Some of my prior comments on Canon focusing motors were less informed
than they could have been :-)

Some low end Nikon cameras have no focus motor in the body. High end
ones do have.
All Nikon DSLR bodies can focus motor-in-lens lenses.
That much I got right.

NO Canon DSLR bodies have focus motors.
ALL Canon 'digital' lenses have in--lens focus motors.
So focus motor location is a non-issue for Canon. Nobody has them :-).

STM is a Stepper Motor style of in lens focus motor as opposed to the
more usual "USM" (ultrasonic motor.)
USM works on a ring warping piezo electric drive principle.
STM is newish. in some lenses only and targeted especially at video
use. It tends to be slower to focus than USM but quieter and smoother.

__________________

Re lenses.
Read reviews of all.
Lean towards a single better lens, BUT decide if los of eg 135-250
range is a major loss for you.

___________

The Canon T5i =3D =3D=3D  700D.
This is identical to a 650D except in a few extremely minor and almost
unimportant changes. See at end

    R

_______________________________________________


Good brief comment on STM + 650D here

650D was semi revolutionary in that it has SOME phase detect focus
capability in its main sensor. While most phase detect points are on a
seperate sensor block which is accessible only when the mirror is
down, the limited phase detect on-sensor + std contrast detetct from
the sensor leads to a superior mirror up focusing result.

One day sometime all DSLRs will have no mirror at all (not even
Pellicle) so will become DSL or EVIL cameras instead  and will supply
viewfinder + phase detect focus from the maon sensor. That day is not
yet.:-)

650D review here which covers 750D =3D T5i

        http://www.dpreview.com/reviews/canon-eos-650d-rebel-t4i

except for aspects covered here in T5i preview

     http://www.dpreview.com/previews/canon-eos-700d-rebel-t5i

______________________________

http://www.dpreview.com/previews/canon-eos-700d-rebel-t5i


With the EOS 700D/Rebel T5i, Canon's made an early move to replace
last year's 650D/Rebel T4i, though one with only very minor
refinements. Indeed the changes over the 650D are so subtle that it's
the older T3i/600Dthat stays on alongside the 700D - while the
too-similar 650D fades into the sunset.

The only real changes are that the 700D offers real-time preview of
Creative Filters in Live View mode, includes a redesigned new mode
dial that turns 360 degrees, and has a new 'upmarket' body finish.

... the 700D is essentially identical to the 650D, ...  carried over
include the 18MP CMOS sensor, a 9-point cross-type AF sensor, 3-inch,
a 1.04m-dot vari-angle LCD screen, and Full HD video mode. Its Hybrid
AF system was also brought over from the 650D, and while the
simultaneously announced 100D/Rebel SL1's Hybrid AF II covers a wider
area than the one here, neither is said to be any faster than the
rather slow implementation on the 650D.

The only other significant change made over and above the 650D is the
ability to preview and apply Canon's 'Creative Filter' processing
effects at the point of shooting, rather than adding them as a
post-shot process. This ability to preview the effect (as now offered
on the majority of cameras), makes it easier to pre-visualize how the
final result will look - helping to inspire the capture of images that
only work well in conjunction with the processing effect.
--=20
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