23rd December 2004, 12:06 PM
Difference between internal zoom and conventional zoom?
Hi again, just wondering if there's any difference between internal zoom (sorry, don't know if this is the correct term) or those conventional zoom?
for example, sony w1 vs canon ixus 40 ??
how does internal zooming works, and which is better for pictures?
23rd December 2004, 08:13 PM
hmm.. no one able to explain my qn?
23rd December 2004, 09:36 PM
23rd December 2004, 09:58 PM
Are you trying to say internal focussing (IF) vs normal focussing ?.
23rd December 2004, 10:23 PM
Let me try. My understanding of "internal" versus "conventional"(external) zoom
There are some zoom lenses that do not get longer when one zoom out because the zooming mechanism is constructed internally. An example is the Canon 70-200 f2.8.
But the Canon 100-400 zoom lengthens considerably when you zoom out, because the zooming mechanism was designed that way.
Of course there is a slight inherent advantage to have internal zooming, because the longer the lens, the less stable it is.
But I am unable to tell if the inherent mechanism of the internal versus external zooming makes for any real difference in the optical quality. There is no doubt that the 70-200 is sharper than the 100-400, but there are other optical considerations to explain the sharpness.
One of my favorite lens is the now out of production Angenieux 45-90mm. It is design to have an external zoom. But boy, is it sharp!
23rd December 2004, 10:51 PM
yeah, that was what i was trying to say.. lol. thanks for making it more understandable.
Originally Posted by student
well, i think i prefer external zoom, cos that's how most cameras are built. and i just dun see how those "internal zoom" cameras will succeed over "external zoom" types anytime soon!