You guys don't understand. It's all about the glass manufacture they buy from, Period. Has nothing to do with anything else.

What about Konica AR? ARe there any rumors?

Thanks Tscheckoff,

Well, I bit the bullet today and ordered the Speedbooster. It's a lot of money for what it is, but I guess it's worth it for what it does. Tomorrow it will arrive and will try it on my Samyang primes. I'm confident it will work. Let's see what happens to the 16mm with the SB. Someone has to try it 1st I guess :D

@Stab:

I think it´s a good decision. You can even try out the Sigma 18-35mm with it OR any other Nikon-F compatible glass (if you want to in the future). Btw.: It´s also REALLY intersting, how good the 16mm will perform with it (vignetting AND all in all). Can you maybe post a few examples as soon as you got the Speedbooster?

Btw.: Also important / don´t forget -> If you don´t like it you can also send it back to Metabones for 7 days (starting with delivery date). Altough it´s for sure also not hard to find a potential buyer in ANY online community ^^.

Please keep us updated! =)

@DrDave

No, how can two totally different lens mounts (Nikkor F and Rokkor MD) attach to a SB that is designed specifically for one or the other?

Perhaps I'm misunderstanding your question...especially "connect the Nikkor to the Rokkor"

ordered the Nikon and Minolta booster - will report back with 11-16 Tokina Nikon mount - 16 2.8 and 21 2.8 24 2.8 35 1.8 58 1.2 85 1.7 85 2 and 100 2 Rokkor when I finish this mix next week! Early excitement with 58 1.2 - is lovely bokeh and character looks undisturbed - out with the adapter and tomorrow with the 100 and 35 in the studio so maybe boring fader shots but post all at end of week. Looks smashing though - more attractive than my CY collection - 28 2 35 1.4 and 85 1.4 but horses and courses! I do like the Rokkors ;p

@soundgh

c/y speedbooster makes a massive difference for m43 sized sensors. The Zeiss glass look so much better when closer to full frame.

Thanks @JuMo ...just ordered the MFT>FD

Ok I got the speedbooster, but I'm afraid it is faulty.

I bit the bullet and ordered the SpeedBooster to use with my Samyang primes on the GH3. I thought it was working great, until I wanted to change the aperture on my lens. No matter what I did, the aperture was stuck at wide open. I tried mounting it at different aperture settings (both the SB and the Samyangs) but to no effect. In some positions I was able to close the aperture with the SpeedBooster ring from f1.4 to f2.8 but no further.

So I looked at the Speedbooster and saw that there is something loose that I think is not designed to move. It is clear that the Speedbooster doesn't 'grip' the aperture rings of my lenses. When I pull the lever on my lenses myself, it works correctly though.

I know that the Speedbooster's aperture ring should be at position '8' before mounting the lens to ensure you can use the lens' aperture ring. Did that, no effect. When I turn the aperture ring, it stays wide open...

Here is the metal thingy that is loose to the touch. The left arrow shows the part that is moving when turning the aperture ring of the Speedbooster.

It was the last Speedbooster in stock at the shop I bought it from. At the moment they are 'seeing what they can do', but I won't hear from them until tomorrow. I have an upcoming shoot this friday. Is there anything I can do?

And, there might be another option. Maybe I am an idiot and I missed something??

Thanks for helping!

I have often set my aperture with a toothpick if the lens has a lever.

When it dawned on me that with my recent Zeiss C/Y 35mm 1.4 and the SB I have something in the range of SLRM 25mm and Voigt 25mm, I arranged some pixel peeping with a colleague today.

Result: The Zeiss with SB is about one third stop slower than the SLRM or Voigt WO. The center is 100% as sharp as the SLRM, the corners are sharper. The Voigt is softer WO, but the corners are better than SLRM and a tad softer than Zeiss+SB.

At 1.4 the Voigt is gaining ground (I seem to have a good one), center as good as the others, corners nearly as good as Zeiss+SB.

At 2.0 the Voigt is slightly ahead in the corners (less CA in particular). Even at 4.0 the SLRM never get's harp in the corners, both Zeiss+SB and Voigt are far better.

Just like the Voigt, the Zeiss has no play in the focus mechanism, the SLRM has some. Zeiss and SLRM have the same NFD around 26cm, Voigt is nearly a macro at 17cm. The SLRM is more yellow, the others are close to neutral.

The only disadvantage of the Zeiss is weight, 760 g with SB vs. 450 for the others. But, OTOH, you are then carrying two lenses in one.

Bokeh: Well, my Zeiss makes nice OOF shapes WO, but has the Ninja shape when closed down one or two stops. The Voigt is good WO, but get's a bit angular stopped down. The SLRM is really nice in this respect, but has massive coma in the corners.

My two cents: None is perfect, but nobody will need all three.

Oh, and by the way, the Minolta Rokkor 24mm at 2.8 is a beast too, it can hold it's own against the Zeiss+SB at 4.0 (eff. 2.8): sharper and more contrasty, just a tad more CA in the corners.

I have been testing the MD-M43 Metabones Speed Booster and I am very pleased with the IQ. I have found a problem that's very related to @Stab 's. First, the 58mm/F1.2 works great in every way; it has a sizable rear glass element without any issues with the "tab". Pretty much all the rest of my Minoltas need some tweaking of the old focusing tab. I am enclosing a photo of what I have had to do to the 35mm/F1.8, 85mm/F2.0, 100mm/F2.5, and the 135mm/F2.8. The tab rubs on the Metabones glass perimeter keeping the lens from closing all the way. For example, the 35 could only close to about 5.6 With the slight bending of the tab towards the outside, all the lenses wok fine.

Here is an HDR test that I did using the MD-MFT Speedbooster with my Minolta MC (2nd Gen) 16/2.8 on the GH2. It is through the window of my hotel room which does not open. Sadly, you can see a bit of a tripod leg reflected in the lower part of the image.