The catch
Sony a6700 body
It has one SD slot. 4K120 narrows the framing and turns off internal proxies at 120p/100p.
Side by side
Sony a6700 vs Alpha 7 IV: a6700 retains 4K120 and crop glass, while A7 IV opens full-frame lenses
Quick verdict
The a6700 holds on to 4K120 and crop glass, and the A7 IV opens the door to full-frame lenses. The a6700 is the one for 4K120, with its extra crop and media restrictions, or when compatible APS-C lenses already suit the job. The A7 IV is the one for full-frame stills and ordinary-speed video with suitable full-frame lenses. The A7 IV itself uses Super 35 at 4K60. Both offers are body-only, so price the whole lens setup before you call full frame an upgrade.
Before you buy
Why, and what it costs you
For the sports clip you really want, full frame can be a sideways step
If what you produce each week is a slow-motion 4K clip from a child’s game, the a6700 supports up to 120p and the A7 IV stops at 60p. The larger sensor does not make up for the missing capture rate. The a6700’s faster mode adds crop and turns off internal 120p proxies, so a wider lens, a suitable card and a proxy step on the computer may become part of the plan. The 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 your editing routine, and do not assume the larger body is the next step for every hybrid shooter.
Where this comes from
Based on explicit video inventories and the a6700 proxy/card limitations. No measured sport autofocus or slow-motion quality ranking is offered.
The catch
Sony Alpha 7 IV body
4K tops out at 60p, and that frame rate uses Super 35. APS-C lenses do not give automatic full-frame coverage.
Sony a6700 body
- Why pick it
- Your compatible APS-C E lenses already handle your outings, and a smaller body helps before the lens goes on.
- Internal 4K120 is a need, and you accept the extra crop, the card requirements specific to the mode and the absence of internal 120p proxies.
- The catch
- It has one SD slot. 4K120 narrows the framing and turns off internal proxies at 120p/100p.
Sony Alpha 7 IV body
- Why pick it
- You own suitable full-frame lenses and want their wider coverage in a room, for stills or ordinary-speed video.
- Both slots accept SD cards and the HDMI port is full-size, which fits your recording or transfer setup once you have checked the actual recording mode.
- The catch
- 4K tops out at 60p, and that frame rate uses Super 35. APS-C lenses do not give automatic full-frame coverage.
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What this page compares
Sony a6700 vs A7 IV for family sport, indoor groups and E lenses you keep. Look at the 4K frame-rate limits, full-frame coverage and the weight of the whole kit.
For an E-mount owner choosing between the upper APS-C body and an established full-frame model, these are plausible Sony upgrade alternatives. Lens collection and video output can reverse the apparent sensor-size hierarchy.
Which one fits
Pick the situations that sound like you
Shoot internal 4K120 for a slow-motion edit
A7 IV maxes out at 4K60.
- Sony a6700 body
- Better fit
- Sony Alpha 7 IV body
- Not suitable
Stay with a compact set of compatible APS-C lenses
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
Keep body weight low before the lens goes on
a6700 saves 165g on the stated body weight basis.
- Sony a6700 body
- Better fit
- Sony Alpha 7 IV body
- Good
In practice
Differences you will notice
For the sports clip you really want, full frame can be a sideways step
If what you produce each week is a slow-motion 4K clip from a child’s game, the a6700 supports up to 120p and the A7 IV stops at 60p. The larger sensor does not make up for the missing capture rate. The a6700’s faster mode adds crop and turns off internal 120p proxies, so a wider lens, a suitable card and a proxy step on the computer may become part of the plan. The 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 your editing routine, and do not assume the larger body is the next step for every hybrid shooter.
How we worked this out
Based on explicit video inventories and the a6700 proxy/card limitations. No measured sport autofocus or slow-motion quality ranking is offered.
The lens can hold the full-frame camera to the old frame
An E-mount label tells you that a lens can attach. It does not tell you the lens covers the whole full-frame sensor. An APS-C lens on the A7 IV needs the cropped area, and can show dark corners if the crop is disabled. If you picked your compact lens collection for outings, moving it over may keep the old field of view and just give you a larger body. The a6700 keeps those lenses in the system they were made for. The A7 IV is more compelling when a suitable full-frame lens supplies the wider indoor view you wanted. Count that lens in the purchase before you compare camera bodies on their own.
