@Tone13 The blue dot is kind of an elusive problem. I personally have seen it in my Lens Turbo, but it's not as drastic as my SLR 12mm or my old Canon FD lenses.

@cantsin I have the EF version and it fits fine on both my BMPCC and GH2.

@brianl Cheesycam had issues with Mitakon's version, not RJ's.

I have the EF version, mine fits like a glove on the pocket, like my m43 lenses.

@red_pill

no, you probably have 1st generation

@kurth it may be, I bought it in december. Never heard of this difference between 1st and 2nd generation..

@red_pill I've seen the blue dot on the RJ Speed Booster before but not as often as some other users it seems. It's actually more or less the same as the older FD glasses I have, which I don't recall people complaining about. The SLR Magic 12mm is another lens where I've encountered the blue dot which IMO is worse than the RJ Speed Booster, but I don't here people complain about that either. With the RJ Speed Booster/Rokinon 16mm f2 combo, I actually see less of the blue dot compared to my SLR Magic 12mm. I've posted images below that compare the two for anyone interested.

And unfortunately the blue dot doesn't disappear when the aperture is wide open. It's just less pronounced than when the aperture is closed down.

@kin869 are those photos you posted suppose to show the blue dot because im not seeing it.

The low or available light applications for the reducer are still valid so I'm only partially retracting my earlier endorsement of this reducer. But the blue dot makes the other half of the proposition, namely getting a 35mm-wide-angle-equivalent FOV with a Sigma 10-20mm at 10mm in all (outdoor, sunny, etc) lighting conditions a no-go. So for less than half the Metabones you get more than half the functionality. But to be honest I'm hoping, likely in vain, for a refund. Mostly on principle, I guess, what with the false advertising. If I have to I'll keep the RJ and use it in situations I know won't produce the blue dot. Either way it looks like Metabones at this point to be able to use the 10mm on the BMPCC. Which, tangentially, is going back to the store thanks to Micro-HDMI port breaking. Yesterday was not a good day for recent equipment purchases. I might be more pissed off about the blue dot if my camera wasn't going in for repairs! And, if it matters at this point, the RJ Lens Turbo Nikon mount fit perfectly on a BMPCC, GH2, GH1, and GF3.

@Tone13 I got mine through the Deals on this site. All the products I have talked about are the same product, and is the same as the one you received. And you will get the blue dot.

I received my RJ FD adapter. The blue dot is only noticeable to me when shooting at direct light source. I'm still going to use it either way. I personally don't see it as a big deal.

guys, any news on Minolta MD version?

Pretty happy with my EOS-M4/3. Snug fit on lenses (Leica+Leitax EOS). Little play (rotation play) camera side. Back focus was off and I appreciated you can fix this.. Here's a test with Tokina 11-16, Olympus 12 (M4/3), Leica 19, 28(28-90), 35, 50, 90, Zeiss 180, Sigma 400. Tack sharp stopped down to 5.6. Soft wide open. Shame, I did not tested yet 1 or 2 stops from max aperture.

I just got mine in PK -> m4/3. Didn't realize that the Pentax mount did not have the iris control - makes it harder for me to use it as I intended (sigma 10-20). For future purchasers, may be worthwhile editing post #1 to identify which adapters have aperture control and which don't.

John