True Crop Factor when shooting lower than 4k

[Francesco Cammarata]

PLS i'm interesting too.

How about AI Canon mount autofocus? one shoot or continuos in rec mode?
Can explain the different btw TI Canon mount and AI?

[Nick Wernham]

I have a feeling that many of us will be using EF lenses and probably wishing to shoot below 4k a fair amount of the time so as to take advantage of HDRx (at 24fps because, as I understand it, you cannot use HDRx at above 12fps in 4k or 15fps in 4k QHD) and/or faster frame rates. Given that, what I'd like to know is:

1) The Scarlet-X has a particular field of view with the Canon EF 24-70mm f/2.8L USM lens on it when it is set to 4k. If I set the camera to record at 2k (for example) is field of view on the lens the same or is it altered somehow? Does the zoom lens' range of potential fields of view become more akin to the Scarlet-X shooting at 4k with a 48-140mm? Is it changed in some other way?
2) I'd ask the same question when the camera is set to 3k with the same lens. Does the field of view of the lens become like shooting at 4k with a 32-93mm lens? Again, is my math funky?

[paulherrin]

http://www.reduser.net/forum/showthr...or-Demystified

[Nick Wernham]

Thank you, Paul. I hadn't seen that. Very useful post indeed.

[Paul Cook]

That is very helpful, but is that all that happens recording at those crops? The way many are talking is that In addition to turning your lens into a tele is that you loose half the light, meaning a much noisier image particularly in low light and you also have a much less shallower DOF?

[Paul Cook]

So can anyone chime in on this? Like I said I get the crop factor as illustrated by the picture above but what about the other claims of poor low light, noise and DOF ? I spoke to someone yesterday that said in many scenarios where 60p is needed you would likely get a far better image from a $5k Sony FS100 than a $16k scarlet. This scares me to say the least...

[John Byrne]

I dunno why, but I don't see much more than 1,2,3,4,5 and a Vimeo clip.... Am I missing something obvious?

http://www.reduser.net/forum/showthr...or-Demystified

[Paul Cook]

Yes you need to log in to see the picture I think

[paulherrin]

http://www.reduser.net/forum/showthr...or-Demystified

read through this thread guys...

the boxes are the area of the sensor being used to record, that's how it works. not sure where this stuff about low light, noise, and DOF are coming from. it's a really straightforward process, the camera just chooses to ignore parts of the sensor, that's it.

now, for a similar field of view (FOV), because you'll have to use a different lens, you will get depth of field differences - but that's pretty straightforward as well.

[Jiri Vrozina]

Yes, all the reduced resolution modes are cropped. That means less pixels, so also means higher fps and/or less compressed REDCODE.

Graeme

Hi Graeme,
is it possible to use EXTERNAL recorder like KiPROmini for 2k or LOWER Recording if Scarlet is set for 4K.?