Main trade-off
Sony a6700 body
One SD slot. 4K120 narrows framing and disables internal proxies at 120p/100p.
Head-to-head
Sony a6700 vs Alpha 7 IV: a6700 keeps 4K120 and crop glass, A7 IV opens up full-frame lenses
The short answer
a6700 keeps 4K120 and crop glass, while A7 IV opens up full-frame lenses. Choose a6700 for 4K120 with its additional crop and media restrictions, or when compatible APS-C lenses already suit the job. Choose A7 IV for full-frame stills and ordinary-speed video with suitable full-frame lenses. A7 IV itself uses Super 35 at 4K60. Both offers are body-only, so price the complete lens setup before calling full frame an upgrade.
Before you choose
The reasoning and the trade-offs
Full frame can be a sideways move for the sports clip you actually want
If the weekly output is a slow-motion 4K clip from a child’s game, a6700 supports up to 120p while A7 IV stops at 60p. The larger sensor does not make up for the missing capture rate. a6700’s faster mode adds crop and disables internal 120p proxies, so a wider lens, suitable card and computer-side proxy step may enter the plan. A7 IV can still be the stronger purchase for full-frame stills and ordinary-speed video with suitable lenses. Decide from the finished clip and editing routine, rather than assuming the larger body is the next step for every hybrid shooter.
What this is based on
Explicit video inventories and a6700 proxy/card limitations. No measured sport autofocus or slow-motion quality ranking.
Main trade-off
Sony Alpha 7 IV body
4K stops at 60p and that frame rate uses Super 35. APS-C lenses do not provide automatic full-frame coverage.
Sony a6700 body
- Choose it for
- Your compatible APS-C E lenses already cover outings, and a smaller body is useful before adding the lens.
- You need internal 4K120 and accept the extra crop, mode-specific card requirements and lack of internal 120p proxies.
- Main trade-off
- One SD slot. 4K120 narrows framing and disables internal proxies at 120p/100p.
Sony Alpha 7 IV body
- Choose it for
- You own suitable full-frame lenses and want their wider stills or ordinary-speed video coverage in a room.
- Two SD-capable slots and full-size HDMI fit your recording or transfer setup, with the actual recording mode checked.
- Main trade-off
- 4K stops at 60p and that frame rate uses Super 35. APS-C lenses do not provide automatic full-frame coverage.
About this comparison
Sony a6700 vs A7 IV for family sport, indoor groups and retained E lenses. Check 4K frame-rate limits, full-frame coverage and complete kit weight.
These are plausible Sony upgrade alternatives for an E-mount owner choosing the upper APS-C body or an established full-frame model. The lens collection and video output can reverse the apparent sensor-size hierarchy.
Winner by situation
Start with what you need it to do
Record internal 4K120 for a slow-motion edit
A7 IV stops at 4K60.
- Sony a6700 body
- Better fit
- Sony Alpha 7 IV body
- Not suitable
Keep a compact compatible APS-C lens set
A7 IV needs crop mode with those lenses.
- Sony a6700 body
- Better fit
- Sony Alpha 7 IV body
- Caution
Use full-frame lens coverage for indoor stills
A7 IV can use the larger image area.
- Sony a6700 body
- Caution
- Sony Alpha 7 IV body
- Better fit
Minimize body weight before adding the lens
a6700 saves 165g on the stated body weight basis.
- Sony a6700 body
- Better fit
- Sony Alpha 7 IV body
- Good
What matters in practice
The differences that matter
Full frame can be a sideways move for the sports clip you actually want
If the weekly output is a slow-motion 4K clip from a child’s game, a6700 supports up to 120p while A7 IV stops at 60p. The larger sensor does not make up for the missing capture rate. a6700’s faster mode adds crop and disables internal 120p proxies, so a wider lens, suitable card and computer-side proxy step may enter the plan. A7 IV can still be the stronger purchase for full-frame stills and ordinary-speed video with suitable lenses. Decide from the finished clip and editing routine, rather than assuming the larger body is the next step for every hybrid shooter.
How we reached this conclusion
Explicit video inventories and a6700 proxy/card limitations. No measured sport autofocus or slow-motion quality ranking.
The lens can keep the full-frame camera in the old frame
An E-mount label tells you a compatible lens can attach, not that it covers the whole full-frame sensor. An APS-C lens on A7 IV needs the cropped area, or can show dark corners if crop is disabled. If your compact lens collection was chosen for outings, moving it across may preserve the old field of view while giving you a larger body. a6700 keeps those lenses in their intended system. A7 IV is more compelling when a suitable full-frame lens supplies the wider indoor view you wanted. Include that lens in the purchase before comparing camera bodies alone.
