@red_pill

no, you probably have 1st generation

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

@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.

On the Blackmagic Pocket, my copy of the RJ Lens Turbo fits the mount but has a too tight fit to be clicked/screwed in; on the GH2, it's very tight but can still be screwed/clicked in and out with some use of force; on the GH1, it's an easy fit. Since this is my second copy of the RJ which shows these issues, they seem to be systematic rather than coincidental.

Have other people experienced the same problems? Is there an easy fix (aside from returning the adapter)?

@dishe,

That recent test you posted looks pretty good. I thought you would see the blue spot in a few of those very bright shots but nothing!

Has the blue spot issue largely been fixed now?

If anyone has more of some sample footage, pictures, real life tests, then i'd be happy if you would share links or files..would make my decision easier...this or the 3 times more expensive metabones..[/QUOTE]

@marx92 here's a recent test :

@Qadri

I have the FD 35-105 with RJ Turbo and a G6. I think it's fine for indoor video up to ISO 1600. For stills, not that much.

I have that lens and a G6 as well. To be honest, I heard great things about this zoom when I bought it, but I've never really been all that impressed with it in practice. Its a super versatile range, and it looks really professional on a tiny camera body, but I wouldn't buy another one if anything happens to this one. If only I could afford that lumix zoom at f/2.8... I thought maybe a lens turbo would make it more attractive, gaining a stop of light and everything, but from what I've seen so far (just picked one up myself), I'm still not loving it. :/

@oscillian -you're shooting video at 1600 ISO?? I have been told to avoid going over ISO 400 as causes noise and reduces dynamic range? I've never tried it, or risked it as I should say. If it does not impact quality then I guess I could make a lot of use out of that lens. Please can you elaborate further?

If I won't see much improvement with a speed booster on the 35-105 then I'll put that money towards perhaps a more modern brighter (prime) lens.

I am not sure that adapter will make it ultra sharp. Only some of old zooms are sharp.

I just noticed that the Tamron 17-50mm f2.8 is working very well with the RJ Speed Booster and I didn't even notice that the lens is Parfocal and remains so with the adapter. This is a very good combination for my GH1. I stop down just a touch and this lens is sharp enough for my needs and still bright enough indoors. Still very useable wide open.

@bobdrenth, the aperture has an extremely short throw. IMO there's no way to accurately make adjustments with it. You have to be very gentle with the adjustment since the entire range is 3/4 of an inch. However it doesn't move in my experience.

The entire RJ adapter is solidly made and fits tightly with no movement or jiggle. There are some notches that you could use as a guide visually but the aperture adjustment is smooth with no stops, which actually is a good thing. I only use the aperture to stop down about 1 stop anyway. I'd use ND for anything more.

The beauty of the Tamron 17-50 is that it's pretty good wide open and just one stop down at 17mm it's as sharp as it can get. Throughout the range of the zoom you're best results are at f4-5.6, so you really get a nice advantage from the RJ speed booster in that it's giving that stop brighter image. So you get a lens that is f2.8-4 when set at f4-5.6, roughly. On my GH1 the lens is excellently good wide angle at 17mm. I'm very happy with this purchase.

@Renovatio, I don't see much of a need for IBIS at these wide angles on the 17-50mm which as you point out is pretty wide on the GH1. I'm probably gonna use a small Steadicam anyway. I don't mind the size of the 17-50mm on the GH1. It's a little big, but not unwieldy. This is an underrated Lens IMO. The Speedbooster really makes it a great tool. It covers most of my needs and I can use it with a future GH4 down the line.

@Renovatio, I just got my adapter Nikon G in the mail today and used it on a job. It was great. Nice and snug fit on my Tamron 17-50mm f2.8 on my GH1!!! The extra speed was welcome and it was nice and sharp, since I was able to stop down just a touch and hit the sweet spot of the lens. I'm VERY HAPPY with this buy. Wish there was such a thing possible for my Canon 50D with ML RAW.