It is extremely difficult to judge what someone else considers bulky, heavy, large etc. I find the D5 the ideal size and the 24-120 f/4 VR of an appropriate size to go with it, though for various reasons prefer to use the 24-70 f/2.8 VR, like faster focusing. That lens too is about the right size for me.
Well, it needs to fit the respective bags…
Huh. I think I need a better plan for a gearshot camera.
Clearly your parameters are different from mine. The 35-70 is a film era lens and In think you will find a more recent lens to be an improvement, unless you're into aperture rings and slow noisy AF.
"Film era" is less of a warning sign than "5MP digital sensor era": a low-ASA film could have quite higher resolution than early digital cameras.
The aperture ring is locked on my CPU lenses (using the camera's aperture mechanism instead gives me all of A, P, M, S and ⅓ stops); the D750 needs a CPU to recognize AI-S though. Autofocus on the 35-70mm is actually pretty fast; the torque is more of a distraction than the noise. And since the front lens rotates when focusing, polarizers are awkward to use.
The lens has limited range, and it occasionally gets crazy veiling flare in backlight (quite unpredictable). But it is super sharp, to a degree where you don't want to engage distortion correction because it introduces larger (and staircased) unsharpness than what the lens has on its own. And you are lucky because distortion is so low that you indeed very rarely need distortion correction.
And being able to forego sharpening completely because the lens is sharp wide open
and does fine without either distortion correction or even slight sharpening means that your noise reduction does not need to deal with sharpening artifacts. That really helps with low-light processing.
And it fits the bike handlebar box with the hood on ready-to-use. I've brought a full backpack of lenses to my father's birthday party and ended up shooting every single shot with that lens. It has a non-frightening size with a mere ⌀62mm filter thread diameter.
If the 24-120 really is too bulky you might consider a 24-85 VR which is smaller. There's also the 24-70 f/2.8 G which is smaller than the VR version.
You'll soon find yourself using the wide end of any of these lenses.
I have a 12-24mm zoom lens where I rarely use anything but 12mm. But that is not really for people photography.
I know there are a good number of proponents of mechanically coupled AF and AF-D lenses with aperture rings. I'm not one of them, I'll take AF-S G or E lenses in preference to those. I wasn't using my older lenses and AF-S is so much faster and quieter.
I am not married to the aperture ring. Considering the number of lenses one sees being sold with non-working autofocus, at least early iterations of AF-S seem like a mixed blessing, and foregoing autofocus motors and VR helps in getting more compact size. For a 70-300mm zoom, you definitely want to invest in VR. But on the lower focal lengths (and FX also helps), 1:2.8 is a reasonable deal about balancing the effects of camera shake and subject movement.
I am aware that Nikon does not do screwdrive on FTZ or its teleconverters. So at some point of time, you don't get more functionality with screwdrive AF than with broken AF motors. But I am not there yet.
And I do use a 70-300mm 1:4.5-5.6 VR rather than a 70-210mm 1:4-5.6 AF and will probably at some point of time sell the latter, having hardly used it. But on its long end it is nicer when held steady than the 70-300mm on
its long end. Which does not help in practice but makes the lens more likeable.
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Dak