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RPP Coverage Question for RED Team

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Kyle Presley

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I understand that the 50mm and up cover the full frame 35mm sensor and the 25mm and 35mm cover about 5.5K. Is the 5.5k at the 3:2 aspect or 16:9? If it is the 3:2, could the wider lenses hold up in full frame 16:9? 2.4:1? What happens at the corners, light fall off and/or loss of sharpness? Sorry for all the questions, just thinking about my options for FF35 Scarlet, it's my favorite:drool5:
 
Kyle Presley said:
I understand that the 50mm and up cover the full frame 35mm sensor and the 25mm and 35mm cover about 5.5K. Is the 5.5k at the 3:2 aspect or 16:9? If it is the 3:2, could the wider lenses hold up in full frame 16:9? 2.4:1? What happens at the corners, light fall off and/or loss of sharpness? Sorry for all the questions, just thinking about my options for FF35 Scarlet, it's my favorite:drool5:
Click to expand...

As tests will show... one of the best thing about RPPs is the way they hold resolution to the corners of a very large image circle. I need to check the charts to see just how far the image circle goes and answer your question on the wides, but you will be hard pressed to find a cinema lens that does better at 32mm image circle and above.

Jim
 
Jannard speaks the truth about their field quality.
The illumination and resolution in the field (32mm+) is one of the RPPs strong points.
This is where RPPs really shine against other pro cine lenses.
I'm sure someone at RED will correct me if I'm wrong, during testing I found these image circles for RPPs.

25mm - 34mm dia.
35mm - 36mm dia.
50mm - 41mm dia.
85mm - 43mm+dia.
100mm - 43mm+dia.
 
Matthew Duclos said:
Jannard speaks the truth about their field quality.
The illumination and resolution in the field (32mm+) is one of the RPPs strong points.
This is where RPPs really shine against other pro cine lenses.
I'm sure someone at RED will correct me if I'm wrong, during testing I found these image circles for RPPs.

25mm - 34mm dia.
35mm - 36mm dia.
50mm - 41mm dia.
85mm - 43mm+dia.
100mm - 43mm+dia.
Click to expand...

Matthew... we concur with your observation (pretty much). There just aren't too many S35 cine lenses with this kind of coverage. They will do very well using a large part of the FF35 sensor.

Jim
 
Based on the 34mm image circle of the 25mm I'm thinking you can cover a 16:9 frame at 17x30mm or a 2.35 frame @ 13.6 x 32mm. A big chunk of sensor no matter how you slice it.

*that's letting the look-around area have a bit of vignetting, which is fine with me.

Matt Uhry
www.mattuhry.com
 
Last edited:
Matthew Duclos said:
"pretty much"
Please elaborate. ;)
Click to expand...

Rough science (depends on what light falloff is acceptable)
You posted whole numbers (which is perfectly fine).

=

Pretty much... :-) No disagreement.

Jim
 
Jannard said:
Rough science (depends on what light falloff is acceptable)
Jim
Click to expand...

To be totally honest, that's the impressive part of the RPPs. There is no light falloff.
It's either illuminated or not. Like I said, RPPs display even illumination throughout the image circle.
 
I am not a DOP so if this does not make sense please say.
Just wondering Is it possible to have a max sensor coverage setting for RED S35 lenses on the FF35;
Obviously their would be a different setting for each lens, depending on the prime in use, may prevent some nasty surprises and mistakes when the FF35 arrives.
 
Evin Grant said:
Well the 50, 85 and 100mm RPPs do cover full frame 35. The 25 and 35mm cover a bit more than S35 but probably not enough to be worth the effort in making custom frame sizes.
Click to expand...

In that case, the 50mm will actually be wider than the 35mm. (When the 35mm is used on FF35 sensor, cropped to S35... while the 50 gives full coverage...) (Or something.)

What image circle is needed to cover FF35 @ 16:9? (Which I guess is approx 36x20mm(?))
 
Nils J. Nesse said:
In that case, the 50mm will actually be wider than the 35mm. (When the 35mm is used on FF35 sensor, cropped to S35... while the 50 gives full coverage...) (Or something.)

What image circle is needed to cover FF35 @ 16:9? (Which I guess is approx 36x20mm(?))
Click to expand...

Very interesting question! Nobody have an answer for that?

Andrea
 
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