How we reached this conclusion
Sony APS-C/Super 35 manual and common E mount. No invented full-frame crop pixel count or guarantee for third-party lens behavior.
A heavier camera may still be worthwhile if it replaces awkward connections
A7 IV adds 165g with battery and card before either lens is counted. For a family bag, that is an incomplete weight comparison until the lenses and any monitor are included. Its full-size HDMI and two SD-capable slots may nevertheless suit a setup used at home as well as outdoors. a6700 keeps the body smaller but has one card slot. Compare the complete arrangement you connect, carry and copy files from. Do not buy the larger body solely for more sockets, or reject it solely on body weight, when one specific connection could remove an adapter or make the setup easier to use.
How we reached this conclusion
658-493=165g on comparable weight basis. Connector and card inventories. Conditional workflow inference without unverified adapter compatibility or backup-mode claims.
Choice A
Sony, ILCE6700/B
Sony a6700 body
Your compatible APS-C E lenses already cover outings, and a smaller body is useful before adding the lens.
- Best matched use
- Your compatible APS-C E lenses already cover outings, and a smaller body is useful before adding the lens.
Checked facts
- Internal 4K slow motion: Up to 119.88p with extra crop
- Full-frame lens indoors: APS-C framing
- Retained APS-C lens: Native intended sensor coverage
- Body with battery/card: 493g
Choice B
Sony, ILCE7M4/BQ
Sony Alpha 7 IV body
You own suitable full-frame lenses and want their wider stills or ordinary-speed video coverage in a room.
- Best matched use
- You own suitable full-frame lenses and want their wider stills or ordinary-speed video coverage in a room.
Checked facts
- Internal 4K slow motion: Up to 59.94p in Super 35
- Full-frame lens indoors: Full-frame coverage in supported modes
- Retained APS-C lens: Needs cropped area or may show dark corners
- Body with battery/card: 658g
Meaningful differences
What changes the fit
| What changes | Sony a6700 body | Sony Alpha 7 IV body | Why it matters |
|---|---|---|---|
| Internal 4K slow motion | Up to 119.88p with extra crop | Up to 59.94p in Super 35 | The smaller-sensor model supports the faster 4K capture mode. |
| Full-frame lens indoors | APS-C framing | Full-frame coverage in supported modes | A7 IV can show more of the room, but not at every video setting. |
| Retained APS-C lens | Native intended sensor coverage | Needs cropped area or may show dark corners | Physical E-mount compatibility is not the same as full-frame coverage. |
| Body with battery/card | 493g | 658g | A7 IV adds 165g before the lens is counted. |
| Slots and HDMI | One SD slot | Two SD-capable slots and full-size HDMI | Supporting equipment and exact recording needs should decide whether these additions matter. |
What you give up
Every choice has a cost
If you choose Sony a6700 body
- A high-speed video card, wider lens or computer-generated proxies may be needed for the intended output.
If you choose Sony Alpha 7 IV body
- The body adds 165g before lenses. Full-frame lens purchases can change both the cost and carry weight.
Recommendation switch
The decision flips if...
APS-C lenses and 4K120 are the recurring needs
Choose Sony a6700 body. a6700 keeps those priorities together.
Full-frame lenses and wider ordinary-speed coverage matter more
Choose Sony Alpha 7 IV body. A7 IV serves that setup, with cropped 4K60 understood.
What matters in practice
Before you choose
You want full-frame room coverage without losing a useful slow-motion mode or replacing the lenses that made the small camera easy to carry.
What this comparison cannot tell you
- No measured image-quality or autofocus winner.
- Physical handling should be tried with the actual lens.
What the facts say
What the comparison shows
Useful conclusions from the current mirrorless cameras comparison, followed by the checked facts used to reach them.
See the checked facts and calculation notes
| Product | Needs matched | Checked facts | Source records |
|---|---|---|---|
| Sony a6700 body |
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| Sony Alpha 7 IV body |
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Ready to choose?
Check the price. Read the owner reviews.
Open either model on Amazon to check the current price, customer reviews and delivery options.
Sony a6700 body
Your compatible APS-C E lenses already cover outings, and a smaller body is useful before adding the lens.
You need internal 4K120 and accept the extra crop, mode-specific card requirements and lack of internal 120p proxies.
See price & reviews on AmazonSony Alpha 7 IV body
You own suitable full-frame lenses and want their wider stills or ordinary-speed video coverage in a room.
Two SD-capable slots and full-size HDMI fit your recording or transfer setup, with the actual recording mode checked.
See price & reviews on AmazonLinks open in a new tab.