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Blackmagic Pocket Cinema Camera 4K

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12 minutes ago, MeanRevert said:

Wow, what a development!  Does the unit have a follow-focus gear to integrate with manual focus lenses or does it only work with Panasonic/Leica lenses?

It works with any native MFT lens and EF lenses on a Metabones smart adapter.

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2 minutes ago, BTM_Pix said:

It works with any native MFT lens and EF lenses on a Metabones smart adapter.

Knowing how much better the native lenses autofocus, I suspect the performance is much better when not using adapted lenses.

5 minutes ago, BTM_Pix said:

It works with any native MFT lens and EF lenses on a Metabones smart adapter.

By the way, is the communication two-way? I mean, if I select a focus point using the touch screen, are you able to use that information with your focus system to maintain focus?

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5 minutes ago, drm said:

Knowing how much better the native lenses autofocus, I suspect the performance is much better when not using adapted lenses.

Its manually autofocusing (as contradictory as that sounds) so the behaviour is different to the internal one shot AF.

 

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26 minutes ago, BTM_Pix said:

It works with any native MFT lens and EF lenses on a Metabones smart adapter.

Ok, so for something like the Voigtlander lens, will that work because it's a native MFT lens but doesn't have AF?

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5 minutes ago, MeanRevert said:

Ok, so for something like the Voigtlander lens, will that work because it's a native MFT lens but doesn't have AF?

You need a bigger moter in this case.

 

😄

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41 minutes ago, MeanRevert said:

Ok, so for something like the Voigtlander lens, will that work because it's a native MFT lens but doesn't have AF?

His solution doesn't use a follow focus motor, so this won't allow you to autofocus manual lenses. He solution sends the focus distance to the camera, which then sends that data to the lens, which performs the focus movement. 

I suspect that he could quickly modify this solution to send the commands to a follow focus motor instead of sending the focus commands to the camera.

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1 hour ago, drm said:

By the way, is the communication two-way? I mean, if I select a focus point using the touch screen, are you able to use that information with your focus system to maintain focus?

In this iteration, no.

But it forms part of a more comprehensive focus controller that Andrew will be doing a piece about that will give more context to the reasoning.

6 minutes ago, drm said:

I suspect that he could quickly modify this solution to send the commands to a follow focus motor instead of sending the focus commands to the camera.

Indeed.

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So far this looks like more of a wireless focus system, without need for a external focus unit. Kudos! 

However, for continuous autofocus, I seemed to have missed it. This looks like a straightforward rack focus between two set points. 

If you’ve in fact developed continuous autofocus, is it happening within the center frame or is tracking a particular focus point (presumably through touchscreen)?

Great work either way.

 

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1 hour ago, independent said:

So far this looks like more of a wireless focus system, without need for a external focus unit. Kudos! 

However, for continuous autofocus, I seemed to have missed it. This looks like a straightforward rack focus between two set points. 

If you’ve in fact developed continuous autofocus, is it happening within the center frame or is tracking a particular focus point (presumably through touchscreen)?

Great work either way.

 

It is continuous but we were just moving between two targets.

If the man had come over to steal the plant it would have tracked him and ditto if the plant had come to eat us.

It tracks nearest point but is driveable.

Take what it is that you see it doing now as a jumping off point for what is possible as more info and nuance will be released over the coming months.

I'll keep it out of this thread now and in the main one so normal Pocket4K discussions can be resumed.

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Just now, BTM_Pix said:

It is continuous but we were just moving between two targets.

If the man had come over to steal the plant it would have tracked him and ditto if the plant had come to eat us.

It tracks nearest point but is driveable.

Take what it is that you see it doing now as a jumping off point for what is possible as more info and nuance will be released over the coming months.

I'll keep it out of this thread now and in the main one so normal Pocket4K discussions can be resumed.

LOL...one of the main P4K complaints is related to its focus ability (or lack thereof), hence the interest in your type of solution :). Although, this could be said of many of the cinema cameras.


