GH5 17-55mm vignetting with GH5s

C

coutard

Well-known member
Hi!

Just received my brand New gh5s
Pretty happy so far, especially with low light which looks very good, and I'm step by step trying to know it better since I was into C100s until now

Therefore I own mostly canon glass (18-35 sigma, 17-55, 24-105) and bought a metabones ultra

I was very happy with the equivalent I would get with the 17-55 (eq.24-75/2!) but I'm surprised it vignettes a lot, even at 20mm

Anybody experienced that ? What would you recommend to get this kind of equivalent ? I'd rather get another EF glass and not remove the metabones too often since I'll screw it into the cage, and I love to have that extra stop

Thanks !
 
Do you have the same vignetting problem with the Sigma 18-35?

The 17-55 seems a bit redundant in your set. Guessing it's the lens i.s. that makes you want to keep it? Because you have a faster lens with the 18-35, but no i.s. and less range, but if your 24-105 has i.s., it's just slower (assuming it's f/4).

I don't know what other options you'd have. A Metabones non-Speedbooster adapter to allow you to use the 17-55 but no gains in wide angle / aperture? Use the GH5s in a cropped mode? Post correction of the vignette?
 
this is likely due to the wider sensor of the GH5s. I don't have one, but, I don't think the GH5 + metabones ultra .71x vignettes on the 17-55?

The GH5s has a wider FOV. I don't have mine yet, but, can you try switching your frame size away from Cinema 4K or 2K? Not sure if this will help but I believe from what I read it might use less width in the sensor.
 
Thanks for your answers.
Well, first I only shoot in HD.
The sigma is not redundant in my opinion because I mostly do quick and fast documentary, therefore I often can't swap lenses that much, and the range of the sigma being short, I use it rarely on low light interiors tripod shots.
I used 17-55/2,8 a lot in interiors and 24-105/4 in outdoor shots. As you guessed, I do a lot of handheld so need the IS.

I'm starting to think I shouldn't have bought the metabones but sell my canon glass and invest in Panasonic lenses, since that extra stop is not that relevant with the sensitivity of the gh5s...
 
Yeah, the Metabones is never a perfect solution. It offers a lot of great things, and opens up your world to many, many options.

What if you sold your 17-55 and got the Panasonic 12-35 f/2.8? That's an equivalent 24-70, so it's close to the 17-55, and it has optical stabilization. And you get to have the option of EF mount lenses too.
 
much of the available m43 glass requires distortion correction, this happens via the electronic contacts with the body. This results in softness. To compensate, as part of the process, electronic sharpening is applied. This all happens outside of user control and before you can adjust any sharpness settings. It has been tested by taping over the contacts on the lenses and comparing the softer slightly more distorted images. Many prefer the look, and this plays part on the GH series video look.

To bypass, try manual glass (ie SLR magic, voigtlander) or adapted glass (vintage, or modern).

Many people are happy with the Leica glass. I own some. YMMV. Just be aware. I find I tend to prefer the non native glass or native manual glass.
 
Didn't know either ! Thanks, I'll look into it
Pana 12-35 instead of 17-55 still looks like a good solution though
 
filmguy123 said:
You get forced electronic sharpening with native glass
Click to expand...

The OP is doing mostly handheld "quick and fast documentary". The convenience of native glass wins over any minor PQ difference. If he wants, he can degrade the image slightly (a minimal blur filter is quick and easy) in post to look more like manual glass.
 
joe12south said:
The OP is doing mostly handheld "quick and fast documentary". The convenience of native glass wins over any minor PQ difference. If he wants, he can degrade the image slightly (a minimal blur filter is quick and easy) in post to look more like manual glass.
Click to expand...

This is a fair statement! FWIW, I also do handheld quick and fast for many shoots, and the image quality change to my eye personally is large enough that I shoot mostly manual and sometimes adapted for quick & fast documentary. But that's just me, YMMV. The 12-35 (or a 12-60) is hugely valuable to have in the tool kit.
 
I'll have to test it to really see the difference.
Using primes is really not an option for me...

A New metabones ? That would happen ? Sensor is not the same size between gh5 and gh5s ?
 
As the vast majority of shooters are interested in getting closer to a full frame FOV, not further from it, I seems unlikely Metabones is interested in making a focal reducer that has *less* reduction.
 
I noticed my Tokina 11-16mm now vignettes at 11mm with speed booster ultra on the GH5S, but at 12mm it is gone so not a big deal.
 
The GH5S sensor is wider than the GH5, so Ultra Speed Booster with 0.64x focal reducer is going to vignette with APS/C lenses, with less than 33mm projected image circle, which most wide angles zooms for APS/C lenses will not do, so they vignette at the wide side. You need to use the Ultra speed Booster with 0.71 focal reducer which only needs a 30mm projected image circle, and should work with most APS/C wide angle lenses and zooms. With Full Frame 135 lenses, it should not be an issue.
Cheers
 
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