nightpiper
Senior Member
You're comparing equivalent focal lengths here; what CYRN was trying to put across is that a a physical 200/f2.8 for fourthirds will not be much smaller than a 200/f2.8 for 135-format.
The fourthirds 200/f2.8 will be smaller as a smaller image circle is needed, but by not much if telecentricity is to be maintained.
Now, Oly can get away with a 35-100mm/f2 only because the smaller image circle needed. A 135-format f2 zoom will be *huge* as the sensor is twice the dimensional size of a fourthirds sensor, and therefore requiring a much physical lens to cast a sufficiently large image circle - even more so if they want it to be telecentric.
Rationale behind engineering the 35-100/f2? It's because they can, and no other zoom comes even close to matching it. It's a proof of concept lens (as with all the f2 zooms); a little bit of chest-beating to show that it can be done.
I'm actually comparing the FOV of both lenses. CYRN made ref from diCam comparison of the 70-200 vs 50-200 which i feel the disparity is too huge. I do understand his explanation of the physical size.
After looking at so many lenses from so many brands, i seriously dun think its becos they can't produce optics that good, but rather always compromising between practicality, usability & cost. Canon has a 200mm 1.8 & its huge. Nikon has a 200-400 2.8 & its also really huge. Oly has the 90-250 & its also humongous (ask microcosm about its maneuverability). I'm very sure co. like Pentax & CZ can also make exotic stuff but mainly tied down by the 3 main factors.
Dun misunderstood, i'm not bashing Oly. Its the rationale behind making something heavier & cost more than competitors that puzzles me. I've had a brief encounter with the 35-100 & yes, the quality is to die for. Showing off is one thing, usability & marketability is another.
Coming back to u4/3. From the prev explaination in the prev page, u4/3 is compromising all the strengths which 4/3 initially established. To me, that means there's not much diff from other brands other than the weight size factor.
I've also demo'ed that by using 3rd party lenses, the colour still looks very pleasing (to me at least). So by taking the lens out of the equation, what's left behind this "Oly colour"? Boils down to the sensor & signal processing techniques. These same reasons r preventing me from getting DSLRs with the NMOS sensor atm. Let's see what u4/3 has to offer.

Perhaps microcosm can give us a micro tease? :bsmilie::bsmilie: