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Originally Posted by kamion
One question though, why is it some times I can only get the f number down to 5.0 and some times, down to 3.5? I don't understand!  Also, the aperture preview button, it only worked once and I couldn't get it to work again.  |
If you're using a zoom lens the effective aperture changes (gets smaller) as the focal length increases. It's the downside of the convenience of a zoom I'm afraid. Some zooms have a fixed aperture all the way through the zoom range, but they tend to be very expensive.
The Depth Of Field Preview Button only works if your lens is stopped down from it's maximum aperture. It could be just that? If it isn't doing anything when the lens is stopped down (small aperture) then it might be a fault on the camera.