Meike EFTR-0.71X Lens Mount Adapter Speed Booster 0.71x Focal Reduction Lens Mount Converter Speedbooster for Canon EF Mount Lenses to Canon APS-C Cameras EOS R10

Pra quem precisa de um campo de visão maior, ela atende bem. Na fotografia não há o que reclamar. Apesar do erro que sempre vai aparecer ao ligar a camera, ela funciona bem. O problema vem quando você precisa usar o estabilizador IBS ( direto do sensor ), na minha R7 usando uma 24-70mm f2.8, abaixo de 35mm o estabilizador fica perdido sem conseguir estabilizar.

I was originally going to buy the metabones adapter but this was flagged to me so i thought id try it on y Canon R7. Positives. The RF side locks in really well to the body. The weather seal on the RF side fits nicely. The control wheel on the side works well and can be allocated a custom function. The image quality with the speed booster on is largely unaffected , if pixel peaking one can see some very slight image fuziness in the corners of some images but then again its showing more of the actual lens image footprint on the sensor that one wouldnt usually see on an APS-C crop sensor so the tiny amount of softness could be the lens itself you just never see it on a crop sensor.. Works pretty well on most lenses but see the not so good comments below Great price compared to metabones Allows an extra stop of light Not so good When using some zoom lenses that arent equipped with IS the built in IBIS of the camera jumps at certain zoomed focal lengths when zooming through. . In my case this happens to my Canon EF 2.8 24-70 L when zooming passed 20-21mm ( as reported in camera by the speedbooster not on the actual lens focal length ) and my Canon 2.8 70-200M L zooming passed 69mm( again, as reported in camera by the speedbooster not on the actual lens focal length ) . The IBIS stutters at that point as i dont think the camera can work out whats going on as the reported focal length isnt the true focal length of the lens and at that point in the zoomed focal length compared to the true focal length a brain fart and the IBIS over reacts . The way around this is to set IBIS from always on to 'one shot ' so IBIS only cuts in just before taking a photo and not when zooming the lens .Although in video mode you cant do this as IBIS runs all the time so you need to avoid shooting video and zooming while filming when using the lenses which is a pain. Edit, I’ve found the stutter was due to ibis turning on , when the lens is wider than the actual focal length the camera turns Ibis off as the adaptor isnt providing the body with the correct focal length information. I have reported this to Mieke but they didn’t seem overly bothered to investigate and have never updated the firmware so I don’t use the adaptor anymore as of 2026 and it sits in a drawer . The finish on the adapter is glossy meaning it catches the light which isnt great if using for nature, i wish it was satin. The EF side of the mount whilst secure still suffers from the EF mount wriggle albeit very slight and no worse than Canons own system. The EF side hasnt been designed for the EF weather resistant gasket in mind so the lens gasket rides over the edges of the face of the adaper and provides no sealing what so ever, odd as the RF side is designed nicely and seals well against the body on that side of the adaptor. The warning that the accessory isnt designed for the camera every time you turn the camera on which you have to accept to use the adapter , to be fair you have to do this with the Canon speedbooster offering so its more of a camera thing that the speedbooster itself The instructions are poor, they provide gaskets to adjust infinity focus but the 'how to' is brief and doesnt really give enough info to attempt it yourself. Basically i wouldnt even mess with that unless you use manual focus and need to use the lens window to work out the focus distance. I contacted their tech support to ask if there was a fix for the IBIS issue , they just responded with 'try this please' and sent a basic firmware file but no instructions regarding how to install or installer file it so im no better off . So id say its a good product that could be better supported and could do with some very small design tweaks and possibly a frimware update for the IBIS issue when zooming non IS lenses . Id say its 90% there with regards to me being totally happy with it. Its very usuable as is however and the image quality is great, autofocus works great, the near full frame image is great... there are a lot of greats and not so many not so greats here.

Works very well. Gets most of your crop factor back and adds a stop to your lenses. Only issue is camera complains about it not being a standard accessory, but just requires an extra button push when turning the camera on. Used it to get some great astro photography shots.

Der Meike EFTR-0.71X Speed Booster für Canon EF Objektive an Kameras mit E-Mount (z.B. Sony) verspricht, die Brennweite um den Faktor 0.71x zu reduzieren und die Lichtstärke um eine Blendenstufe zu erhöhen. Die mechanische Passform des Adapters ist zwar in Ordnung, und er rastet sauber ein – damit enden die positiven Punkte jedoch größtenteils. Leider leidet die Bildqualität unter diesem Adapter massiv. Die Aufnahmen wirken selbst bei guten Lichtverhältnissen deutlich unscharf und stark verwaschen. Es zeigt sich ein auffälliger, störender Schleier (Glow/Flare), der besonders in kontrastreichen oder hellen Bereichen die Bilder unbrauchbar macht. Der Vorteil der erhöhten Lichtstärke wird durch diese optischen Mängel komplett zunichte gemacht. Auch die Handhabung ist verbesserungswürdig. Das Einstellen der Schärfe und Blende über den Adapter ist eher umständlich und unzuverlässig. Insbesondere in Kombination mit hochwertigen Canon EF L-Objektiven – für die man einen Speed Booster eigentlich nutzen möchte – ist das Ergebnis mehr als suboptimal. Man verschenkt das Potenzial dieser Premium-Linsen. Fazit: Wer einen Speed Booster sucht, um die Qualität seiner Canon EF Linsen an einer spiegellosen Kamera zu steigern oder zumindest zu erhalten, sollte von diesem Modell dringend Abstand nehmen. Die schlechte Bildqualität und die umständliche Bedienung machen den Adapter zu einer Enttäuschung.

Meike EFTR-0.71X Lens Mount Adapter Speed Booster 0.71x Focal Reduction Lens is good. But it can be used for Mostly EF full frame lenses and a few EF-S crop sensor lenses that I own below. The other EF-S lenses, I cannot even mount them. I wish I use it for all of lenses. Yes - Canon EF 50mm F1.8 Yes - Canon EF 70-210mm F4 Yes - Sigma 18-35mm F1.8 No - Canon EF-S 10-22mm F3.5-F5.6 No - Canon EF-S 18-55mm F3.5-F5.6 No - Canon EF-S 18-135mm F3.5-F5.6 No - Canon EF-S 17-55mm F2.8