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1280x512  2.5:1 ratio 23,976 fps ----------   310 frames!!! This is usable!!!
Sandisk Pro 95MB/s

here i found someting interresting it seems there is a little bit more speed possible...

http://www.traumflieger.de/desktop/kameras/testverfahren/kartentest.php

This is indeed interesting. So the fastest card for our 550D would be Sandisk Extreme 16GB 30MB/s. It squeezes out 22,6 MB/s!

Can someone explain what is the difference between 5x crop mode and normal recording? When I set a resolution without 5x crop engaged I get resolution which dont correctly relate to ratios. For instance, ratio is 16:9 and the resolution is 1216x416. And when I convert such footage it is stretched.

Thank you for the new version!
I get 1280x544 with 24 fps with Tragic RAW in 720p mode.

60 frames?

Now i'm getting stable 1280x536 (lovely 1:2.4 cinemascope ratio) at 18 fps, and with some effort and tricky twixtoring, i'm pretty sure i can shoot the whole short film entirely within the RAW workflow.

With all the fine detail, dynamic range, beautiful color reproduction and other flexibilities, we can now get a bunch of really shiny shots, guys.
Another test: https://vimeo.com/67710667

Looks great. Can you describe your workflow, please? Do you shoot in picture or movie mode, at what shutter speed and ISO? Raw2DNG to AE? When do you grade, in ACR or after you import dngs to AE?

I can not achieve good results with this. All shots that I take are with too much noise (even with ISO 100) and after I try to use noise reduction in ACR and a bit of sharpening, loaded frames in AE are still noisy. And every frame is a bit different, you can see like a noise movement all across the final render. Dont know if Im doing something wrong here. I tried both kit lense and 50mm 1.8 II.

Guys, is there any location where all the builds for 550d are located? Ive searched around for it but it seems that it isnt located anywhere on separate topic. Is it possible to update the first post in this thread with latest builds?

[Thanks to mk11174]

16fps @ 1280x640 RAW  https://vimeo.com/67514522  Thanks to mk11174!  Really quite amazing!

Beautiful shots! Shot one more, preferebly from the tripod.

Just wanted to support all the developers on this 550D port. Not everyone is capable of buying RED camera or 5DMk3, the possibility to record in such quality on our 550d is real inspiration. Thank you all!