Pixels vs Frame rate vs format 8k or 6k, 4K 3k

[Russ Fill]

So here's the question we all do it at some time or for any number of reasons. Use format to increase frame rate. Or just to crop.
What has a better image when your trying to achieve say 150fps on each camera Helium or Weapon Dragon?

35 and change megapixels and smaller sensor or 19 and change megapixels and larger sensor.
I know the ruff math but would like to hear from those that can do a side my side and be able to see the difference in compression. The gains and the give ups. Or maybe it's basic math.
My gut leans towards the more pixels will make up some of the sensor size loss.
On my Eeapon Dragon I did a fair amount of 3 K work at over cranked but would like to see or hear what the comparison is using the Helium at similar 150 ish frame rates and see if pixels beat larger area.

 

[Björn Benckert]

I think that if you add to the equation the fact that you can also change lenses and use lenses with a smaller projection then helium wins.

At 150fps both cameras shoot the same amount of pixels same amount of compression. The only difference then is sensor tech and projection area of the lens used.


Helium and Dragon weapon is said to have the same signal to noise ratio. Not sure that is true so only a real life test would tell who wins. I think it would be a pretty even race.


But you could put on a S16 lens on helium and get a tighter projection / sharper image and lower Fstop before you could do the same on the dragon.

 

[Russ Fill]

I

At 150fps both cameras shoot the same amount of pixels same amount of compression. The only difference then is sensor tech and projection area of the lens used.


Im not understanding how this statement is correct. Helium having 35megapix and Dragon having 19 megapixels would then the cameras respectively have.
Helium at 3k would equal 13 megapixels vs Dragon would have 9 megapixels at 3k. Or am I misunderstanding how the crop factor works with the pixels in the cameras?
Again I know the math is not exact I'm just trying to see if more pixels equal cleaner image even though the size of the sensor area would be smaller.

 

[Rakesh Malik]

The math is quite exact.

On Helium, 3K is 3072 x 1620. On Scarlet-W, 3K is 3072 x 1620.

Clearly both have the same number of pixels. The only difference is that since Helium's pixels are smaller, the area of the sensor is smaller.

 

[Hrvoje Simic]

Clearly both have the same number of pixels. The only difference is that since Helium's pixels are smaller, the area of the sensor is smaller.

So you are cropping the lens. Or zooming in the glass.



The question is more related to subjective aesthetic choice because cropped glass will soften the base resolution and act like additional OLPF.

 

[Rakesh Malik]

Cropping. Zooming changes magnification, cropping doesn't.

 

[Hrvoje Simic]

Cropping. Zooming changes magnification, cropping doesn't.

"Zooming in the glass" as a phrase for this context. Context = glass plane.
Not optically zooming in the scene. Figuratively, not literally.