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Canon Cinema EOS Camera Systems
For all Canon Cinema EOS models: C700 / C300 Mk. II / C200 / C100 Mk II and EF / PL lenses.


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Old June 9th, 2012, 12:00 PM   #1
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New Ef-S Lenses and EMD

Somewhat cryptic in Canon's press release regarding the two new EF-S lenses announced yesterday is this statement about a new type of lens diaphragm:

"the EF-S 18-135mm f/3.5-5.6 IS STM features a circular aperture with an Electro Magnetic Diaphragm (EMD) which permits highly-accurate control over aperture settings."

DPReview adds in their description this little tidbit..."allowing smooth and accurate control over aperture for video shooting."

So I guess there are two questions: Is dpreview.com jumping the gun on the "smooth" thing? and if it turns out to be true, would this improve the fine aperture control on the C300?

Barry
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Old June 10th, 2012, 03:13 AM   #2
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Re: New Ef-S Lenses and EMD

Interesting questions Barry.

Having worked out what STM stands for ( Stepper Motor ) and read the available information I guess we will have to wait and see whether it offers smoother aperture control.

I think the image stabilisation will be excellent. But it's the advanced autofocus that this lens offer in combination with the new rebel T4i / Eos 650D that's really of interest.

But unless this lens has superb optics I don't really see it being that much of an addition for the C300 but I will certainly try it out when it hits the shelves of our local Canon dealer.
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