EF lens focus in SUP 5.0

Sat Jul 01, 2017 9:46 pm

In the release notes for SUP 5.0 it is stated that the WCU-4 can control both focus and iris of EF lenses. But in the user manual it's indicated that only iris control is possible via the WCU-4. Focus control is only available for the master grips.

Which is it? Or am I misreading anything?

Kind regards,

Joachim
Joachim Heden
 
Posts: 5
Joined: Wed May 31, 2017 5:15 pm

Re: EF lens focus in SUP 5.0

Sun Jul 02, 2017 1:30 am

The WCU-4 user manual is from last year and needs to be updated.
With SUP-5 you can control both, iris and focus of an EF lens from the WCU-4.
Keep in mind that most EF lenses do not carry distance data, so you won't see marks on the right side of your WCU-4.
Best,
Guenter
Guenter Noesner
 
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Joined: Mon Nov 23, 2015 6:13 pm
Location: New York

Re: EF lens focus in SUP 5.0

Sun Jul 02, 2017 9:41 am

Hi Guenter,

I wasn't referring to the WCU-4 manual, but rather the Alexa Mini user manual updated for SUP 5.0, dated June 27th 2017.

In section 4.8.2 it seems focus control is not possible with the WCU-4, only iris.

user_manual_4_8_2.jpg
Joachim Heden
 
Posts: 5
Joined: Wed May 31, 2017 5:15 pm

Re: EF lens focus in SUP 5.0

Sun Jul 02, 2017 5:42 pm

oh, that is new indeed
I'll have to verify again next week.
Guenter Noesner
 
Posts: 17
Joined: Mon Nov 23, 2015 6:13 pm
Location: New York

Re: EF lens focus in SUP 5.0

Sun Jul 02, 2017 10:11 pm

Also looked at the release notes for WCU-4 SUP 3.0 dated June 29 2017.

In the release notes EF lens support for focus/iris is not mentioned specifically. But under section G (known issues) it's stated that there are problems with accuracy of set focus marks and pre marked / custom rings when using EF lenses...

So, there seems to be some confusion on EF focus abilities of the WCU-4...

Alexa mini SUP 5.0 release notes: It works.

WCU-4 SUP 3.0 release notes: It kind of works.

Alexa mini SUP 5.0 user manual: It doesn't work.

Which is it?

Anybody tried yet?

J
Joachim Heden
 
Posts: 5
Joined: Wed May 31, 2017 5:15 pm

Re: EF lens focus in SUP 5.0

Tue Jul 04, 2017 11:02 am

Sorry for the confusion...

It does work on the WCU-4, but it has severe limitations as the EF Lenses are not using absolute positioning.
The focus dial on the WCU-4 will not relate to a focus position (it will slip over time) and since the dial has end stops you will inevitably run into them. You can then use the zoom rocker to adjust the position again. No way to use markers or pull focus the common way.

It will work if you need to get the focus to a specific setting on a drone or for very simple use cases.

So pretty limited... and that's the reason for the confusion. It's not a real feature actually - more of a side product of the work we did for the Mastergrips.

If you haven't tried. The Mastergrips and EF lenses ROCK!!
Michael Jonas
 
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Joined: Thu Mar 26, 2015 3:28 pm

Re: EF lens focus in SUP 5.0

Wed Jul 05, 2017 1:30 pm

Ok, got it.

Will try it for what it is and see how useful or not it can be.

Are these issues that you expect to be able to address in future updates to enhance functionality?

J
Joachim Heden
 
Posts: 5
Joined: Wed May 31, 2017 5:15 pm

Re: EF lens focus in SUP 5.0

Fri Jul 07, 2017 3:26 pm

Ok, so updated to 5.0/3.0 and...

Yes, No -- EF lens focus doesn't really work work with the WCU-4. You can "drive the lens" but just like was said above, the focus wheel will have no "absolute position" so it is quite impossible to work with any kind of marks. Also, the focus wheel will easily go "out of range" -- you will hit the hard stop of the knob before you hit infinity/MFD. Some patience and clever twists and turns of the focus wheel can bring it back into "full range" (or you can dig into the menus and re-assign the focus axis to the Zoom-rocker and use that to bring the lens back into the "knob range". Also, while "driving the lens" is pretty smooth, it will occationally go spastic.

Iris control however seems to be rock solid.

Hopefully full EF functionality will be gained in future SUPs because it would be very practical to have...

As it stands, the Optitek solution seems to be the only workable solution for reliable EF lens focus control. It works really well actually. Absolute positioning and perfect repeatability, so premarked rings and marks (pen) works.
http://optitek.org/products/canon-prolo ... i-cameras/

So for now franken-WCU-4 is it if you want workable remote EF focus control and all the other goodies of the Arri unit -- I'm only half kidding ;-)

Franken_WCU.jpg
Joachim Heden
 
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Joined: Wed May 31, 2017 5:15 pm

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