18-35 translates to somewhere between 13 and 14mm.EF is much cheaper, easier to manual focus on majority of lenses. The overall build quality is also better adapters make things loose. M43 would yield a faster workflow for some, since the lenses are smaller, and you can use tap to focus (sadly, AF-C is not to be relied on on GH5, but maybe the EM1.2's new AF-C might be something you're interested down the line). When paired with the GH5S it's a great compact, OIS zoom lens that can easily travel, gimbal mount, use CAF, and is splash, dust and freeze proof, and $450-500 used. I had one for a while with a Viltrox but sold it because I just used my 12-35mm f2.8 waaaay more. I wouldn't trust auto focus with adapted lenses at all if that was a thing you wanted. If it's handheld or tripod mounted it doesn't have too many drawbacks. The Sigma is a good setup for the money, but a bit bulky and heavy for gimbal use if that's a consideration. I'll wait for a grey market or used option to become available and give it a shot then. I'm interested in the lens but I refuse to spend that kind of money. If you put an f1.X lens on a GH5S wide open you have virtual night vision.Īs for those two lenses I won't be buying a 10-17 new. If you put an f1.X lens on a GH5 wide open you start to be able to shoot in low light. Plenty of times people balk at the idea of a different camera body because of the cost, but if you're considering buying a 10-17 f1.7 then you have the money to entertain getting a GH5S instead. It doesn't deprive you of the choice of shooting wide open or with super fast lenses, but it no longer REQUIRES it. The GH5S can shoot at F0 ISO and look brighter and cleaner than a GH5 with an F1.2 lens at 3200 ISO. You also lose those nice wide angle lens flares if you wanted them. There's also the image sharpness that takes a dive shooting wide open all the time, and then just the stylistic drawback of never being able to keep a subject completely in focus unless you're a good distance from them (which isn't always possible). Combine those two and focusing at night manually is made much harder, and using CAF or SAF is next to impossible. The whole f1.X aperture for low light has some real drawbacks: that the DOF is ALWAYS razor thin, the GH5's contrast detect AF struggles already in low contrast situations like night shooting. My thinking and I say this over and over again on here is if low light is a major concern just get a GH5S and don't try and bandaid it with a lens. Thank you for your time - if anything is unclear feel free to ask any further questions. If it's any help, other lenses I own: Olympus 40-150 f2.8, Panasonic 42.5 f1.7 and Panasonic 25mm f1.7. The conversion math between different systems still confuses me quite a bit so my other question is this - is the sigma 18-35 wide enough on the GH5 to be classified as a "wide angle" lens? Would you recommend I a) Get the panasonic 10-25 or b) Get the 18-35 with a 0.71x speedbooster to help in those low light shots. Not to mention the low light benefits of this combo. However, I am interested in the whole speedbooster (0.71x) with the Sigma art line so i'm not limited to MFT in the future. I currently do not own a wide angle lens so I feel like the 10-25 could be a good fit here for this void (wanting to get into more landscape photos and video) So naturally when the announcement for the 10-25 came out it caught my interest. I currently run my GH5 with the panasonic 12-35 f2.8 but feel a bit limited sometimes in low light situations.
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