I just bought a Tokina 11-16mm lens for my Nikon d40 and it doesn’t allow auto focus, only manual focus. Any tips on how I could make sure my subject is focused properly? Is there a certain mode I should be on? I will be mostly photographing landscape and architecture. Thanks in advance for your help!

Look on page 28 of your user manual.

It discusses the fine electronic range finder in the viewfinder

Anyone have any good tips/ideas? Any thoughts are appreciated.

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I want to do work on landscaping the and lawn and need to get ideas that would complemtnt with home architecture. links to websites, additional tips/ideas would be really helpful. thanks

Add a picture of the area that you want to work on please, and I will tell you, One set up won’t work in two different places.