Digital BW, The Print

OK Austin - a quick guide to EF lenses.

ALL EF mount lenses are wholly electronic, with motors for focus and aperture 
setting. The only connection between lens and body are electronic contacts.

The Contax equivalent is the new N mount.

The various things that you can see attached to Canon lens specs:

USM - short for Ultrasonic Motor. Non-USM lenses use a so-called arc-form 
conventional motor for focusing, USM uses a piezoelectric driver to focus the 
lens.

There are also two kinds of USM lens, a consumer version and ring-type USM. 
The difference is that ring-type USM motors let you manually focus even when 
the lens is set to AF, consumer-type USM doesn't.

L lenses are premium products that use some sort of special technique to 
achieve their quality. The first L lenses had flourite elements, these days 
UD glass (ultra-dispersion or high refractive index) or aspherical elements 
are more likely.

Finally, IS is Image Stabilised. The jewel in the Canon crown as far as I'm 
concerned, these let you use much slower shutter speeds hand-held than 
conventional lenses.


On Wednesday 30 Jan 2002 5:27 pm, Austin Franklin wrote:
> Thanks Jerry.  It's interesting that Canon doesn't say this on their web
> site!  They are VERY specific about the EF lenses...
>
> Are the L series lenses fully electronic?
>
> Now, to bring this BACK on topic...what about B&W?  Does the D30 give
> comparable B&W to 35mm B&W?
>
> > I have a canon L lens, and it works perfectly with my D-30. (17-35mm).
> >
> > Jerry
> >
> > shaungranleese wrote:
> > > That is an odd link they provided but not the only totally out of
> > > date piece of info on Canon's website unfortunately. The link should
> > > really have been to http://www.usa.canon.com/eflenses/
> > >
> > > All the lenses I listed function with the D30, 1D and all other EOS
> > > cameras.
> > >
> > > SG
> > >
> > > --- In DigitalBlackandWhiteThePrint@y..., "Austin Franklin"
> > >
> > > <darkroom@i...> wrote:
> > > > Hi,
> > > >
> > > > Well, the Canon documentation specifically says the EF series
> > >
> > > lenses only
> > >
> > > > (and I quote from their web site specs for the D30):
> > > >
> > > > "Lens mount - Canon EF mount (full electronic control type)"
> > > >
> > > > as well as:
> > > >
> > > > "Lenses used - Canon EF lenses (focal length/angle of view
> > >
> > > conversion factor
> > >
> > > > is approximately 1.6X compared to full-frame 35mm filmformat)"
> > > >
> > > > with a provided link to (I assume) all the EF lenses:
> > > >
> > > > http://www.usa.canon.com/camcambin/cameras/lenses.html
>
>
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