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Go Back   Olympus UK E-System User Group > Cameras, lenses and system accessories > Lens focus > Converters, adapters and extension tubes

Converters, adapters and extension tubes All those lens accessories that get in between the lens and the camera.

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Old 26th March 2014
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Has anyone tried the Metabones Speed Booster?

Metabones doesn't seem to be a very friendly company - their website invites enquiries from the press but my email has not generated any response at all and I've heard the same from other journalists.

Anyway, Mark at Olympus UK is interested in evaluating the Speed Booster for Micro Four Thirds. What's a Speed Booster? It's like a teleconverter in reverse so instead of reducing the field of view (effectively increasing the focal length but costing brightness) a Speed Booster concentrates the projected light from a full frame lens, for example, so that it more closely matches the size of a smaller sensor, in this case Four Thirds. Take the Nikon G Speed Booster, this increases the brightness of the lens by 1 stop and shortens the effective focal length by 0.71x. If you fitted a Nikkor 50mm f/1.8 lens attached to a Speed Booster adapter to a Micro Four Thirds body you would get the equivalent of a 35.5 mm lens field of view and a maximum aperture brightness of f/1.2.

Bizarrely, Metabones don't yet make an OM to Micro Four Thirds Speed Booster, so for the time being you can only choose from Nikon G (Nikkor lenses with an aperture ring built in), Minolta MD, Contax/Yashica, Leica R, Canon FD and, of course, Contarex!

If you already have one of these can you get in touch? Thanks!

Ian
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Old 26th March 2014
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Re: Has anyone tried the Metabones Speed Booster?

I was tempted a while back. I figured the Tamron SP90 (already a sharp lens) could be made galactic with a speed booster... However I have myself a good talking to..
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Old 27th March 2014
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Re: Has anyone tried the Metabones Speed Booster?

I failed to give myself a good talking to and purchased a Minolta MD Metabones Speedbooster for a couple of good Rokkors and a Kiron i have. I intend to purchase one or two of the Chinese alternatives for other mounts.

I also have an M42 lens to MD adapter that works well (but i only tried a couple shots so far). The exakta lens to MD adapter i have found but not yet used it as i've been preoccupied for the last week, it doesn't sit right on the topcon-exakta lens i have without some modifications so i'm after a cheap exakta/exa lens.

Even the other competing focal reducer manufacturers are yet to produce an OM mount focal reducer. Maybe an old adapter could be used to adapt an OM lens to an existing reducer/speedbooster, small adaptions seem to work with perhaps just the loss of infinity focus.

I'm pleased with the speedbooster, images are sharper too and bokeh is unaffected. New life for old glass.
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Old 27th March 2014
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Re: Has anyone tried the Metabones Speed Booster?

Can you post some comparison shots?

Ian
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Old 27th March 2014
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Re: Has anyone tried the Metabones Speed Booster?

Yeah but i couldn't today -- a combination of my slightly better half, the hospital, and the weather. I'll try tomorrow.
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Old 27th March 2014
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Re: Has anyone tried the Metabones Speed Booster?

Quote:
Originally Posted by bredman View Post

Even the other competing focal reducer manufacturers are yet to produce an OM mount focal reducer. Maybe an old adapter could be used to adapt an OM lens to an existing reducer/speedbooster
One way around the lack of a speedbooster for OM mount Zuiko's is to change the Zuiko lens mount to a "Nikon F" via a Leitax replacement mount ( www.leitax.com ). The OM mount is one of the easier ones to convert and Leitax replacement mounts are of very good quality and the conversion is fully reversible, I've been thinking of converting my Zuiko's ( 24,28,50,100 F2 ) to mount on a Nikon F2 which is IMO the best 35mm "SLR" ever made, closely followed by the OM3Ti

Simon
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Old 28th March 2014
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Re: Has anyone tried the Metabones Speed Booster?

Quote:
Originally Posted by bredman View Post
Even the other competing focal reducer manufacturers are yet to produce an OM mount focal reducer. Maybe an old adapter could be used to adapt an OM lens to an existing reducer/speedbooster, small adaptions seem to work with perhaps just the loss of infinity focus.
Hi there Bredman!

You're giving me ideas here - cheap OM 2x teleconverter reversed inside an OM - m43 adapter giving me a 25mm f0.9 lens from my 50mm f1.8 - or even a 67.5mm f1.4 from my 135mm f2.8. Time to start tinkering again me thinks!

Cheers,

Ralph.
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Old 28th March 2014
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Re: Has anyone tried the Metabones Speed Booster?

The possibilities here are getting a bit mind blowing. I think it would help if some clever person could write an article or pull together an explanatory table on all the adapter-lens-booster options!
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Old 29th March 2014
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Re: Has anyone tried the Metabones Speed Booster?

Ralph, putting a reversed TC inside an OM to m4/3 adapter may put it to close to the sensor. Why not try simply reversing the mounts on a TC.
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Old 29th March 2014
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Re: Has anyone tried the Metabones Speed Booster?

That might be worth a shot, I was hoping to put it inside the adapter to keep everything compact with my micro 4/3 stuff - also I thougt I would have more scope for positioning the lenses within the adapter. I might give it a try though as it should be pretty non-destructive!

Cheers,

Ralph.
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Old 30th March 2014
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Re: Has anyone tried the Metabones Speed Booster?

I have a Nikon - M43 speed booster. So far I have only used it to turn my Nikon 500 f/4 P into a 350/2.8, but the result is very useful. No huge difference in sharpness as the 500 f/4 is already very sharp, but the extra stop is very useful in the winter, as well as for getting action freezing shutter speeds. Here's a few whooper swans I shot last weekend. THe first image was probably stopped down a bit, the other two were probably shot wide open.




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Old 6th May 2014
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Re: Has anyone tried the Metabones Speed Booster?

Here's the baby:




The EF conversion was made using a cheap M42->Canon EF adapter ring. The design of the x-Fujinon EBC 50mm f1.2 (which was rebranded as the Porst 50mm f1.2 UMC) is 7 elements in 7 groups. Minimum focusing distance is 45cm.

The results are very pleasant:

@f1.2 (f0.85 effective):




@f2 (f1.4 effective):




It is very sharp stopped down to f2.5 and higher.
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