Road Train !!!!!!!!!!

by Russell McMahon

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2
votes
4answers
2k views

What are the benefits of Av vs. Tv vs. Manual exposure modes?

So what's the benefit of using one over the other? The way I understand it, in Av or Tv, you only have to adjust the shutter or aperture, and the rest is done automatically for you...is this correct? ...
3
votes
2answers
1k views

How does the second wheel change the shutter speed in aperture-priority mode on my Nikon D90?

When I am in aperture mode in my d90 camera, I have noticed I can also change my shutter speed by clicking the rear wheel. Is that a bug? How is it possible? If it is not a bug, how do I know the ...