I want to buy a SLR, but I don't know how to choose a lens.

1.550D equipped with 18-55IS and 18-200IS. If you like photography, it is not recommended to go to 18-200, which is not much better than telephoto digital. You equip 18-55 first, study first, and then change.

2. As far as lenses are concerned, as far as zoom heads are concerned, there are mainly the following types:

About 16-35 F2.8 10600. Wide enough, large aperture, excellent imaging, not enough close-ups of portraits.

17-40 F4 5000 or so. Wide enough, F4 aperture, blur slightly insufficient, portrait close-up.

24-70 F2.8 around 9600. Wide angle, large aperture, zoom king, excellent imaging, slightly heavier.

24- 105 F4 6500 or so. Wide angle is average. F4 aperture and appropriate focal length. Nice imaging.

15-85 F4-5.6 5000 or so. Wide enough, good imaging and proper focal length.

Approximately 17-85 F4-5.6 3500. Wide enough, average imaging and appropriate focal length.

18-55, 17-85, 18- 135, 18-200, entry-level dog head, general imaging, spending money to buy a focal segment, without focusing motor at all.

In terms of focusing:

50 F 1.8 (small spittoon) about 650 ultra-high cost-effective large aperture pan/tilt, good imaging, very light, no focusing motor.

50 F 1.4 2500 large aperture pan/tilt, with good color imaging and focusing motor, is a good choice if you want a large aperture of 1.4 regardless of the factory.

85 F 1.8 2800 beauty head with good color imaging and focus motor, but 500D can't be used indoors.

Regarding 135 F2L 6500, the awesome portrait head can be said to be the top three in Canon.

Others, such as 35L, 50L, 85L and macro lenses, are not recommended for the time being. It is estimated that LZ will have to do his homework to get into these tens of thousands of focusing lenses.

Deputy factory directors will not recommend them one by one, and the individual differences are too great, and it is generally difficult to get rid of second-hand ones.

3。 It is recommended to use the SD card of Sandisk 8G class6 as the memory card. Slow shooting is not easy to use, and 8G is enough if you don't travel.

Answer to the supplementary question: If LZ has requirements for imaging, never buy 18-200. Although the focal length of this head is good, the imaging is similar to that of 18-55. It doesn't make sense to buy a dog's head for more than 3000 yuan. Why don't you practice with 18-55 first, and then change the red circle later?