To be honest, I am only somewhat satisfied with the push to focus on the P4K. It works some of the time. I use manual focus with focus peaking most of the time but I do use the push to focus on shoots sometimes to get initial focus. Unfortunately, the P4K push to focus also flakes out some of the time. For example, during my last shoot I noticed several times during the day when I used the one touch AF on the P4K that the camera would get confused, then focus in and out repeatedly, then ultimately fail to focus (with the Olympus 12-100 f/4). (it was a run & gun type shoot)

Even though my GH5 & GH5s cameras have continuous autofocus, I never use it. I set them to one touch AF, just like the P4K. I can't stand to see the pulsing while the camera is trying to focus. If I see that Panasonic focus pulsing in one of my shots, I would consider that shot ruined and not use it.

I would love to have a reliable *non-pulsing* continuous autofocus system that I could turn off when I didn't want it.

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This can be set to be the equivalent of back button focus so it can be momentary and only active while you have the controller wheel pressed in.

When released, it detaches and you can use the manual focus wheel or just leave it parked until you engage it again etc.

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4 hours ago, Kisaha said:

@drm i am planning to use the P4K with the 12-100 Olympus for r n g situations. Can you comment on the combo?

Does the lens's IS help a bit? 

I see you have issues with the AF..

Kisaha, I have a lot of m4/3 lenses (maybe 20? and Canon) but use Olympus 12-100 lens a lot. It is great because it is a constant f/4 and has a great range. The lens is also very sharp and well built. The lens IS *does* help and works well.  

I also use the Panasonic 12-35 & 35-100 f/2.8 lenses regularly. I find that I use the Olympus 12-100 lens in run/gun situations more than the Sigma 18-35 because of the better zoom range on the Olympus (plus you get IS).

After reflecting on the issue, I think that the focus issues with the Olympus lens that day were mostly due to the environment in which I was shooting. It was very bright outside and I was running handheld (cage, side handle, SmallHD monitor on top).  If you hold the camera still when focusing, the one touch focus works well. If you move the camera while focusing, you can cause the camera to freak out. I suspect that I didn't do a very good job holding the camera still that day :)  In the studio and most other times, the one touch focus has worked very well. I can't recall ever having that many focus issues before on a shoot, so, I chalk my problems that day up to user error. It didn't help that I couldn't see the screen very well in direct sunlight.

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A very interesting test of Rick Lang on BM forum (here) : a comparison between Q0 and Q5. One his conclusions: "Q0 versus Q5? Of course Q0 must be better because it’s a lot higher data rate. The design goal of the ‘Q' is a quality image and how could Q5 match Q0 with so much less data? In a word: it’s Blackmagic. Sometimes some elements in either Q5 or Q0 are ‘better’ than the other; it’s not a race in which one runner is in the lead throughout the race. Q5 makes some sacrifices that you can see, but it seems to have some less understood running style and I have to admit in this video, it emerges victorious, not only in fidelity but also edge sharpness."

 

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3 hours ago, Novim said:

A very interesting test of Rick Lang on BM forum (here) : a comparison between Q0 and Q5. One his conclusions: "Q0 versus Q5? Of course Q0 must be better because it’s a lot higher data rate. The design goal of the ‘Q' is a quality image and how could Q5 match Q0 with so much less data? In a word: it’s Blackmagic. Sometimes some elements in either Q5 or Q0 are ‘better’ than the other; it’s not a race in which one runner is in the lead throughout the race. Q5 makes some sacrifices that you can see, but it seems to have some less understood running style and I have to admit in this video, it emerges victorious, not only in fidelity but also edge sharpness."

 

I recently did a two-day commercial shoot using Q5 exclusively. There were extreme variations in locations and lighting, but I am very pleased with the results. I haven't seen a single thing where I felt that I needed to use Q0. I am personally surprised that Q5 is as good as it appears.

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Consider my mind blown... I will have to do some testing with my cameras now.

Native ISO is really 400 and 4000, and it clips at lower levels as the ISO drops below the default ISOs. ISO 100 = 83% clipping point.

https://www.youtube.com/embed/hV7ixU2AmLE

Gerald Undone: Exposure Tips for the BMPCC4K & Why I Don’t Use ProRes

Note: How to I embed a YouTube video?

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