thank you, i see they have some used 18-200 lenses too, i have been looking at a bunch of photos people have taken with those lenses and they both look great. so i guess my main choice is a bit more convenience or a bit more zoom.
one thing i have read a few times, you are probably better off getting a DX lens if you have a DX camera, something about a DX camera wont use the whole lens or something like that, i did see a few people say that might actually be a benefit, i don't know, but i am starting to think the 18-200 might be my best bet. the galory of 300+ photos that are said to be taken with that lens, most of them look great. a few were pretty bad but i am guessing that person did not know how to use their camera.
Ok, the straight and narrow on FX and DX lenses on an DX body. If you can afford it get the FX lens all day and twice on Sunday, hands down, no question. Here's why. The best part of any lens is the center of the glass. As you start getting out to the corners you will always have some issues, it's just a function of the lens design and there is no way to avoid it. It happens on all lenses - the more expensive the lens, the less dramatic the difference - but the center of the glass will always be better than the corners.
When you use an FX lens on a DX body, what happens is your using the best part of the glass - the center, and not the edges. If you use a DX lens on a DX body, yes.. it does use the whole lens. But this is not a benefit, because it is being forced to used the edges as well. So if you can afford an FX lens, it is better to have one on a DX body than a DX lens.
Good example, I own a 70-200 mm Sigma OS f 2.8 lens. When you go out and read the lens reviews you'll see they are mixed, more than a few reviews will complain about vignetting or softness in the corners. If you read a little further you find out why - they are using high end full frame cameras to test the lens.
The guys who are using this same lens on a DX body will never mention such issues, and if they do they only do so in relation to someone elses review. Why? They don't see the problem because their camera isn't using the edges of the glass, just the much better section in the center.
Now, that's not to say that all DX lenses are garbage or that they can't be used or whatever, but if your really want the best image quality and all the other factors are equal, you'll get better results out of an FX lens on a DX body than you will out of a DX lens. Just keep in mind it's rare that all other factors are equal.. lol.
Ok, now me I would prefer the 70-300 mm because I have owned one before and the images it can take are truly remarkable. I've stayed away from lenses that have a longer variance in focal length like say an 18-200, 18-300, etc - because while these lenses do "OK" as a function of their design you'll run into certain weaknesses - they are never going to be as good at 300 mm shot wide open as the 70-300 mm can be - etc.
That's not to say that they are useless lenses - people do get some really good use out of them. But if you want the best IQ, you'll be better off with lenses that don't have to cover such a wide focal length. If IQ is less important than the convenience factor, well then maybe that would be a good choice for you. Just sort of depends on which works best for you.
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