Red Epic measurable resolution

[Rohan B]

Hi,i have a little question bout Red epic, what is its actual measurable resolution, as far as i know the red one mysterium version at 4k yielded 3.2k of measurable resolution and at 4.5k yielded a 3.7k measurable resolution ,and then came the red one mx which as far as i heard yielded 3.5k measurable resolution at 4k and 4.1k measurable resolution at 4.5k redcode 42, so does this means that the red epic 5k which is actualy 5.1k (5120x 2700) has a measurable resolution of 4.5 or 4.6k???
i would really like to know about this and also about whether i am right about the red one mx measurable resolutions or not....... plss reply guys

[Shane Betts]

Last time I remember Jim posting in this I think they were yielding 85% of sensor resolution, which would mean about 4.25k. At 80% (which is what I believe it was prior to Graeme's magic pixie update) the Epic would yield exactly 4k.

[Rohan B]

thanks for the reply shane......

[Graeme Nattress]

Epic is currently measuring very well on resolution, so much so, I'm having to design and produce better charts to allow me to fully measure it.

Graeme

[Rohan B]

thats great

[Rohan B]

Epic is currently measuring very well on resolution, so much so, I'm having to design and produce better charts to allow me to fully measure it.

Graeme

so does this mean that it has more than 4.35k measured resolution,i came up with 4.35k after calculating 85 percent of 5120..........

[Sanjin Jukic]

Would be interesting to know Epic resolution officially from RED even before Alan Roberts, a BBC guy can say more about it.

Below is what Alan wrote about the resolution for Sony PMW-F3:


Sensitivity was not measured directly. The specification claims it to be T/11 at ISO800,
and since ISO800 corresponds to 0dB gain, this means that the sensitivity is very similar
to that of a 3-sensor 2⁄3” sensor, which in turn implies that the pixels are about 5μm square.
Given that the sensor is ‘super 35mm’ size, it must be 24x13.5mm.
For the pixels to be 5μm spaced, the sensor width must be about 4800 pixels,
making the sensor approximately 4,800x2,700.
This fits reasonably well with the estimations in section 1.2.1,
and means that the sensor has approximately 12.9 Megapixels, typical of a digital stills camera.
It also explains why there is little or no coloured aliasing, and why the red, green and blue signals
all have the same resolution and aliasing.

LINK>>>

[Graeme Nattress]

so does this mean that it has more than 4.35k measured resolution,i came up with 4.35k after calculating 85 percent of 5120..........

What it means is that I've not finished my measurements yet, but that the initial results are very promising.

Graeme

[Lee Saxon]

So far the resolution comparison of Red One or Epic to DSLRs has focused on movie mode (finding the 5D to be 1.4K, for example).

I'd like to know how Epic compares to DSLRs in stills mode, since it's billed for that too.

Whether Epic replaces my DSLR will likely have more to do with metering and the new Nikon mount's AF performance, but it'd still be good to know.

[Dan Hudgins]

the Epic would yield exactly 4k.

Maybe, but that is only if you do your post at 5K, since you probably cannot get 4K at useful MTF from a 4K post without aliasing... That is not a problem with the camera, it a fact of any digital image.

One advantage of shooting Bayer 5K for 4K post is an improvement in the red/blue MTF and a reduction in artifacts.

One thing to look out for when doing resolution tests is a false result from the size and shape of the image spot and the lines width on the test chart, sometimes if the lens is a bit out of focus it can change the reading up rather than down, that comes from the shape of the rays being focused, and the spacing of the lines being in resonance. To avoid that you need to rack through the focus and find the focus that gives the fewest bumps in the output while still being overall high at lower frequencies, its not always easy to know if you are at maximum lens focus. Testing with more than one lens formula and at various f/ stops and averaging the results can help find the sensor/de-Bayer resolution more independent of a particular lens's issues...