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Avis (56)
22 févr. 2017
Beware of empty magnification
There are relatively few DSLR lenses capable of more resolution than can be obtained by attachment to a 50 megapixel APS or 22 megapixel APS-C DSLR, and most of those that can are expensive primes. Meanwhile, a teleconverter will display objects larger in viewfinders, perhaps helping get autofocus and autoexposure points on subjects. Autofocus will probably be noticeably slower with than without teleconverters.
Kenko's Pro 300 DGX is considered by many users to be optically indistinguishable from Canon's,
but some feel that its mechanical tolerances are looser.
I have not found that to be the case. Inserting even Canon's teleconverter between lens and body increases tolerance build-up, and I have seen as much tolerance variation among Canon lenses and bodies as among teleconverters.
A unique advantage of Kenko's is that it will fool some Canon bodies to focus at f/8 (f/5.6 lens + 1.4x teleconverter = f/8) when Canon's teleconverter will not. This Kenko also works with Canon's non-L 70-300mm zoom, where Canon's 1.4x simple cannot fit mechanically. That 70-300mm zoom lacks resolution to make adding 1.4x yield more detail, though.
12 déc. 2019
Thin is good
Thicker cables with braided jackets may seem more durable, but my experience has been that
most USB cables not misplaced are replaced because of failures at connectors,
which may be aggravated by additional stresses from stiffer cables.
Another advantage of thinner cables is ability to wrap more turns in ferrite EMI beads,
where EMI (ElectroMagnetic Interference) attenuation improves in theory
by the square of turn count, making 4 turns roughly 16 times more effective than one.
EMI can be problematic at higher frequencies employed by USB type C.
06 juin 2018
Not ready for prime time.
2 personnes sur 26 ont jugé cet avis utile. Samsung Odyssey is state of the art for stereoscopic headsets today (May 2018), but still pretty crude.
While it is considered the best among headsets currently available, expect it to be obsolete in 2 years.
It has adjustment for pupillary distance but not diopter, and both are wanted for good stereo vision.
The headset is uncomfortable, heavy, and its USB+HDMI cable for audio and video is cumbersome.
I find the hand controls so clumsy as to be nearly useless, but are reportedly less uncomfortable
than those bundled with other Windows Mixed Reality (WMR) headsets.
Software betrays gaming heritage, meaning deliberately making operation unobvious.
Relatively little software is plug-and-play; most desirable software requires SteamVR,
which requires yet other software and more or less successfully mentally translating instructions designed for other hardware (Vive and Oculus Rift) to WMR controls.
Software requires a recent PC costing ~ $1500. Visual space between pixels (AKA "screen door effect") is hard to ignore, but again considered the best currently available in consumer grade headsets.