The 28-135 is notorious for its lens creep. If your's doesn't display any you are lucky. The USM motor is faster than an STM motor, but the STM motor is quieter. The overall build quality of the 28-135 is probably better than the new 18-135, but the 28-135 suffers from a lot more chromatic aberration. The most noticeable difference for most people is the range. On a crop body, 28mm is not very wide. 18mm is a very significant difference. In general use, the 28-135 on a FF body provides a similar range to the Canon EF-s 15-85mm on a crop body. If you use full frame the choice is a no brainer since the 18-135 is for crop only. The 28-135 and the 18-135 STM both have full time manual focus, but the focus ring on the 28-135 has better control and damping while the focus ring on the 18-135 STM is electronically controlled, not as smooth or damped, and doesn't work at all if the power to the camera is off. Optically, the newer 18-135 if probably noticeably better in some circumstances, and is the one to use if you are using a crop body and are interested in video, especially with a newer Canon body like the 700D or the 70D. So, the choice of one over the other depends on the intended usage, the intended camera body, and an understanding of the limitations of each lens.

I miss-ordered a product from B&H. They shipped it to me and I discovered my mistake immediately on delivery. I called and was immediately given an RMA and I promptly returned it. After the fact, I realized that I would be in another location, probably, when the replacement was shipped. I PM'd Hershel and told him of my situation. He told me he would advise customer service when he returned to work on Monday. Well, I am at my "other" location and just received notice that my package will be here Friday. Folks, that is customer service above and beyond the call of duty. I want to thank Ari, the customer service rep and our own UHH member Hershel for terrific service.

Set the top Mode dial to M. Look on the side of your lens and slide the switch down to Manual Focus (MF). You'll see a red M at the stop left of the screen to confirm you are in manual mode.

The camera will allow you to select the subject by moving the lens from wide angle to Telephoto, with the zoom lever, until the subject is the size you want on the LCD screen or in the Electronic Viewfinder (your choice).

Use the Manual Focus Assist button (under the MF switch) to acquire accurate focusing of the subject when the subject is in the center of your LCD or EV screen.

If the screen is dark you need to adjust your aperture, shutter speed or ISO to capture more light.