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lenses PL mount sensor ARRI canon c300

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#1 panagiotis agapitou

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Posted 19 October 2017 - 04:00 PM

Hello 

 

Sorry if it's a silly question but i'm new to all that ... 

 

These lenses from this RENTAL STORE  are made for 35mm Film cameras ... right ?? (ARRI Master Prime ZEISS T 1,3 ZEISS T 2.1Cooke S4Cooke Zoom 20-100mmUltra Prime)  

 

And also are compatible with Cine PL digital cameras like ALEXA, RED, Canon EOS C300PL etc ... Right ?? 

 

But according to this chart ... If I want to use a 18mm lens in the way Kubrick it .. it's impossible with the Digital cameras ..  Right ?? 

 

And the CLOSEST to that is Canon C300 with 99%  !! Right ??  

 

So the Canon C300 is better on that point than the high end ALEXA and AMIRA  ?!?! 

 

And what is the solution to achieve an 100% result ??? 

 

Thank you !!

 

35mm_DigitalSensors_13.jpg


Edited by panagiotis agapitou, 19 October 2017 - 04:01 PM.

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#2 Dom Jaeger

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Posted 19 October 2017 - 07:57 PM

Yes, those lenses are all cine lenses designed for S35 format, and they will work on digital cameras with S35 sized sensors. (The Cooke zoom is older but still just covers most S35 aspect ratios.)

 

Those percentages are just telling you how big the 16:9 sensor area is on various digital cameras compared to a S35 3 perf 16:9 frame. Most lenses made for S35 will cover at least a 30mm diagonal frame (see the image circle diameters needed for each camera in the circles next to the frames), often more. There are a few image circle databases around to give you a sense of how big a frame a lens will cover. There are new cameras around since that Abel Cine guide was made, like the Red Dragon, which have oversized sensors that are more problematic for some S35 lenses.

 

A slightly smaller sensor will result in a slightly smaller field of view, a slightly larger sensor will give a slightly larger field of view, but as long as the image circle created by a lens covers the sensor you don't need to worry about those pecentages. It's just a guide to get a sense of the differences in field of view on different cameras.


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#3 David Mullen ASC

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Posted 19 October 2017 - 09:30 PM

Keep in mind that Kubrick used the 18mm on standard 35mm, not Super-35 (21mm width, not 24mm width) so in that sense, the cameras listed as being around 90% of Super-35 are closer to the field of view that Kubrick got with an 18mm.  But that's being pretty nitpicky.


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#4 David Mullen ASC

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Posted 19 October 2017 - 09:45 PM

Just comparing horizontal view, Kubrick's movies when projected in 35mm had an aperture width of 20.96mm, whether projected in Academy, 1.66, or 1.85.

 

So if 16x9 1080P on an Alexa uses a sensor width of 23.8mm, then an 18mm lens will have a wider field of view than it would for Kubrick.  Divide 23.8 by 20.96 and you get a 1.1355X crop factor or conversion factor.  So you'd have to use a 20.44m lens on an Alexa to match the view of an 18mm lens on a standard 35mm camera (not Super-35).

 

I wouldn't get worked up though about this small difference in field of view, not many people watching the image on the big screen are going to realize that the 18mm on the Alexa is giving a slightly wider view than it would on standard 35mm.

 

Truth is that they are using the largest possible dimensions for Super-35, 24.9mm (which they call "100%"), and compared to 20.96mm for projected standard 35mm, you'd have to use a camera listed as 84% on their chart to get closest to the view that Kubrick got when shooting!

 

Achieving "100%" is a somewhat meaningless goal.


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#5 panagiotis agapitou

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Posted 20 October 2017 - 08:20 AM

Thanks for your great answers !! I got it ... 

 

I have also another question .. what happens if i don't use Alexa's 1080p but i go with ALEXA mini on 4K UHD ?? 

 

Thanks again !!!     


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#6 David Mullen ASC

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Posted 20 October 2017 - 11:03 AM

If you're talking about field of view of lenses, the Alexa normally uses a 2.8K area for most recordings like 2K ProRes, 1080P, etc. but can use a 3.2K area for 3.2K ProRes or 3.8K (UHD) ProRes.  The max size recordable sensor area is 3.4K "Open Gate" in ARRIRAW.

 

2.8K is similar to Super-35 but beyond that, you get into slightly larger areas for 3.2K and 3.4K.

ALEXA_Classic_Recording_Areas-Surround_V


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