How we worked this out
Based on the Sony APS-C/Super 35 manual and the common E mount. No full-frame crop pixel count is invented and no guarantee is given for third-party lens behavior.
A heavier camera can still be worth it if it takes the place of awkward connections
With battery and card, the A7 IV adds 165g 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 still suit a setup used at home as well as outdoors, while the 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 only for more sockets, or turn it down only because of body weight, when one specific connection could remove an adapter or make the setup easier to use.
How we worked this out
658-493=165g on a comparable weight basis. Connector and card inventories. A conditional workflow inference, with no unverified adapter compatibility or backup-mode claims.
Option A
Sony, ILCE6700/B
Sony a6700 body
Your compatible APS-C E lenses already handle your outings, and a smaller body helps before the lens goes on.
- Best for
- Your compatible APS-C E lenses already handle your outings, and a smaller body helps before the lens goes on.
Facts we checked
- 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
Option B
Sony, ILCE7M4/BQ
Sony Alpha 7 IV body
You own suitable full-frame lenses and want their wider coverage in a room, for stills or ordinary-speed video.
- Best for
- You own suitable full-frame lenses and want their wider coverage in a room, for stills or ordinary-speed video.
Facts we checked
- 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
Spec by spec
Where they really differ
| Spec | Sony a6700 body | Sony Alpha 7 IV body | In practice |
|---|---|---|---|
| Internal 4K slow motion | Up to 119.88p with extra crop | Up to 59.94p in Super 35 | It is the smaller-sensor model that supports the faster 4K capture mode. |
| Full-frame lens indoors | APS-C framing | Full-frame coverage in supported modes | The A7 IV can take in more of the room, though not at every video setting. |
| Retained APS-C lens | Native intended sensor coverage | Needs cropped area or may show dark corners | Fitting the E-mount physically does not amount to full-frame coverage. |
| Body with battery/card | 493g | 658g | Before the lens is counted, the A7 IV is 165g heavier. |
| Slots and HDMI | One SD slot | Two SD-capable slots and full-size HDMI | Whether these additions matter should depend on your supporting equipment and your exact recording needs. |
Trade-offs
What each pick costs you
With Sony a6700 body
- The output you intend may require a high-speed video card, a wider lens or computer-generated proxies.
With Sony Alpha 7 IV body
- The body is 165g heavier before lenses. Buying full-frame lenses can change both the cost and the weight you carry.
Change of plan
When the answer changes
APS-C lenses and 4K120 are the recurring needs
Go with Sony a6700 body. a6700 keeps those priorities together.
Full-frame lenses and wider ordinary-speed coverage matter more
Go with Sony Alpha 7 IV body. A7 IV serves that setup, with cropped 4K60 understood.
Decision guide
Before you buy
You want full-frame coverage of the room, but you do not want to lose a useful slow-motion mode or replace the lenses that made the small camera easy to carry.
What this page can’t tell you
- No winner for image quality or autofocus has been measured.
- Try the physical handling with the lens you will really use.
By the numbers
What the data shows
What we found across the mirrorless cameras we compare, plus the checked facts behind each finding.
Show the facts and the math
| Product | Needs it meets | Facts we checked | Sources |
|---|---|---|---|
| Sony a6700 body |
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| Sony Alpha 7 IV body |
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Ready to buy
See today’s price and what owners say
Open either model on Amazon for the current price, customer reviews and delivery options.
Sony a6700 body
Your compatible APS-C E lenses already handle your outings, and a smaller body helps before the lens goes on.
Internal 4K120 is a need, and you accept the extra crop, the card requirements specific to the mode and the absence of internal 120p proxies.
See price & reviews on AmazonSony Alpha 7 IV body
You own suitable full-frame lenses and want their wider coverage in a room, for stills or ordinary-speed video.
Both slots accept SD cards and the HDMI port is full-size, which fits your recording or transfer setup once you have checked the actual recording mode.
See price & reviews on AmazonEach link opens in a new tab.
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