How good is Nikon for landscape photography?

How good is Nikon for landscape photography?

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All i want to know is focal length and aperture relation?

ok, so i have Nikon D7000 and i know the basic relation of shutter speed aperture and iso. All i want to know is focal length and aperture relation.

as i zoom in the camera the f stop increases eg from 3.5 it becomes 5.6 some one told me that having large aperture gives more blurry background. (ie: f3.5 will give me more blur than f5.6, if i am not wrong)

but when i zoom my lens to 140mm minimum f value available becomes 5.6 and it gives me more blurry background than f3.5 at 18mm

why so? Am i wrong at some concept please make it clear:) thanks in advance

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Nikon D60 will not let me set aperture ring on lowest number?

I have a Promaster Lens and whenever i try setting the aperture ring to the lowest number it tells me to set it to the largest number on the aperture ring. Why? D:

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