Lens question (Full-frame?)

[Luke Holwerda]

I apologize if this is a completely amateur question to ask. Feel free to laugh and point you finger... but only if you actually answer the question.

I'm new to the RED... but I have a background in digital still photography. I shoot currently with the Canon 5D MkII. And while recently on set with the RED and the 5D side-by-side, I noticed the RED lens appears to be cropped... by the sensor I'm presuming.

We have the 18-50mm "Generation 1" lens.

18mm on the RED lens is not equivalent to the 18mm on the 5D. It actually looks closer to 28mm. Is there something I'm missing, or is the RED not actually a "full-frame" sensor like the 5D?

Is there anyway to get wider with this lens?

 

[Tim Hole]

No. The RED is S35 which is a cinema standard that matches cinema standard lenses. The 5D, I believe, is a full frame camera in stills but does not use the entire sensor for motion it crops for a 16:9 aspect ratio which is TV standard. So neither are full frame in motion.

 

[Jacek Zakowicz]

crop ratio

crop ratio

5D2 sensor is 43mm diagonal and Red M is 28mm so the crop factor is 43/28=1.54

 

[Ketch Rossi]

It actually was my understanding that the Crop on R1 MX was 1.3 same as form my to my 1D III vs. my 1Ds III (same FF size sensor as in the 5D II).

 

[Luke Holwerda]

Thanks guys. That clears that up.

Tim, you're right... I wasn't thinking about the aspect ratio... it does cut off the top and bottom... but the width is still ridiculous. I'm going to try mixing in a 5D shot every once in a while in the film. But I'm really skeptical as to how will the 2 will play together in the end. Those shots may never make it in.

 

[Tim Hole]

It has been done many times before so its far from impossible.

 

[Mitch Gross]

This chart may be of use to you.

http://blog.abelcine.com/2010/08/18/35mm-digital-sensor-comparison-chart/


We also created a handy calculator to compare relative focal lengths.

http://blog.abelcine.com/2010/09/29/field-of-view-comparator/

 

[Tim Hole]

Thanks Mitch, nice visual reference.

 

[ericyoung]

Very useful stuff! Thanks Mitch!

 

[Luke Holwerda]

Thanks Mitch, and all.