Your queation is not worded very well. I'm not sure what it means, exactly. But...I guess a 70-200 or 70-210, with an f/4 conctant maximum f/stop, is smaller,lighter, and less-noticeable/threatening, and is MUCH easier to carry than an f/2.8 lens....over the decades, there have been MANY 70-210 models in the f/3.5 to f/4 max aperture range, and many are pretty compact. ame with 80-200 f/4 models....
I've owned f/2.8 models of 70-200 and 80-200 (three) and multiple 70-200 or 80-200 f/4.5 or f/4 models...
THESE DAYS, f/2.8 is NOT a big advantage,and many expert shooters (high-lvele shooters, people like Kirk Tuck,to name just one), who feel that in a day-long shooting situation, the f/4 lens is actually BETTER, in terms of the pictures it gets, over an f/2.8 lens.
For $500 less, an f/4 lens makes some sense; in name-brand lenses, the difference in price is even MORE...
I am not a fan of 70-200 f/2.8 lenses really, and sold both of mine a year ago....going with primes now, since I mostly shot at 200mm, and around 140mm--and at f/6.3 or f/7.1 MOST of the time! The big, fat f/2.8 tube was just a waste of space. For me,at least. And f/2.8 is not that fast when other lenses offer f/1.8.
Agreed. Since I got the 135 1.8 I have not used my 70-200 even once. Considering selling it and getting another prime.
Yeah...I've been carrying a smaller,lighter tele lens, the 180mm f/2.8 AF-D ED~IF Nikkor...180mm, handier than a 200 prime in closer situations, and with 24-MP FX, it's sharper by a bit than the 70-300 VR-G for beach trips and summertime scenic shoots, and the 180 has prettier bokeh, IMO, than the zoom, plus it's wayyyy faster at 180mm than most variable-aperture zooms are. As to my tendency toward 140mm-145mm...weird, but browsing my EXIF data shows a strong tendency to that range, so the little 135mm f/2.8 Ai-S Nikkor prime, a very small lens (3/4 the length of a 12-ounce soda can) that's very sharp has come out of retirement.
I sold the Canon 135/2 and the Nikkor 135/2 Defocus Control and the 135/2 Ai-S Nikkor last year; if things continue, I might rebuy a FAST 135 tele, but then again, maybe not...I dunno...
I recently bought a Tokina 70-210 f/4~5.6 pawnshop lens for $29; it's SMALL! About the size of the 135/2.8 Ai-S Nikkor; again, small, but slow in f/stop, but then again, I bought it for beachside trips where I want a _SMALL_ lens that looks inconspicuous and non-threatening. And that is an issue; the f/2.8 70-200 lenses look HUGE to non-photo type people...they look "pervy"...people sort of freeze up when they see a 3-pound, foot-long-lens-and-lens-hood aimed their way. I remember the days of manual focus, when the three Nikkor primes I used the most were ALL about the SAME size! The 85mm f/2 Ai-S was about the same size as a 50mm f/1.4 Ai-S and that was about the same length as the a 35mm f/2 Ai-S, and people were nonplussed; now though, the 50/mm f1.8 G is HUGE for a 50; the 85mm f/1.8-G is chubby, the wide-angle G-series primes are kind of big too.
SIZE of the lens is a factor, I think, in how people react in front of the camera,
at the very start of an encounter or interaction. if the lens is _small_ and non-threatening, I personally have four decades' worth of experience that people are much more at-ease than they are with a massive, obnoxious camera lens that looks like it sees down to pore-level,etc.. Consequently, if you only shoot 1,2,3,4 frames of people, you want them to not feel threatened by the lens! In a photo shoot with a model, or some camera-seeking person, then a big lens might even be a benefit, make you look more "pro",or whatever. But at street fairs, festivals,public gatherings, I really,realllllly think that the smaller then lens, the less-conspicuous the lens is, the better, for most subjects. Anyway: that's why a 70-200mm f/4 VR-Nikkor is the next lens I want to buy, not another f/2.8 stovepipe section.