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I find that I'm not very good with mid range settings.. i'm either using one extreme or the other. Is there any tips/practice techniques that I could do to improve?
For landscapes you're better not stopping down too far, most lenses are sharper at around f/8 - f/16. I generally use f/11 for landscapes and adjust from there if needed. To keep things sharp throughout I generally focus using the hyperfocal distance. See here... http://www.amateurphotographer.co.uk/technique/camera_skills/mastering-hyperfocal-distance-56978
I think what the OP means is that some shooters purposely use a limited DoF for their landscape shots. Creating an image that has a sharp foreground and slowly tails off, with the far background out of focus, but still with enough focus to make out what the objects are.
It seems to give the image more 'pop' and offers the appearance of depth more-so than just shooting at infinity or using hyperfocal methods.
I did see a nice example of this taken on a A7R with 55/1.8 it's much more difficult to do with a wide angle lens due to the larger DoF
Just experience really, you stop seeing it as aperture and more a dof setting.
Using my 50 for me is the hardest, too many options but fantastic when you nail it.
I tend to try to imagine the picture I want to get first and then use the settings that will achieve that. If you're trying to highlight something or draw attention away from something in the shot then you can use the aperture to your advantage. Then there's other times when you want to show everything in as much detail as possible
Does your camera have a depth of field preview button?