On 6/9/05, Huber, Richard, discombobulated, unleashed: >I seem to remember a complaint by several people that the zooms cause >MORE dust on the sensor than the primes. Evidently, by changing the zoom >length, the influx of air and dust went straight to the sensor on taking >a photo. Whereas a prime, once attached does not continually draw in, or >expel air from the mirror cavity.
IIRC all lenses move elements internally to focus. By design, they are effectively weak air pumps. If the physical size of the lens changes a lot when focussing, then perhaps not so weak a pump..... Cheers, Cotty ___/\__ || (O) | People, Places, Pastiche ||=====| http://www.cottysnaps.com _____________________________ * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
