[fernandoj]

Which zoom do you think is the best, of all sensor sizes, in the range between 24 and 100 / 120mm (reference ff)?  Thanks and greetings from Spain

[thxbb12]

Olympus 12-100 f4 for micro 4/3 (equivalent to 24-200 fullframe)

[Brightcolours]

Olympus 12-100 f4 for micro 4/3 (equivalent to 24-200 fullframe)

The Canon RF 24-105mm f4 L IS USM, for instance, is better and somewhat cheaper.

[thxbb12]

Olympus 12-100 f4 for micro 4/3 (equivalent to 24-200 fullframe)

The Canon RF 24-105mm f4 L IS USM, for instance, is better and somewhat cheaper.

It depends on the OP's priorities. If the OP values focal ranges > 105mm then the 12-100 is better :-)

[fernandoj]

Preferences are: lightweight, mirrorless system. Thanks for your opinions.

[thxbb12]

Preferences are: lightweight, mirrorless system.  Thanks for your opinions.

If you value lightweight (and presumably size as well) then micro 4/3 makes probably more sense than any other mirrorless system.
I'd recommend a Panasonic GX9 body as it can be had for nothing these days while still providing excellent IQ in a lightweight and small package.
Here are some options shown in the image below:



From left to right (prices in Swiss francs from http://toppreise.ch):

• Canon RP + Canon RF 24-105 f4. Weight: 1185g (485+700). Cost 2088 CHF (1080+1008)
  
• Panasonic GX9 + Olympus 12-100 f4 (FF equivalent 24-200). Weight: 968g (407+561). Cost 1482 CHF (500+982)
  
• Panasonic GX9 + Panasonic 12-60 f2.8-4 (FF equivalent 24-120). Weight: 727g (407+320). Cost 1246 CHF (500+746)
  
• Panasonic GX9 + Panasonic 12-60 f3.5-5.6 (FF equivalent 24-120). Weight: 617g (407+210). Cost 875 CHF (500+375)
  
• Panasonic GX9 + Panasonic 12-32 f3.5-5.6 (FF equivalent 24-64). Weight: 477g (407+70). Cost 500 CHF
  

Depending on your needs you can go from super tiny/light to heavier/larger while being very versatile.
A good compromise is probably the GX9 + Panasonic 12-60 f2.8-4.

[Klaus]

I wouldn't put an Oly lens with IS on a Panasonic body - that's a waste of IS potential.

I'd vote for:
- Oly E-M5 III w/ Olympus 12-100mm f/4 IS
- Panasonic S5 w/ Panasonic 24-105mm f/4 IS
- Canon EOS R6 (or maybe R) w/ Canon 24-105mm f/4 IS - I wouldn't go for the RP really due to the shitty sensor.
- Sony A7 III w/ Sony 24-105mm f/4 OSS

From there on it's a matter of use case and preference.

I'm not sure about the G9/GX9 - if I had to guess I'd say that Pana is going to focus on L-mount with the possible exception of the GH6.

[thxbb12]

I wouldn't put an Oly lens with IS on a Panasonic body - that's a waste of IS potential.

I'd vote for:
- Oly E-M5 III w/ Olympus 12-100mm f/4 IS
- Panasonic S5 w/ Panasonic 24-105mm f/4 IS
- Canon EOS R6 (or maybe R) w/ Canon 24-105mm f/4 IS - I wouldn't go for the RP really due to the shitty sensor.
- Sony A7 III w/ Sony 24-105mm f/4 OSS

From there on it's a matter of use case and preference.

I'm not sure about the G9/GX9 - if I had to guess I'd say that Pana is going to focus on L-mount with the possible exception of the GH6.

I've had a GX9 + Oly 12-100 f4 and the stabilization was still amazing (now I'm fully Fuji, but I kept a tiny GM5 + 2 tiny lenses for when I need something super-compact).

I forgot about the E-M5 III. It's true that it's a better camera than the GX9, I had forgotten about it. However, it's quite a bit more expensive.

Regarding the other suggestions, they don't qualify IMO: the OP's priority is weight, therefore any FF system won't be able to compete against MFT zooms at equivalent focal ranges.

[Brightcolours]

If the OP for whatever reason realises that FF equivalent f8 DOF won't always cut it, the other suggestions do start to matter.

[fernandoj]

I wouldn't put an Oly lens with IS on a Panasonic body - that's a waste of IS potential.

I'd vote for:
- Oly E-M5 III w/ Olympus 12-100mm f/4 IS
- Panasonic S5 w/ Panasonic 24-105mm f/4 IS
- Canon EOS R6 (or maybe R) w/ Canon 24-105mm f/4 IS - I wouldn't go for the RP really due to the shitty sensor.
- Sony A7 III w/ Sony 24-105mm f/4 OSS

From there on it's a matter of use case and preference.

I'm not sure about the G9/GX9 - if I had to guess I'd say that Pana is going to focus on L-mount with the possible exception of the GH6.

I've had a GX9 + Oly 12-100 f4 and the stabilization was still amazing (now I'm fully Fuji, but I kept a tiny GM5 + 2 tiny lenses for when I need something super-compact).

I forgot about the E-M5 III. It's true that it's a better camera than the GX9, I had forgotten about it. However, it's quite a bit more expensive.

Regarding the other suggestions, they don't qualify IMO: the OP's priority is weight, therefore any FF system won't be able to compete against MFT zooms at equivalent focal ranges.

What is your Fujifilm photographic equipment?