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Canon EOS C70 Lab Check with the RAW replace: Rolling Shutter, Dynamic Vary and Latitude


Canon EOS C70 Lab Test with the RAW update: Rolling Shutter, Dynamic Range and Latitude

With a current firmware replace in March, the Canon EOS C70 can now shoot in Cinema RAW Gentle LT. The Canon EOS C70 shares the identical twin achieve output sensor (DGO) because the Canon EOS C300 Mark III that we examined right here. Curious to listen to the way it performs? Then learn on …

The Canon EOS C70 was launched some time again, in September 2020 to be exact, and through the years it has seen quite a few firmware updates, it has been accepted by Netflix, and naturally it has acquired the FilmConvert therapy. In March 2022, it obtained one other main firmware improve that now permits the EOS C70 to report Cinema RAW Gentle LT internally. Now it’s time to place this little movie digicam by way of our lab take a look at! So let’s have a look.

Canon EOS C70
Canon EOS C70 within the CineD Lab.

Rolling Shutter of the Canon EOS C70

As talked about above, the Canon EOS C70 and C300 Mark III share the identical DGO Sensor, therefore the rolling shutter values are precisely the identical, 15.6ms for 4K DCI (17:9):

Canon EOS C70 rolling shutter: 15.6ms

This rolling shutter worth applies from 25 – 60 frames per second. As soon as we shift the sensor to 75 – 120 fps, the twin achieve output shouldn’t be energetic any extra and the rolling shutter drops to 7.7ms.

Dynamic Vary of the Canon EOS C70 at ISO800

If you’re not acquainted with how we take a look at the dynamic vary of cameras, please take a look right here.

Let’s take a look first on the new Cinema RAW Gentle LT mode in 4K DCI at ISO800. When creating the RAW information to Canon Log2 in Davinci Resolve we acquire the next waveform:

Canon EOS C70
Waveform plot of the Xyla 21 chart for the C70 RAW information developed to C-Log2

About 13 stops may be recognized above the noise flooring, in addition to a 14th and a faint fifteenth. That may be a actually good consequence, confirmed by IMATEST:

IMATEST consequence for the Canon EOS C70 utilizing Cinema RAW Gentle LT

IMATEST exhibits 12.3 stops at a sign to noise ratio of two (SNR), and 14 stops at SNR = 1. Additionally, within the center graph above the blue “14” line about 3 further stops are exhibited. Wow!

In XF-AVC Intra C-Log 2 (as much as 60 frames per second, twin achieve output energetic), extra inner noise processing appears to occur, because the waveform plot exhibits much less noise:

Waveform plot of the Xyla21 chart utilizing XF-AVC Intra C-Log 2with the C70

13 stops are once more seen.

Canon EOS C70
IMATEST for the C70 utilizing XF-AVC Intra C-Log 2 (DGO energetic)

IMATEST calculates 12.8 stops at SNR = 2 and 14.2 stops at SNR = 1. Very spectacular, and precisely the identical consequence that we measured for the C300 Mark III right here.

In XF-AVC Lengthy GOP C-Log 2 (from 60-120 frames per second) the twin achieve output shouldn’t be energetic and we unfastened about 1 cease:

Waveform plot of the Xyla21 chart utilizing body charges > 60 fps with the C70 (C-Log 2)
IMATEST for the C70 utilizing XF-AVC >60 fps (DGO inactive)

Apparently, once you take a look at the decrease graph above I made a circle across the darker stops near the noise flooring – evaluating this space with the IMATEST graph when DGO is energetic, you’ll be able to clearly see how DGO lowers the noise within the darker stops (therefore provides greater dynamic vary).

Latitude Check of the Canon EOS C70

As talked about in earlier articles, latitude is the potential of a digicam to retain colours and particulars when over / underexposed and pushed again to a base reference stage.

For our CineD studio exams the bottom publicity stage refers to a waveform worth of 60% on the brow of our topic Johnnie (utilizing Cinema RAW Gentle LT at ISO800, developed to C-Log2 in Resolve):

From right here we begin to overexpose till the crimson channel is on the cusp of clipping on Johnnie’s brow:

Canon EOS C70
Canon EOS C70
RGB waveform for the (ungraded) 4 stops over studio scene – the crimson channel is near clipping.

From right here, we underexpose the scene successively, till we attain 3 stops under base publicity, pushed again (3 stops can nonetheless conveniently be adjusted within the digicam uncooked tab utilizing the publicity slider in DaVinci Resolve – above that, the raise, gamma & achieve controls are used):

At 3 stops below, noise begins to kick in. It’s finely dispersed and appears relatively good, so no want for noise discount for my part.

At 4 stops below, pushed again noise turns into very dominant, and a slight greenish tint in addition to bigger vertical greenish / pink areas seem:

Canon EOS C70

Utilizing noise discount in DaVinci Resolve, the picture may be cleaned up properly – see additionally the settings depicted under:

Canon EOS C70

Now, as we now have reached already 8 stops of publicity latitude – the utmost we now have seen up to now with all cameras within the lab with one exception, the Arri ALEXA Mini LF (having 10 stops of publicity latitude), I used to be very curious to see if 5 stops below, pushed again would nonetheless be OK:

Sadly, noise turns into atrocious, and colours begin to fade to brownish / greenish solid. Additionally, the bigger vertical bands of inexperienced and pinkish areas are very apparent. Sadly, even large noise discount can not save this picture and it’s “sport over”:

Canon EOS C70

That will have been 9 stops of latitude. The picture nonetheless seems to be surprisingly OK in comparison with different cameras – however to me it’s not actually usable any extra.

Abstract

The Canon EOS C70 with the current Cinema RAW Gentle LT improve performs very effectively in our lab: rolling shutter values are fairly good (DGO energetic) to excellent (DGO inactive), the dynamic vary with 12.3 stops at SNR = 2 for RAW and 12.8 stops for XF-AVC Intra are second greatest we now have ever measured up to now for a Tremendous 35 sensor. The benchmark for Tremendous 35 stays the ARRI Alexa traditional with 13.8 stops at SNR = 2 (lab take a look at right here).

Within the latitude take a look at the outcomes are comparable: 8 stops of publicity latitude in our normal CineD Studio scene is on par with even the most effective full body cameras. With the benchmark once more being the Arri ALEXA Mini LF exhibiting 10 stops of latitude (5 stops over, 5 stops below).

Hyperlink: Canon

Have you ever shot with the Cinema RAW Gentle LT improve of the C70 but? What are your experiences? Tell us within the feedback under …



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