Panasonic S5 AF w/ Sigma 28-70 f2.8

Started Jun 1, 2021 | Questions
tom_0123 New Member • Posts: 8
Panasonic S5 AF w/ Sigma 28-70 f2.8

I am Currently on The Market For A Full Frame Travel/Family Camera To Upgrade My G85 (I am Not A professional), I was thinking between The A7c Or S5 w/ Sigma 28-70 f2.8, but there aren’t many reviews of that lens on l mount, so does anybody know How Good The AF Is with The S5, I am OK with the AF Performance Of The G85, But As Far As i Know Sigma Lenses Dont Use DFD Data, So Is The Autofocus Usable For Family Or Travel? Is it better than the G85 or should i just go with the A7c?

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Panasonic G85 Panasonic Lumix DC-S5 Sigma 28-70mm F2.8 DG DN
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Strangefinder
Strangefinder Senior Member • Posts: 1,325
Re: Panasonic S5 AF w/ Sigma 28-70 f2.8

tom_0123 wrote:

I am Currently on The Market For A Full Frame Travel/Family Camera To Upgrade My G85 (I am Not A professional), I was thinking between The A7c Or S5 w/ Sigma 28-70 f2.8, but there aren’t many reviews of that lens on l mount, so does anybody know How Good The AF Is with The S5, I am OK with the AF Performance Of The G85, But As Far As i Know Sigma Lenses Dont Use DFD Data, So Is The Autofocus Usable For Family Or Travel? Is it better than the G85 or should i just go with the A7c?

The lens was delayed, but hopefully we’ll hear more user reports soon.

The Lumix director indicated that Sigma lenses would be DFD profiled to some extent, though the impact upon AF is unclear. Sigma participates in updates to the L-mount protocols so you could expect better compatibility between Sigma and Panasonic than between Sigma and Sony (especially over time).  There may be a slight advantage to using the same brand (i.e. Sigma fp or fp L) though camera/lens firmware releases should get them up to speed sooner or later.

The S5 would certainly exceed the G85 AF.

This suggests that it should be fast:

"The new lens features just one lightweight focusing element, which keeps the AF unit small. This, along with a quiet and fast stepping motor, makes for responsive and near-silent autofocus performance."

Though, the lens’ first priority is being compact, so it won’t necessarily match the AF performance of S PRO or ART/Sports lenses if they’ve made AF a priority.

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rashid7
rashid7 Veteran Member • Posts: 6,969
Re: Panasonic S5 AF w/ Sigma 28-70 f2.8

tom_0123 wrote:

I am Currently on The Market For A Full Frame Travel/Family Camera To Upgrade My G85 (I am Not A professional), I was thinking between The A7c Or S5 w/ Sigma 28-70 f2.8, but there aren’t many reviews of that lens on l mount, so does anybody know How Good The AF Is with The S5, I am OK with the AF Performance Of The G85, But As Far As i Know Sigma Lenses Dont Use DFD Data, So Is The Autofocus Usable For Family Or Travel? Is it better than the G85 or should i just go with the A7c?

gotta decide what's most important to you, size or ergonomics?

Easy choice for me; i could not live w/ the A7C's evf and lack of index finger dial

(even the totally superior A7riii doesn't match the ergo/UI of S5)

Obviously the sony lens lineup trumps L-mount, but Sigma is really coming through for panasonic.  I own sigma 14-24, 35&65f2, and 100-400 - all designed for mirrorless, and all excellent (IQ, AF, size and value).  What more could we ask for?!

I will probably buy the 105 DG DN Art, and will definitely look closely at the 28-70.  Don't miss out on the kit 20-60, although it overlaps the 28-70!

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OP tom_0123 New Member • Posts: 8
Re: Panasonic S5 AF w/ Sigma 28-70 f2.8

That’s The Problem With Sony, Although They Make Great Camera’s, It Just Doesn't Look Like I Am Gonna Enjoy Using The A7c, I Just Wish That The Panasonic Had Hybrid AF, then it would have been an easy choice for me

(unknown member) Senior Member • Posts: 1,452
Re: Panasonic S5 AF w/ Sigma 28-70 f2.8

Look at G9 and 12-60 Leica. Amazing and you can keep your lenses.

John Vickers Contributing Member • Posts: 798
Yes, Sigma lenses do DfD. Panasonic says so.

tom_0123 wrote:

I am Currently on The Market For A Full Frame Travel/Family Camera To Upgrade My G85 (I am Not A professional), I was thinking between The A7c Or S5 w/ Sigma 28-70 f2.8, but there aren’t many reviews of that lens on l mount, so does anybody know How Good The AF Is with The S5, I am OK with the AF Performance Of The G85,

But As Far As i Know Sigma Lenses Dont Use DFD Data,

Sigma L-mount lenses do use DfD. At least according to Panasonic: https://youtu.be/A16wEucBv8M?t=618

The important question isn't whether Sigma lenses do DfD, but whether the focus performance is OK.

This could be put the other way round: I have some Sigma lenses. What recorder(s) can I stick on the back of my Sigma lenses which will focus OK? Sigma lenses can focus very well.

AF on Sigma 24-70 DG DN works for me at least as well as Panasonic kit lenses. That would be my favourite lens.

So Is The Autofocus Usable For Family Or Travel? Is it better than the G85 or should i just go with the A7c?

I don't know MFT, but I suspect that if you are used to G85, you would find the S5 similar but better: the S5 autofocus is an evolution of G85 autofocus.

I find Panasonic AF mostly works quite well, but can fall flat on its face at times: it can completely fail to lock on to targets which are easy for a - more than decade old - DSLR, let alone a recent DSLR. More here: S1 AF only sensitive to horizontal contrast (vertical edges) ?

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