Lawrance Lee wrote: > > I'd buy the 28-70mm L lens except that it telescopes externally, so I really > find that hard to accept, since this would mean more likelyhood of dust > ingress. Can anyone allay my fears here? >
I've stopped thinking about dust inside lenses a long time ago. While it obviously is not a good thing, I never noticed any significant effect, such as a degradation of image quality of a certain lens over a longer period of time. I've bought my 28-70L used and it had some dust inside. I used it myself and it has accumulated some more dust over time. The image quality is still excellent. > My question to you is - does the L lens leave the 28-135mm IS lens for dead > and secondly, does it telescope internally or externally? When zooming, > does the front element rotate? Finally, does it use a 77mm filter size, and > are you putting up yours for sale? :) I have both lenses, they suit different purposes. I can take an image of interiors without using a tripod at f/5.6 or f/8 with the 28-135 due to IS, OTOH if I need a fast shutter speed for moving subjects, the 28-70 rules. Also when I want the shallow DOF of the f/2.8 aperture. And last but not least for better image quality at identical apertures when used with fast shutter speeds or tripod mounted. Both lenses telescope externally when zooming, the front lens doesn't rotate. The 28-135 uses a 72mm filter size, the 28-70 uses a 77mm filter size. And no, I'll not sell any of them ;-) Thomas Bantel * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
