Unfortunately, FD does not adapt to eos without an additional optical element to compensate the flange distance so you can't mount FD glass on the eos RJ but the other way around may be possible...

@Adam_Mercier that's exactly what i mean, keep Canon EF, Nikon F and Canon FD glass, mount all of them on FD->m43 adapter since both FD and F have higher flange distance.

Nonetheless, i don't quite see many adapters to use Canon EF glass or Nikon F glass on FD.

Just received my FD -M4/3 RJ Lens Turbo and I was pretty impressed! The build quality is nothing to rave about but for $139.00 USD it does what it is supposed to!

My copy has a substantial amount of dust between the lenses unfortunately and when I contacted RJ, they suggested I pay to ship it back or take it apart and clean myself ( not great customer service )

As far as performance goes, the Lens Turbo goes above and beyond what I expected. The sharpness doesn't seem to drop off as much as I was told around the edges and the centre is tack sharp.

I have used it with both my 50mm f1.4 and 24mm f2.8 and they perform equally well when compared with and without adapter.

It is so nice to have the option to get closer to the true focal length of the lenses, but I have realized since getting it that I kind of liked the fact that a 50mm is closer t a 100mm lens at 1.4 on my GH3 it gives such an intimate feel on my videos that it may take some getting used to what a 50mm lens SHOULD look like!

I will be posting some tests with and without the lens as soon as I get some spare time.

Overall, I recommend buying the adapter to see what it can do for you.

Hopefully you get a copy that has no internal dust!

Oh good to know! Thanks Vitaliy! I will attempt a cleaning tonight. Either way the product is a hit as far as I'm concerned! I shot some video of myself performing an acoustic set at a bar in my town as well as shot some photos of the opening band and will post them tomorrow hopefully!

Here are some photos from my first shoot using the RJ FD to M4/3 lens turbo.

These were taken using a GH3 with an Canon FD 24mm f2.8 and 50mm f1.4 wide open.

I am really happy with the results as far as sharpness and CA everything looks pretty darn close to 35mm equivalent and makes it much easier to get a wide shot in a tight space!

Another video test, this time the blue dot issue is disturbing me a little bit...

Has anyone seen a comparison between the RJ lens and Metabones Speed booster? Searched but havent found anything.

Didn't try very hard, did you? ;) http://www.dpreview.com/forums/post/51792972

I don't believe that's true about the fd version . All fd lenses have aperture rings.

@MarcioK well, maybe I live in a limited world but I've never seen an fd adapter with aperture control, nor can I even fathom a guess why you'd want one. Nor can I find one with a little googling. I see some fd to eos with focus confirmation. All fd lenses have an aperture ring . The nikon G to m43 focal reducer adapters have one 'cause alot of nikon g lenses don't have aperture rings and must be set in camera. The eos/m43 focal reducer adapter doesn't, so you'd either have to use a nd, or change the eos lens aperture on an eos camera. I'm sure RJ had a reason why they couldn't do the same on eos.

Maybe someone could come up with fstop inserts like lensbabies ?

I personally wish RJ had made the eos/m43 just like the nikon g....but they didn't ask me. Are you sure you're not thinking of "eos" to m43 or nex lens adapters having aperture control ? There's alot of eos to m43 adapters with control. I've seen a hundred of those. And I'm still tryin' to understand your "function" explanation. I think you mean "fully close" because you'd normally open the lens wide open, and adjust the aperture on the adapter.

What's even more confusing is that RJ appears to be allowing these to be marketed under different brand names as well, making identifying the particular manufacturer based purely on product images on ebay and amazon. I think I count about 6 different brand names, other than RJ, of these identical adapters ! And what's even more confusing is these offbrand retailers are picturing the wrong adapters in their descriptions. For example, one shows images of an eos/m43 on a fd/m43 page, which made understanding the situation more confusing still.

And I found the dpreview link informative but obviously weighted to NEX cameras using fd mitakon lens turbos.

I think these are cheap enough to own more than one.

The only downside is the canon mount doesn't have an aperature ring? So my tamron 17-50 is toast?

You mean EF? EF mount lenses do not have any levers ala Pentax, Nikon, etc. Hence only specific electronic adapters can change aperture.

@kurth

All FD adapters I've seen have a ring to operate the aperture mechanically just like the "Open" / "Stop down" button on the cameras. It's not meant to move the aperture to a specific value, though.