Could anyone please help me out with understanding one thing...

I have a GH3, and would like to put on the lens turbo. Problem is that I have lenses with M4/3 mount, Nikon mount, and Konica. For these lenses I use different adapters to adapt them to my GH3 mount. Now, if I put on the lens turbo, can I get it with M43 mount so that all my adapters for my different lenses still work? As far as I can see the lens turbo has mounts for Nikon, Canon, and some other but not with a M43 mount.

I could imagine how awesome my Voigtlander 25 0.95 would be with the speedbooster!

@Vitaliy_Kiselev

Thanks for the reply Vitaliy, and thanks for the link. But that's not really what I asked, I'm well aware of different lenses and mounts and how it all works. My question is simply: Is there a lens turbo that still gives me a M43 mount to mount my other adapters for such as Nikon to M43. As far as I can see, there is not lens turbo or speed booster that offers that.

@Adde

I'm well aware of different lenses and mounts and how it all works

??...apparently not ! Even 3rd party lenses that would offer a sufficiently large image circle with m43 mounts , like the rokinson's for instance would not be able to be speedboostered because using the m43 mount version makes these lenses from the lens element to the flange longer allowing no space for a speedbooster. For example, look at the specs for the robikon 14mm ef and m43 versions. The ef version is 3.8 " long while the m43 is 4.76" . That length difference is where the speedbooster would fit. So if you want to use a speedbooster , it's got to have sufficient space between the lens elements and the flange.

Alright, enough lambasting the kid. @Adde, you came across as pretty arrogant, saying you know all about lenses when it's clear that you do not, so that's why you're getting the response you are. I'll try to help you a bit more.

The whole idea of a speed booster is that it is taking lenses that were designed to focus the light onto a 35mm frame of film or 35mm sensor, and refocus that light down closer to the ~17mm of the m43 sensor. So that's why there are speedbooster adapters for the Canon, Nikon (designed to hit 35mm) to m4/3. It's focusing it from something bigger to something smaller.

The cheep dumb adapters with no glass in it allow you to mount those old 35mm lenses on your m4/3 camera, but they aren't changing the light at all. They are simply moving the lens to the correct distance away from your camera so the light is focused when it hits the sensor. But there is also a lot of extra light hitting the camera around your sensor that would be hitting the 35mm film if it was on the camera it was designed for. That's why the shots are tighter. You are really only seeing a small rectangle crop of the image projected by the lens onto your sensor.

Now, a m4/3 lens is designed to focus the light only onto a m4/3 size sensor, so it doesn't have this extra area of focused light, because it's not designed to hit 35mm film (or sensor). There could be a speedbooster from a m4/3 lens to something with an even smaller sensor, but off the top of my head (I'm sure there ARE some out there) I can't think of an interchangeable lens system with a smaller than m4/3 sensor. But if you

I hope this helps you understand a bit more.

By saying that I understand how it works I did not mean the lens turbo, but more if another adapter stacked to the lens turbo would work. I didnt mean to sound arrogant at all actually, and I cant understand that people get so offended over a simple question. Anyhow, Blazer and all other that explained, thank you very much, appreciate it a lot!

I can't think of an interchangeable lens system with a smaller than m4/3 sensor

@blazer003

....bmpcc....nikon 1, pentax q, samsung nx mini

IMO RJ adapter is the best adapter.

1. Price
2. Design
3. Very good optical quality just as good as Metabones.

Ok, so I have the Metabones, RJ speed booster and the Mitakon.

In terms of sharpness IMO opinion the Mitakon is the best. However, it is ever so slightly better and you have to pixel peep to notice the difference. The Mitakon has the biggest shift in terms of color in comparison to the Metabones and RJ speed booster.

In terms of design I prefer the foot of the RJ speed booster over the Metabones for several reasons. The detachable arca swiss compatible foot on the RJ speed booster can be removed with just a simple turn of a knob, the Metabones requires tools to remove the arca swiss foot. Also the RJ speed booster arca swiss foot has more clearance then the Metabones so if you have a larger lens this will be very helpful.

I use Arca swiss compatible quick release clamps and plates for all of my gear. The Metabones arca swiss compatible foot is really really small so if you try to adapt another arca swiss quick release plate to the Metabones foot you will need to take the plate off each time when removing the plate from the Metabones foot because it will hit the camera. The RJ speed booster does not have this problem because the foot is bigger so I can leave my quick release plate on at all times. I buy arca swiss plates and put them on all the gear that I have the problem with the Metabones/RJ speed booster foot is that they do not have the safety pin that will prevent your camera from sliding off the tripod onto the floor etc.

This is difficult to imagine if you don't have the gear but trust me it makes a big difference and saves time.

Here is a drop box link to see the results. https://www.dropbox.com/sh/jbknoguj4ijttlx/AADnY6I71BPnthqaRElvHg7Ua

Yes very helpful indeed and this is why I prefer this over the Metabones, of course the price is really sweet too :-) you could purchase 3 RJ speed boosters for the price of 1 Metabones speed booster. Thanks Vitaliy....

@kurth

Did you look at the images from the drop box link? there is your proof. And if you don't believe me that is your prerogative. I have nothing to gain buy showing my results however Caldwell may have his own ulterior motives. I am showing my results from the tests that I conducted on all three speed boosters, and as far as I am concerned they are all good. However knowing what I know now I would purchase the RJ speed booster. Although the Mitakon has a sharper image it also has a major color shift in comparison to the Metabones and RJ speed booster, on top of that you cannot control the aperture so you cannot use modern G series lenses with it so for me the Mitakon is out of the running.

I am not sure which version of the Mitakon speed booster I have but I purchased it about 3 months ago. In terms of the Metabones and the RJ speed boosters I just received them last week. I have nothing to gain nor any ulterior motives buy posting my results. I am trying to help others who may be on the fence about purchasing these items. Like I said you can purchase 3 RJ speed booster for the price of one Metabones. The choice is yours I am presenting you with the facts according to the tests that I have performed. They are all good....

Pictures in the drop box link were all taken on a Panasonic GH4 on Samyang 35mm 1.4 @ F5.6 in my studio. I went the extra mile and took six photos with each speed booster. For each of the six photos that I shot on each speed booster I manually focused each of the six shots to insure the best results out of each speed booster. Then I selected the best photo out of the 6 photos that I took with each speed booster. This was a well controlled test so as I said if you don't believe me that is your prerogative.

@Azo ....no one was calling you a liar. And I didn't see the link to your images at first but today I peeked. The rj looked ...better ! All I can say about your test is I would like to see the samyang wide open . I'd bet at f1.4 there'd be a different result. Just guess'n but ....anyway it was pleasantly surprising.

Hey guys, just a quick first impression here: I just received my RJ Nikon F/G lens turbo with tripod mount, and I really couldn't be happier. The quality of construction seems very nice, and the optics appear to my eye to be very nice so far.

I have a 50mm 1.4 AIS lens that is just a little soft at 1.4, and without doing any real pixel peeping so far, if anything it seems like it might have sharpened the lens up a hair at 1.4. Previously I'm not sure I would have used this lens at 1.4 if I could avoid it, and with the lens turbo on it, so far I don't think I would have any reservations about it... WIN! :)

Anyway, I'm happy -- Thank you @Vitaliy_Kiselev

@Azo, thanks for taking the time and doing a comparison! Do you happen to have any comparison between the different boosters with the Samyang 35mm at the maximum aperture (f1.4)?