There is no fixed rule for landscape lenses but wide angles are good : )
Mainly wide angle 16mm to 50mm standard to fit the scenes in, although I use just about any lens if the image I “see” needs it. A wide angle zoom is a good idea as you may not always be able to move around the landscape for the best shot.
I have used all sorts of lenses for landscapes…macro, telephoto, wide angle, standard. It doesn’t really matter as long as the image says what you want it to…there are no “rules” as it were.
Remember though, that with a wide angle lens, you have more latitude when it comes to depth of field or the appearance of depth of field, i.e. you can shoot F2.8 and still “appear” to get much of the shot in focus (unless you have foreground interest which will kill that theory).
Similarly, using a telephoto and zooming in on a subject gives way less latitude and it can be difficult to obtain good depth of field if you are concentrating and focussing on a particular object in the frame. If the scene is “flat”, i.e. no foreground interest, you should get greater depth of field even at f2.8.
These first two images were taken with a wide angle, 24mm lens at f2.8 and f8, remember, f2.8 generally gives a very shallow depth of field and f8, good or deep depth of field…
You can’t see a huge amount of difference until you zoom in to 100% and even then it is minimal and the wider your lens is, the less noticeable it becomes. However, when you start to use telephoto lenses such as a mild 70mm in this case, the effect is much more apparent…
Beware though, because even when using smaller apertures such as f8 and f16 and zooming into something in the foreground…the longer the focal length of the lens (i.e. 200mm, 300mm etc), the shallower the depth of field becomes regardless.
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