BMPCC4K with Viltrox Ef M2 speedbooster

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edwardb

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BMPCC4K with Viltrox Ef M2 speedbooster

PostThu Oct 04, 2018 5:06 am

Can anyone out there confirm if this speedbooster from Viltrox would work with the Pocket 4K camera?
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Kristian Lam

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Re: BMPCC4K with Viltrox Ef M2 speedbooster

PostThu Oct 04, 2018 6:25 am

Yes, it will work except for autofocus which does not seem to trigger. I have already notified Viltrox regarding this issue.
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Cooper

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Re: BMPCC4K with Viltrox Ef M2 speedbooster

PostMon Jan 07, 2019 8:39 pm

So finally got the camera so can report that aperture works with the EF-M2 adapter from f1.2 to f11 (sigma 18-35), but only on firmware version 3.0. Out of the box for me no (qc 5.5.2018) or with the latest 3.2 no.

The speed booster is a bit loose against the BMPCCK4K, I would say it’s about normal amount of movement.

With sigma 18-35 it’s a bit bit too tight, so tight that the lense mount scrapes plastic from inside the adapter, there’s small leaf springs pushing the lense against the adapter. The aperture control is quite noisy, so if using the automatic exposure microphone needs to be far away... haven’t yet testes if low cut filters will help. Balance point with just camera with battery, adapter and lense with hood is about 2cm forward from the adapter.

Manually adjusting the sigmas zoom or focus doesn’t move the adapter. The adapters mounting point would need the be somewhat higher to be at level with the camera.
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Cooper

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Re: BMPCC4K with Viltrox Ef M2 speedbooster

PostWed Jan 09, 2019 7:19 pm

Today I got email reply from @jyk-hk that they are now “studying compatibility with the BMPCC4K 4K”. Much more promising reply than the previous one “no detailed schedule”. So perhaps firmware for viltrox ef-m2 that supports the pocket cinema camera 4K will happen sooner than later.
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Cooper

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Re: BMPCC4K with Viltrox Ef M2 speedbooster

PostThu Feb 07, 2019 6:57 am

Now that the camera got firmware update to 6.1, the previously working firmware 3.0 on the adapter stopped responding to iris changes. The adapter reports the iris value but can't change it and then looses the connection. With the 2.3 firmware for the adapter, oldest on the viltrox web page, the iris changing works.... still waiting for the new firmware from viltrox that supports focus and is + now an iris control fix.
Last edited by Cooper on Thu Feb 07, 2019 2:29 pm, edited 1 time in total.
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Randy Walters

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Re: BMPCC4K with Viltrox Ef M2 speedbooster

PostThu Feb 07, 2019 2:27 pm

For the record, I just picked up a Mitakon Zhongyi Nikon F Mount G Lens to Micro Four Thirds adapter (a steal – brand new at $59 on eBay, instead of $150 at B&H) and I’m blown away by how well it fits and works.

This unit has no electronic functionality at all, but it more than meets my needs – using my old manual Nikon glass with the BMPCC4K.

I’m just mentioning it as a viable option, among the other choices out there for speed boosters. I’m surprised and happy with the optical performance.
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James David

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Re: BMPCC4K with Viltrox Ef M2 speedbooster

PostThu Feb 07, 2019 4:03 pm

Randy Walters wrote:For the record, I just picked up a Mitakon Zhongyi Nikon F Mount G Lens to Micro Four Thirds adapter (a steal – brand new at $59 on eBay, instead of $150 at B&H) and I’m blown away by how well it fits and works.

This unit has no electronic functionality at all, but it more than meets my needs – using my old manual Nikon glass with the BMPCC4K.

I’m just mentioning it as a viable option, among the other choices out there for speed boosters. I’m surprised and happy with the optical performance.



In regards to the Mitakon Zhongyi Nikon F Mount G Lens -

Is there any cropping from the fact that is is Micro 4/3rds on the Pocket 4Ks sensor?
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Randy Walters

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Re: BMPCC4K with Viltrox Ef M2 speedbooster

PostThu Feb 07, 2019 5:19 pm

James David wrote:
Randy Walters wrote:In regards to the Mitakon Zhongyi Nikon F Mount G Lens -

Is there any cropping from the fact that is is Micro 4/3rds on the Pocket 4Ks sensor?


James, I’m not clear on exactly what you’re asking.

Here’s a sample; this is a full-frame micro-NIKKOR 55mm f/2.8 lens, which on a bare BMPCC 4K would give a field of view equivalent to 110mm.

Using the Mitakon Zhongyi, that ratio changes by .726, giving the equivalent of an 80mm f/2. We’re still not getting the entire content of the original full-frame circle, but we’re seeing significantly more than we would without the adapter.

Since the adapter was designed for a MFT sensor size, it should match up appropriately with the BMPCC 4K, if that’s what you’re asking. I hope that helps …

leo.jpg
leo.jpg (938.32 KiB) Viewed 352 times
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rick.lang

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BMPCC4K with Viltrox Ef M2 speedbooster

PostThu Feb 07, 2019 6:54 pm

James, full-frame photo lenses will not vignette with a .7x focal reducer in theory but good for Randy including the pic that illustrates everything is going “according to plan” and no funny behavior due to the BMPCC4K exceeding the normal mMT sensor size horizontally.


Sent from my iPhone using Tapatalk
Last edited by rick.lang on Fri Feb 08, 2019 12:52 am, edited 1 time in total.
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Denny Smith

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Re: BMPCC4K with Viltrox Ef M2 speedbooster

PostThu Feb 07, 2019 9:04 pm

And, a 55mm lens is more like a 100mm on the Pocket 4K Camera, when shooting full open gate (17:9 DCS).
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Denny Smith
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James David

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Re: BMPCC4K with Viltrox Ef M2 speedbooster

PostSat Feb 09, 2019 1:21 am

Thanks for answering. my understanding was that onyl certain speedboosters could be used with the new pocket... otherwise it would vignette

I have lots of Nikon glass like a beloved 24mm 2.8mm and i would like to use it with the new pocket with Nikon speedbooster,

do you think i would have a problem with this combination?

many thanks
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Denny Smith

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Re: BMPCC4K with Viltrox Ef M2 speedbooster

PostSat Feb 09, 2019 6:09 am

James, any Full Frame Nikon lens should work just fine with either Speed Booster. I use my Zeiss ZF lenses and they work fine.
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Denny Smith
SHA Productions
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NicWassell

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Re: BMPCC4K with Viltrox Ef M2 speedbooster

PostSat Feb 09, 2019 6:17 pm

Does anyone know if there is a problem updating (or in this case, downgrading) this speedbooster on a mac? Tried a couple of cables/ports and can't get it to mount on my Macbook so that I can change the firmware.

(It's not entirely clear from their instructions but I gather I should just be able to plug it in with USB and it should show up as a drive?)
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NicWassell

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Re: BMPCC4K with Viltrox Ef M2 speedbooster

PostSat Feb 09, 2019 6:33 pm

Ah finally managed it with yet another cable. Guess got to just keep trying...

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