Canon STM lens (Page 2): I sent you a PM about a lens I have you might consider.

DaveJ Loc: NE Missouri

I sent you a PM about a lens I have you might consider.

speters Loc: Grangeville/Idaho

Dave327 wrote:

STM in Canon lexicon means a “stepping motor” for ... (show quote)

Of course it is a feature, not just a description!!

nadelewitz Loc: Ithaca NY

The most significant function to me is full-time manual focusing ability, without switching the lens to MF. Accomplished by setting camera for back-button-focus, and just not touching the BBF button.

This is possible with Canons on the Ultrasonic lenses which have a focusing scale, either in a window or an LCD display like new newest EF 70-300 f/4.5-5.6 IS II USM.

No other Canon lenses offer full-time manual focus ability while the lens is set on AF.

mwsilvers Loc: Central New Jersey

nadelewitz wrote:

The most significant function to me is full-time manual focusing ability, without switching the lens to MF. Accomplished by setting camera for back-button-focus, and just not touching the BBF button.

This is possible with Canons on the Ultrasonic lenses which have a focusing scale, either in a window or an LCD display like new newest EF 70-300 f/4.5-5.6 IS II USM.

No other Canon lenses offer full-time manual focus ability while the lens is set on AF.

I don't care for the STM or Nano USM approach to full time manual focus because you have to power the lens first by either pushing the shutter button halfway or the back button.

miked46 Loc: Winter Springs, Florida

This is a good lens for photo's and also for Video, as the STM usually will be very quiet during focusing during video

nadelewitz Loc: Ithaca NY

mwsilvers wrote:

I don't care for the STM or Nano USM approach to full time manual focus because you have to power the lens first by either pushing the shutter button halfway or the back button.

I don't know about Nanos. I have several USMs, like I described, and the 70-300 IS II that I don't have, that don't require pushing any buttons when manual focusing. You leave the lens on AF, don't press the bbf button, and manual focus. There ARE USMs that do NOT do full-time manual focus this simply, if at all.

mwsilvers Loc: Central New Jersey

nadelewitz wrote:

I don't know about Nanos. I have several USMs, like I described, and the 70-300 IS II that I don't have, that don't require pushing any buttons when manual focusing. You leave the lens on AF, don't press the bbf button, and manual focus. There ARE USMs that do NOT do full-time manual focus this simply, if at all.

Like the STM lenses, nano USM is fly by wire. I believe there is no direct mechanical coupling of the focus ring, and requires power to work.

nadelewitz Loc: Ithaca NY

mwsilvers wrote:

Like the STM lenses, nano USM is fly by wire. I believe there is no direct mechanical coupling of the focus ring, and requires power to work.

Ugh. I don't want one of those then.

Thumper26

I have the Canon 55-250mm STM lens as well and I am blown away by its performance, especially for its ridiculously low cost. I would have liked a wider angle than the 55mm, but I have augmented it with Canon's 17-55mm f/2.8 lens which also provides me with excellent results, but carries a stiffer price tag. These two lenses, plus the Canon 10-18mm lens comprise my general walk-around "kit". When I want to walk around less incumbered, I take just my Canon 15-85mm.