VILTROX EF-M2 II 0.71x Speed Booster Adapter MFT for EF mount Lens to Micro 4/3 Cameras GH6 GH5M2 BMPCC 4K GH4 GH5 G100 G95 G85 OM-1 EM-10 EM-5

Fitted to my GH5 and Sigma art lenses, superb results and a fraction of the cost of the Metabones, easily as good.

Used on a Panasonic G9 and sigma 18-35 1.8. Cons - There's slight vignetting (might be the lens) and is mitigated by stopping down to around 2.8 and initially the lens couldn't reach infinity focus, but that was easily fixed by rotating the element clockwise until it worked properly. Pros - Image quality seems nice and sharp and the extra stop of light is noticeable when compared to not using a speedbooster. IBIS, AF and aperture all work through the camera, although AF doesn't work well continuously for photos and a bit too noisy for video. Definitely worth it over metabones if you value money

Product arrived fast and well packed. Satisfied with the product and overall quality of it. Well built, suits my Gh5 perfectly.

After a bit of fiddling with the lens facing glass as per online instructions, I've now got this taking some wonderful images (see above, taken at f4 on my Sigma 18-35 1.8 lens paired with a GH4). It's perhaps not quite as sharp as using a decent native lens. However I intend to use it for video, so it's more than good enough for that. It seems well made - it fits the camera/lens snuggly. Autofocus isn't perfect, but it's actually better than I thought it would be.

Creates Softer focus and has problems with infinity focus even when adjusting the ring. Software has problems with adjusting aperture even when downgrading to 2.3 V and so it suffers from glitches. It tends to work better with sharp lenses when it works properly with the internal aperture

Mechanically the adapter is OK, but the auto-focus does not function. When I purchased, it was not clear this was an issue, although now there is a warning - but it is easy to miss on the web-site. I would like to return it but left it too late. Depending on your needs it is easier and probably more cost effective to buy a new lens.

I’ve had this thing for ages now as I couldn’t afford the metabones version. Works perfectly, footage still looks really good. Id buy it again if I broke it for sure.

UPDATE: The new item arrived and worked straight away without any problem. First unit must have been faulty. Still great build quality and price. I’ve upped my rating from 2 to 4 stars. Possibly 5 stars once I’ve used it some more. Original review: I wanted to like this product SO much but it didn’t work right out of the box. I was using a listed lens, the Canon 70-200mm f4 but from power on with the GH5, I received the “Lens attachment Failed” warning. (Adapter firmware up to date) The build quality looks great and the price is reasonable but that doesn’t really matter if the product doesn’t work! I’m ordering a replacement to see if it was a faulty unit. I’ll update this review accordingly depending on how the replacement works out.

I was definitely impressed! I tested it on GH5 using the following lenses: 16-35mm Mk III, 24-70mm Mk II, 35 Mk II 1.4, 50 1.8 and 24-105mm Mk I and they all worked surprisedly well! My co-workers who are also professional video producers were also very impressed! That extra full stop of light is going to really come in handy in low light settings! Awesome value for the money! I plan to buy another for my B cam. Definitely recommend it!

Le VILTROX EF-M2 II Speedbooster 0.71x est un accessoire essentiel pour les photographes et vidéographes utilisant des objectifs EF monture sur des appareils Micro 4/3. Cette bague adaptateur offre une réduction de la focale de 0,71x, ce qui signifie qu'elle permet de capturer des images plus lumineuses avec un champ de vision élargi. Ce dispositif est un excellent choix pour ceux qui veulent maximiser la performance de leurs objectifs EF sur des caméras Micro 4/3. Il permet de conserver la qualité d'image tout en réduisant la perte de lumière, ce qui est particulièrement utile dans des conditions de faible luminosité. Le VILTROX EF-M2 II Speedbooster offre une solution fiable pour l'adaptation des objectifs EF, ce qui en fait un ajout précieux à l'équipement de tout photographe ou vidéographe travaillant avec ces deux montures.

Questo è il secondo VILTROX EF-M2II che acquisto. Uno lo utilizzo con la cinecamera Z CAM E2 e questo con la Panasonic Lumix GH5. Conscio del fatto che un Metabones sia otticamente superiore a mio parere credo che la differenza di prezzo (circa 4:1) non sia giustificata. Riguardo la differenza della qualità finale dell'immagine preferisco utilizzare il Viltrox del quale va sottolineato che oggi viene venduto nella sua seconda versione (M2 II) che differisce dalla prima versione (M2). Il fattore di moltiplicazione dichiarato (0.71) è leggermente superiore a quello reale (circa 0.7) perchè il campo inquadrato è leggermente più ampio del metabones (ho avuto modo di fare delle prove sfruttando l'amicizia con alcuni amici videomakers). Su questo item non'ho riscontrato problemi di messa a fuoco all'infinito (fortunato) ma in caso basta ruotare con le dita (con attenzione e delicatezza) il sistema ottico centrale che è semplicemente avvitato e non'ha viti di blocco (operazione che richiede tempo ma i risultati sono garantiti). Ve lo dico perchè sul primo Viltrox ho dovuto agire in tal senso. Meccanicamente solido, otticamente un pelo meno definito del metabones ma comunque più che accettabile, anzi in abbinamento a macchine che restituiscono un immagine contrastata e dettagliata quel tocco di leggero "sfumato" dona alla scena una sensazione più "cinematografica". Ho trovato installato il penultimo firmware (Ver. 3.3) che era anche l'ultimo fino a pochi giorni fà e l'ho aggiornato alla versione 3.4. In abbinamento alla GH5 tutto sembra funzionare bene con le ottiche in mio possesso (TAMRON, SIGMA e Canon). Il costo non'è elevato se rapportato a quello del metabones e nel mio caso il funzionamento è sufficiente a rendermi soddisfatto dell'acquisto. La gestione dell'AF potrebbe essere più veloce e precisa ma a parte questo non vedo grossi difetti e/o problemi. Anche il serraggio delle baionette è buono e non mostra gioco meccanico e nemmeno un serraggio "esagerato". Non consiglio e non sconsiglio questo prodotto perchè tutto dipende dalle Vostre esigenze ed aspettative. Se volete la qualità assoluta dirigetevi sul metabones ma spenderete più di ottocento euro ... altrimenti prendete questo a circa quattro volte di meno senza aspettarsi perfomance ottiche di "riferimento" anche se per me sono più che decorose.

This speedbooster is amazing , everything is crystal clear , While paired with canon 50mm f1.8 lens the autofocus working amazingly in lumix g85 , The ibis is working and the main advantage is the f1.8 come down to f1.3 , No need of premium metabones i am satisfied with the viltrox premium videos and pictures, autofocus in video is not that great , and i always prefer manual so that is not a problem for me

works great, tested on canon 24-105 f4 and 50 f1.4. works great. needed the infinity focus adjustment and nothing else. working on gx-850. seller is awesome when asked question. replied withing 24 or less. only downside is they need to update the compatibility list and get more lens on it.