Canon SLR lens how to choose?
to sum up:
1,17-40mm for landscape.
2,85mmf1.8 for portraits.
3, the future to consider 70-200mm (with white or small white, whether with anti-shake, by your), for telephoto theme.
The combination of the three lenses, fixed variable combination, focal lengths reasonable, no loopholes, or more ideal.
3, if you do not meet the 18-200 head of the picture quality, but also need wide-angle shooting scenery, it is recommended on a 17-40mmf4L head, which is a very cost-effective Canon wide-angle zoom head. The only thing to do is that the lack of telephoto end, only through the other lens to make up. Also, travel photography, telephoto end usage is low, you can temporarily do not buy, after the need to re-purchase according to their own.
2, even if the high quality requirements, then 24-105 is not suitable for 50D use. Because 50D is a non-full-frame camera, the lens will have a 1.6 times after the coefficient, that 24-105 multiplied by 1.6 after the 38-168mm, the telephoto end seems to account for cheap but wide-angle loss is serious, almost no Wide angle at all. So this lens is not suitable for use in non-full frame machine, it was originally as 5D2 full frame machine sets of head with. Some people say that you can use the patch to make up for this approach is feasible, but the specific operation is more trouble, a trip down to do a few can, but if you need to do a bunch of wide area scenery, it weighs you.
1,18-200 lens image quality is weak, and 24-105 head picture quality is a lot worse. If you have a sharp picture of the picture, you can see the difference between the two. But can not say 18-200 can not be used, the head of the consumer groups are ordinary people, shooting is ordinary photography, not professional photography lens. So, if you are not so demanding on the quality requirements, the purpose of taking pictures is not to participate in awards, then this lens is still available.
