A conservative marked in some regions, like US? Bigger looks more "professional"?
The size of the camera body for sure has nothing to do with balancing the lens, no matter the size, shape and weight of the lens.
The nature of the body has a huge impact of one's overall sense of any body+lens arrangement.
Suggesting otherwise is easily dismissed by anyone with experience in such matters.
If you do not find that to be true then you are in a distinct minority.
No problem using the Minolta apo 400 mm f:4.5 with the A7 handheld, also with a 1.4x teleconverter. I also used long lenses with SLR cameras for film that was about the size and weight of the A7.
A heavier/larger camera doesn't help - added weight just makes things worse.
...I always say to those that like/prefer heavier camera bodies - buy some (fishing or diving) lead, fix it to the bottom of your camera - but leave the rest of us, lightweight camera lovers, alone!
All the best,
Pedro
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Grip and balance is a personal preference.
As DFPanno posts, most people prefer grip and balance, but Magnar is right - not everyone wants right hand grip and balance, because some are fine with using the neck strap, or they prefer to use their left hand to hold the camera by the lens barrel. Others complain that holding the lens barrel by the left hand is more "tiring" because the lens barrel is much larger than the right hand grip. If you have to hold a 40 mm diameter pipe, versus an 80 mm diameter pipe, the larger 80 mm diameter pipe feels much more tiring due to its larger diameter.
ttan98 and a number of other posters above have already suggested there is presently no FE 70-200 f2.8 due to its large size/weight being not well matched to the compact A7 Series mirrorless FF body.
Best we follow my constructive suggestion, and encourage Sony to make EVF mirrorless FF in two, or even three different sizes, just as Olympus makes their m4/3 in
three different sizes [E-M10, E-M5 & E-M1], while Canon makes their APS-C dSLR's in
five different sizes: 100D/Rebel SL1, 1200D, 750/760D, 70D & 7D II.
Rumours abound of a Sony "
A9" in the pipeline, possibly late 2015, and this new Sony EVF mirrorless FF flagship will undoubtedly be
bigger/heavier than the current A7 Series.
Meanwhile, for those who are unhappy about Sony's direction, and that the smaller A7I's grip and body has
grown into the A7II's larger grip and body, as another poster suggested somewhere, why not Sony make a smaller entry level EVF mirrorless FF Sony
"A5" - that will ensure that everyone's tastes are happy.
Magnar, let's not get too nerdy over this personal preference grip/balance issue.
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Personally, I'm fine when my old dSLR APS-C Canon 70D uses the small lightweight EF-S 18-55 STM stock lens, but when I use the big/heavy EF-S 17-55 f2.8, or the EF 100 f2.8 Macro with ring flash, I must don my BG-E14 battery grip - for a decent grab.
I think EVF mirrorless is the way to the future. I'm just waiting for technology to improve, and iron out the bugs in the autofocus AF, and some fast f2.8 zooms aka 16-35 f2.8 UWA, 24-70 f2.8 standard zoom, and 70-200 f2.8 teles would be really nice, and a bigger/heavier EVF mirrorless FF flagship body to match...