ISO, shutter speed, aperture, image noise is determined by the lens or the dslr?

[kj lee]

1)which of the factors are determined by the camera or the lens?or both.

2)whats are all the difference in the efs18-55mm f/3.5-5.6 and the efs18-135mm? is it only the zooming distance? no effect on the image ?

3) i heard that many ppl said that a fast lens is good in low light photography...eg, 50mm f/1.8 ii
can fast lens produce such image?



4) if i set a long shutter speed, then does this mean that a fast lens would help to reduce the time? then the advantage of a fast lens to be fast will be "wasted" if i set a long shutter speed?

5)for instance, such images,where i can play with the "light and colours"
Image 1
Image 2


when everything is put to constant, same focal length, same shutter speed, same effect, same iso,
but the only difference is the lens, eg, using efs18-55mmf/3.5-5.6 and 50mmf1.8ii,
can i produce the same image? is there difference in image noise? what is the difference then if both lens were to be compared?


p/s: please leave your email so i could contact you if i have more questions

[Digidave]

First off, be aware of the website's photo size limitations. Look at the FAQ section for details.

Secondly, noone should be leaving their e-mail address on any website, so please don't even bother to ask for it. Unless of course they really like SPAM.

Thirdly, you seem to have a lot of questions. Have you done any research at all?

[Digidave]

Nicole! My hero!!

[RichardTaylor]

Other people on the site may be interested in learning more about a subject so I tend not to use personal messages or emails.

(1) ISO & shutter speed - Camera only. Aperture is the lens.
Noise is a combination what ISO you are using and how well the pic is exposed.
High ISO means more noise .
Under exposure means more noise.

See this exposure tutorial.
Exposure (1) A balancing act

(2) For practical purposes very little especially at smaller apertures.
See the reviws here.
http://www.the-digital-picture.com/R...s-Reviews.aspx.

(3) Any lens is good for low light photography, if you are using a tripd and shooting static subjects.
Using a fast lens may mean you do not need to use a tripod and/or you can capture action in low light.

See this tutorial.
Night Photography:2 - In the street.

and see this tutorial re using fast lenses.
Lenses #6 - Fast lenses

And see this tutorial - Cityscapes at night.
Night Photography:1 - Cityscapes.

(4) If you are using a fast lens and not using it wide open the the Image quality (IQ) may be better (lenses usually perform best when stopped down at least a couple of stops). Shooting with a F2.8 lens at F5.6 will probably result in better IQ than using a F5.6 lens wide open.
This may be lens dependant (More expensive, usually the better IQ )

(5) With everything constant the lens has no effect on the image noise. See question 1.