Which mid-range zoom would you recommend ?

[colonel]

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Weight vs sharpness are playing out for me. The lens will be used with a SL3.

I want a zoom for minority use when I need to have a zoom in good light. Most of the time I use primes.

I prefer a constant f as these tend to be better quality, but could be convinced otherwise. I would like f2.8.

I acknowledge the trade off in zooms.

Basically it seems to be:

1. Leica 24-90mm. Very sharp. A bit on the heavy and large size for what I am looking for.

2. Sigma 24-70mm ii - Very sharp but on the larger and heavier size

3. Panasonic 24-60mm f2.8. Reasonably sharp from f4. Seems like the weight and size are a good compromise

4. Sigma 28-70mm f2.8. Not as sharp as the panasonic but pretty good. Size and weight are the best

I am tending towards the panasonic, but tell me if I have missed a trick (which I always do)

[Ivar B]

Good question. I own the 24-90. A superb lens, but large and heavy.

I needed a compact supplement and ended up with the Sigma 2.8/24-70. Very compact and light weight, in particular if the 24-90 is the point of reference.

I have not used it much but I did some test shots, and it appears to very sharp at all focal lengths from f/5.6 and not bad wide open. 

[la1402]

Sigma 24-70 II.. Not too big and not heavy at all. The 28-70 may be ok but I would miss 24mm and and 70mm with the pana.

Edited 3 hours ago by la1402

[jaapv]

Completely content with the Sigma 28-70. Maybe not APO, but far better than anything on the market 10-15 years ago. And we were happy back then. These are travel and reportage lenses - there is no call for that ultimate 1% There are primes for that. 

[Ivar B]

53 minutes ago, jaapv said:

Completely content with the Sigma 28-70. Maybe not APO, but far better than anything on the market 10-15 years ago. And we were happy back then. These are travel and reportage lenses - there is no call for that ultimate 1% There are primes for that. 

Interesting point. I have also had the impression that lens optical quality certainly has improved over time. I guess that past designs did not need the ultimate performance as the recording medium (film) would not be able to make full use of it any way, but this is different now of course. The APO lenses for the SL system are I believe designed to handle 100 MP. 

[LocalHero1953]

@jonoslack has just published his review of the Leica version of the Sigma 28-70.

He's impressed (and he bought it himself - he wasn't a beta tester).

[colonel]

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1 hour ago, Ivar B said:

Interesting point. I have also had the impression that lens optical quality certainly has improved over time. I guess that past designs did not need the ultimate performance as the recording medium (film) would not be able to make full use of it any way, but this is different now of course. The APO lenses for the SL system are I believe designed to handle 100 MP. 

Zooms today from the major manufacturers are far better then they have ever been. However compared to the latest prime lenses they still have much more distortion (even though corrected in editing tools) and are less sharp. Perhaps there is not as much difference in micro contrast any more due to coatings and aspherical and ED elements.

The question is how much sharp do you need. If you are pixel peeping for critical sharpness then there are only a few zoom lenses, at certain f stops and focals lengths that can compete at 24mp, slightly less at 60mp. But how much does that matter for web or A0 blow ups. Probably nothing. However this is all about weight and size. My favourite zoom lens for the L series at the moment is undoubtedly the Sigma 28-45 f1.8. It is critically sharp and covers the FL range I use the most. However it is just too weighty. So at the moment I need to compromise to use a zoom, or just not use one at all

Edited 1 hour ago by colonel

[Ivar B]

42 minutes ago, LocalHero1953 said:

@jonoslack has just published his review of the Leica version of the Sigma 28-70.

He's impressed (and he bought it himself - he wasn't a beta tester).

I read the review - interesting. Finally one who dares to say that Sigma is involved and identical optical layout.