Capturing nature up close can be very difficult and challenging but the out come is very rewarding. With up close shots you can see the detail in the object. I find you see the object in a different way than you normally get to. With small insects the camera can get extremly close and capture photos as if you are eye to eye with them. You normally can not personally get that close to an insect and observe it as you can with a close up photo of it.
I find that when I am trying to get shots of nature up close the zoom does help some but the biggest factor is being patient and get up close to it. the less zoom used the more the photo is defined. With nature you can not expect the animals to come out of their natural habitat and come to you. I found that when I am able to go to their home and sit and wait for the perfect time to capture the more interesting the photos are.