Using video with the 7D

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bchamberlain
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Using video with the 7D

#1 Post by bchamberlain » Wed Jan 16, 2013 8:38 pm

After my first attempt last Saturday with the camera attached to the eyepiece, the results were encouraging but far from satisfactory. After a really interesting and informative chat on Tuesday evening, I'd like a recap on some of the things we discussed re using video. My 7D came with Zoombrowser EX. If I use the video function, is this the program which will extract single frames? I have a choice of frame rates 60, 50 30, 25 & 24. Resolution 1920 x 1080 - 1280 x 720 and 640 x 480. Which is best. Also after Saturday's effort, I tried a program called Deep sky Stacker without success though admittedly without wading through the readme as I should. I'd appreciate any advice as experimenting on freezing nights isn't for me. Bill C

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Re: Using video with the 7D

#2 Post by DRatledge » Wed Jan 16, 2013 9:23 pm

Bill,
All the Canon's seem to have different video modes - nothing is standard. With your camera there are two ways to go. The good news is that the performance exceeds that of the webcams and approaches that of specialist planetary cameras.

1. Use the Canon video mode to record a movie. This saves direct to the camera's memory card so is very fast. Frame rates can be 60fps which is good. More images to choose from. For the planets the 640x480 is likely to be the best as this will probably be one pixel to one pixel ie no resampling which is what you want. The other modes should be best for the Moon. The bad news is that the videos are in MOV format which Registax and most others don't (yet) support. So having collected a MOV with thousands of frames you have to convert them which can destroy quality. The solution is lossless convertors but expext massive files after conversion with these.

2. Use Live View and connect your camera to a computer. This displays the live view stream. Canon doesn't provide live view capture (just display) so third party software like EOS Video Recorder is needed - this is freeware. This produces avi files that Registax6 can open and use. Frame rates will be lower but probably around 30fps. To get one pixel to one pixel you have to set the magnification in EOS Video Recorder to 5x with most Canons but perhaps 10x with your 7D. Also there are 2 live view modes - default is auto exposure - you need the second option which allows manual setting (in EOS Movie Recorder) of the exposure.

So that is the choice - 1 is better but a lot more hassle, 2 is not quite as good, needs a computer but is easy.
With Jupiter you are limited to around 200 seconds but even at 30fps you will have more than enough frames for Registax to produce a great image. It aligns the images, selects the best, stacks then sharpens. A focal length of about 4000mm is about optimum for the planets with your small pixels - shorter is OK for the Moon..

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Re: Using video with the 7D

#3 Post by bchamberlain » Wed Jan 16, 2013 11:26 pm

Thanks for that David.Plenty to go at there.I think there'll be time for a bit of daytime practice before the next clear night. Bill

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