Exposure setting and lens question

Started Sep 13, 2011 | Discussions thread
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Engandiyur
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Exposure setting and lens question
Sep 13, 2011

I am a novice in SLR photography and I own A55 and three lenses. I just want to know how you people set exposure setting in A, S and M modes. Do you use any light meter for that? In my case, I just look through the EVF or LCD and see if the subject is properly exposed and just trigger the shutter, that's it.

And let me ask one more question here so that I don't have to write one more post. This is the question:

My 75-300mm requires more light at 75mm @ f4.5 than my kit lens at 55mm f5.6. Why is it so? Actually it should be the other way round since 75mm is 2/3 stop wider than kit lens. Does the focal length also affect the light coming into the sensor?

Please clarify my doubts. Thanks in advance.

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