600D wants a lens. I travel a lot. I like to go to places like the seaside and the west. Of course, I also want to take pictures. I want to go to Maldives.

The lens you mentioned for the subject is different. I'm afraid one lens can't meet all your requirements.

For the convenience of travel, you can use a lens with a large zoom ratio, such as 18-200, but you should be able to tolerate image quality and distortion;

Wide-angle is indispensable in the seaside and western areas, so if you don't need a large zoom lens, then wide-angle is necessary, such as 16-35 or 17-40.

I don't know if you like shooting some distant scenes. You need a telephoto lens if you like.

As for shooting portraits, the lens deformation in the middle focus part is small, and the background blur effect with fixed Jiao Da aperture is also good. Generally you can choose 50 or 85.

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Your subject needs at least two shots, one for traveling, from wide angle to telephoto; The other fixed focus is used to take portraits.

Of course, if you are not satisfied with the large zoom tourist head, you can also use wide angle+telephoto instead of tourist head, which has good imaging effect and the disadvantage is cumbersome.