06-08-2012, 09:57 AM
[quote name='Yakim' timestamp='1339138397' post='18761']
650D, 18-35 IS STM, 40/2.8 STM (pancack).
http://www.dpreview.com/news/2012/06/08/...-Rebel-T4i
Bearing in mind it's a Rebel and not XXD or XD I think they did a fine job.
http://www.dpreview.com/news/2012/06/08/...m-F2-8-STM
When considering the overall size of lens and camera I'm struggling to see the allure of pancake design, especially with the existence of the significantly faster 35/2 and 50/1.8. Maybe the STM will find lovers in the video realm but for stills?
BTW, based on what is currently known, does anybody understands how STM is better than Ring-USM?
[/quote]
as far as one can tell from sentences like this:" However, while hybrid AF is available with all lenses, smooth and quiet AF for video is dependent on the use of the latest STM lenses.".
STM:
1) silent compared to normal micromotors.
2) STM uses a stepper motor. Presumably this will allow precise smooth movement control, while a micromotor might take a bit to get to speed, so maybe the later is a bit more jerky.
regarding USM. USM is also silent, but how is the movement? As far as I can tell it's fast and accurate, so STM shouldn't really have an advantage over USM with respect to point B.
So, I presume the main difference is still cost. STM is now in the new pancake 40mm lens, which is a cheap lens.
ring USM could also be a bit larger, since it's around the whole lens. There is a disassembly, you can see it's actually not that small:
http://www.photoscene.com/sw/tour/inside.htm
650D, 18-35 IS STM, 40/2.8 STM (pancack).
http://www.dpreview.com/news/2012/06/08/...-Rebel-T4i
- AF in LV and video
- Touchscreen
- Master built-in flash
- Digic 5 processor
- All AF points are cross-type
- Built-in stereo microphone
Bearing in mind it's a Rebel and not XXD or XD I think they did a fine job.
http://www.dpreview.com/news/2012/06/08/...m-F2-8-STM
When considering the overall size of lens and camera I'm struggling to see the allure of pancake design, especially with the existence of the significantly faster 35/2 and 50/1.8. Maybe the STM will find lovers in the video realm but for stills?
BTW, based on what is currently known, does anybody understands how STM is better than Ring-USM?
[/quote]
as far as one can tell from sentences like this:" However, while hybrid AF is available with all lenses, smooth and quiet AF for video is dependent on the use of the latest STM lenses.".
STM:
1) silent compared to normal micromotors.
2) STM uses a stepper motor. Presumably this will allow precise smooth movement control, while a micromotor might take a bit to get to speed, so maybe the later is a bit more jerky.
regarding USM. USM is also silent, but how is the movement? As far as I can tell it's fast and accurate, so STM shouldn't really have an advantage over USM with respect to point B.
So, I presume the main difference is still cost. STM is now in the new pancake 40mm lens, which is a cheap lens.
ring USM could also be a bit larger, since it's around the whole lens. There is a disassembly, you can see it's actually not that small:
http://www.photoscene.com/sw/tour/inside.htm