RobDickinson Offline Upload & Sell: Off
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BigSky1 wrote:
Are the optics in EF-S lenses constructed/configured so that they are "optimized" for use with APS-C cameras? I know that they are built only to fit APS-C cameras; but, are they constructed in a manner different than an EF lens such that their optics make better use of/work better with the APS-C sensor? I hope that makes sense.
Being able to get the rear element closer to the sensor does give canon some advantages when designing lenses.
From wikipedia:
"which enhances the possibilities for wide angle and very wide angle lenses, enabling them to be made smaller, lighter (containing less glass), faster (larger aperture) and less expensive"
Which in theory is great, in practice canon have the slowest crop wide angle lens and none of them can be called cheap (outside of the kit lenses 18/55 and 55-250).
Also note that at normal to tele focal lengths the rear element is always a fair distance out and the image circle is always big enough for 135 so ef-s has no advantage.
gwaww wrote:
I said EF-S 'type"
Yes , sorry was just making it clear.
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