Either that or you could try your hand at HDR photography but not everyone (myself included) like it very much.


-And finally, what's the problem with auto white balance in mixed lighting situations?
Again, what type of mixed lighting conditions? The one thing I can say is that you need to remember that a digital camera is essentially a computer, it thinks in 1s and 0s - as advanced as they might be, when something thinks in 1s and 0s, it's not too difficult to confuse it.

Hope this has helped a little - I think I've confused myself answering them!!

[Yoshi]

Thanks OnceDown, your answers really helped me out.

-What I meant by mixed lighting conditions was: for example, you position the camera outside and shoot a house light by tungsten lighting. The exterior is light by daylight whereas inside it's tungsten. How do you do to manually white balance so that you get the real colours everywhere? What I mean is where should you place the white paper?

yoshi

[george.monaghan]

What I mean is where should you place the white paper?

yoshi


Hi
Don't tempt me!:coffee::bum1:

You cannot balance both in camera. Best left for daylight.