Difference between 4k and 5k on lenses

[Chris Gavrilovic]

I have been reading on these forums that the Canon EF-S 17-55mm lens vignettes on the EPIC when shot at 5K, but will not at 4k. Assuming the same will happen on the SCARLET, I am curious as to why this happens?

Can someone please explain to me the technical reasons that at 5k this lens vignettes but not at 4k?

Thank you

 

[Mohamed Younis]

Very simple. The 5k frame is larger so the vignetting is visible. 4k is cropped that's why the vignetting is invisible. I saw this posted a few days ago. I hope it helps you understand

There's been a lot of confusion and misunderstanding about the crop factor for the Epic/Scarlet, so here's the skinny. Explanations after Examples.

5k

4k

3k

2k

1k

Actually, do we need a complicated explanation? There it is, that's what you get. Choose your lenses, framerates, and compression ratios accordingly. When you shoot these resolutions, you get these crops because the sensor "windows" down and disregards the surrounding area. That's how you get your higher framerates and compression ratios. Any questions?

Good, now here's what you can do with 5k footage on the web...

UPDATE: Below is a collection of charts and resources from others. Thanks guys, useful stuff.

Jesper Sichlau:
(as compared to FF35)

http://www.abelcine.com/fov/




Keep reading through this thread and you'll be fully equipped and ready to go. Just keep shooting and make some beautiful, challenging imagery. Don't worry too much about this stuff, just be aware.

 

[Chris Gavrilovic]

I greatly appreciate the thorough explanation.

Very simple. The 5k frame is larger so the vignetting is visible. 4k is cropped that's why the vignetting is invisible. I saw this posted a few days ago. I hope it helps you understand

 

[Chris Gavrilovic]

So if RED came out with a 6k camera tomorrow, vignetting would be especially bad because these lenses are designed with those sensor sizes in mind, yes?

 

[Luis Castaneda]

So if RED came out with a 6k camera tomorrow, vignetting would be especially bad because these lenses are designed with those sensor sizes in mind, yes?

Well, technically a larger sensor isn't necessary for higher resolutions. So 6K is achievable on the same size sensor. But judging from Red's trends, any future higher rez cameras will likely have a larger sensor.

 

[Häakon]

So if RED came out with a 6k camera tomorrow, vignetting would be especially bad because these lenses are designed with those sensor sizes in mind, yes?

Luis is right, it's not the resolution that's important, it's the sensor size. Your concern is valid, however, as the sensor many see as a logical "next step" is a Full Frame 35 sensor, which many PL lenses will not cover. You would need still lenses, or something like Zeiss' compact primes in order to "future proof" yourself for that scenario. And of course, one could make a sensor even larger than those lenses would cover (though in the realm of affordable motion picture production, that's likely a ways off...)