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7Artisans is one of those Chinese lens manufacturers that have popped up in the last 10 or so years. I played around with 7Artisans on the EOS-M mount, and they were pretty fun bang-for-the-buck lenses, but quirky ergonomics.
7Artisans is known for its manual focus, and manual aperture lenses, and this 9mm F5.6 full-frame lens is no different. However, with 16 elements and 11 groups, it's not exactly a simple lens either.
The craziest thing about this lens? It should cost somewhere around $375 if this specification sheet is correct. What grabbed my attention was the MTF data. If this is actually what this lens can do, it's a pretty good lens. Yes, it's all manual but who needs AF at 9mm anyways? As an example, the widest Canon-made RF lens (Canon RF 14-35mm F4L) falls off more to the corners and has greater astigmatism according to the MTFs – and it's 14mm versus 9mm.
Craig actually has the lens, so hopefully, we'll be updating this post with some real-life examples.
This has the makings of a very interesting lens for the RF Mount.
Specifications
| Lens specifications | |||
|---|---|---|---|
| release date | September 25, 2023 | Initial price | 2790 yuan |
| mount | E/Z/RF/L | Minimum shooting distance | 0.2m |
| format | full size | Maximum shooting magnification | not clear |
| Focal length | 9mm | Filter diameter | incompatible |
| Lens configuration | 16 elements in 11 groups | Image stabilization | – |
| open aperture | F5.6 | Teleconference | – |
| minimum aperture | F22 | coating | not clear |
| aperture blade | 5 sheets | ||
| Size, weight etc. | |||
| size | φ70×86mm | Dustproof and splashproof | incompatible |
| weight | 463g | AF | MF limited |
| others | No electronic contacts/non-fisheye | ||
Elements / MTF
Source: Asobinet.com
Could it be possible that third party RF mount lenses have slightly less quality of the RF mount itself? I mean, could it be possible that due to 'worse' third party tolerances the mount on the camera be 'damaged' because of third party RF mounted lenses? Just wandering about the RF mount (or any mount) tolerances of Canon versus third party fabricated lens mounts.
Please help me getting some sleep over this one 😉
If there is a positive part of only approving certain lenses it would be an indication that those lenses are safe.
I can't imagine this would be of any sort of problem just because it is now an RF mount.
The only real difference I see at this point is, due to Canon's legal team...they're not allowing 3rd parties to interact with the AF system like they were able to with the EF system (and then was reversed engineered).....Canon is wanting to keep the $$ to themselves I think at this point, but at some point it will be opened up to 3rd party.
But just for a mechanical connection between a lens and the camera....that "mount" is pretty much Childs play for any company of a decent sort to handle.
It's not rocket surgery we're talking about here...
HTH,
cayenne
Is there a use case for filters on the 8-15/4? It has a rear filter gel option but I haven't used it. My experience with it (underwater, astro, quirky architecture, one-time big nose portraits) hasn't needed them. CPL should get artifacts if the sky is in it (and rarely wouldn't it be @8mm 🙂)
ND filters for video use maybe?
Usually on lenses the releases are decently sturdy (because lenses are usually somewhat heavy), but I encountered many macro tubes, extenders, etc, with a very lousy bayonet locks; also in RF days, when I first got the R6 I couldn't find a genuine RF to EF adapter, so I got one from Meike, that was as good as the genuine in AF end electronics functionality, but the lock was yes sturdy but not UBER sturdy...so as soon as I got ahold of a Canon one, I sent the Meike back to Amazon.
So I'm very third party open, and always happy to save money, but there are some things, like adapters, where I prefer to buy original stuff, because I wouldn't entirely trust to affix for example my 1.3kg 70-200 (and my 40 Art weights almost the same, but has no tripod ring to swap lock point) to a chinese accessory, and let it dangle from my strap for hours during a wedding; another things where I never save are tripod plates, or camera straps that connect to the quarter inch thread on the bottom of the camera. Any thing that may affect stability of the camera and/or prevent the camera to detach/fall/move, is something you should never ever save on.