Tallyther
Junior Member
Posts: 27
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I'm new at this too so take what I say with a grain of salt. Your 2 main lens cover a lot of range. I have the exact same lens I used on a 40D which isn't enough difference from your camera to say the pictures would be better or worse. Canon and many sites have short sections for recommended uses for each of these lens so I would start there.
I have upgraded to much more expensive "L" lens and learned very quickly that while they can produce better images, its the operator that must know more and put more effort into it to get the premium goodie out of it. The bottom line is you need to experiment with them awhile and don't assume one is better than the other as both produce excellent images. The two main factors are always how much light do you have and is the object likely to move. So start off by learning to compose your shots and that will often tell you whether you need to use a longer or shorter focal length.
Once you do the above you will begin to formalize your own opinion based upon how much effort you are willing to put forth. For example, you can shoot birds with any size lens known. But are they large or small birds? The three main issues though remain what are your abilities, the camera's abilities, and how much light do you have available. If you can get the birds to come to a blind your in or if the birds aren't afraid of you, you can use the 28-135mm. I have some great bee and hummingbird shots at 70mm. But if the birds are small and scared you probably can't get any closer than 30 feet and will need that 300mm to be able to compose and crop it the way you want. If you're shoot eagles well maybe because of composition you need to be further away so having a long lens is counter productive. If its bigger animals then using the 300mm may be too long to fit the subject into the frame right. Composition is important to demonstrate natural surroundings. Otherwise take the 28-135 to the zoo. Many nice shots can be made there, even in cages. But you will quickly learn you can't compose the way you want and light is often limited.
Hopefully the above demonstrates that the need to decide which lens to select is not about what it can do so much as what do you want to do with it? Most good pictures are related to proper composition matching the ability of the camera's resolution so you can enlarge it without it getting grainy beyond what's acceptable to you. What's good to you may be different than what I think. But it's your shot so your satisfaction is most important. If you want blurred backgrounds then you have to select a lens that the ability to compose as you want and have a relatively small depth of field. But aside from everthing else said, the most important thing remains if you don't have enough light you can't get sharp detail! Study the object! If you can't see the detail in the frame you're not likely to find it in the photo.
Your question is so broad it has many answers. I've tried to give you an overview of how you can draw your own conclusion beyond what you can read on the lens selection table on the Canon web site.
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