Nikon D90 new Photography

[haithamhammoud]

Hi,
maybe my inquiries are weird.
i am new photography learning to use my Nikon d90.
1 - i like to know why we use the ISO and why we change it (as understood from the guide, it is used for pictures lighting)
2 - as for the aperture, we lower it to open the lens, in this case the focus will be no longer on the subject taken, if we increase it the lens open decrease and the focus will be on the subject taken the picture for.
3 - is their a link between the shutter speed and the aperture. ex. when we lower the aperture to we have to increase the shutter?
4- i didnt understand for what is the use of the EV +/-?

i thank you for your kind support

 

[donalson]

Hi,
maybe my inquiries are weird.
i am new photography learning to use my Nikon d90.
1 - i like to know why we use the ISO and why we change it (as understood from the guide, it is used for pictures lighting)
2 - as for the aperture, we lower it to open the lens, in this case the focus will be no longer on the subject taken, if we increase it the lens open decrease and the focus will be on the subject taken the picture for.
3 - is their a link between the shutter speed and the aperture. ex. when we lower the aperture to we have to increase the shutter?
4- i didnt understand for what is the use of the EV +/-?

i thank you for your kind support

http://www.thephotoforum.com/forum/...rum-photo-gallery/123160-tutorial-thread.html

also i've read great things about this book... the author also has a number of youtube vids that are worth watching. http://www.thephotoforum.com/forum/...to-gallery/114495-understanding-exposure.html

for basic understanding you can head down to the local library... they likely have a number of books to read though.

basically the ISO, aperture, and shutter speed are ways to get a specific amount of light to the sensor... ISO increases how sensitive the photo sensor is, a larger aperture allows more light in to hit the sensor, and shutter speed again allows more or less light to the sensor... longer shutter speed lets more light in.

each one does something different but in the end it allows more or less light into the photo... I won't go into it because it's so well covered (books or online)... but think of the proper light being a certain measurement... maybe 1 cup of water... you have different water sources to fill up the cup... all 3 have to equal out to the 1 cup of water or you will underfill the cup or overfill (under/over expose)...

enjoy the learning process