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Couple questions about DSLR's

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[J_Gasper]
Posts: 2983 - Karma: 1,594
Hey guys,
I have a few questions that I need answered. I would really appreciate it if you gave your input.

1. Whats the different between shooting RAW and JPEG? They are the setting right above the frame rate settings on the canon DSLR's. I have never really known what the difference was. Which one should I be filming with?

2. Is there any trick to making your footage less noisy when shooting with a high ISO? It seems like when shooting urban in a confined space with 3000w of lights and Im still having to crank my ISO up to 3200. I mean its not noisy to the point where its unusable, but just wondering if there is a way around going so high.


3. What is aliasing/moire? I have done some research on google and I really dont understand it. Does anyone have any examples in ski shots? I shoot 720 60p, is it better or worse at that resolution?


Thanks guys!

+K for help
Dec 18 2011 8:54PM
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eheath
Posts: 61603 - Karma: 123,098
1. RAW image is an uncompressed image that is fantastic for editing. Pretty much any decent photog will shoot RAW except in certain circumstances. RAW is very flexiable in post, you can do alot to your image and it doesn't degrade it. JPEG is compressed and is harder to edit in post the file sizes are smaller and you can take more pictures in a row without buffering.

2. I think the only way to do this is to use flashes and/or get a faster lens. Not much you can do about noise in post with out some heavy editing. Much easier to use a flash and have a faster lens.

3. Moire is an effect that happens when there is too much detail in the image and the sensor can't read it properly. The effect you see are rainbow colored bands that will move when the shot moves, creating a very ugly image. Aliasing is when the camera sensor can't read certain details and it attempts to fill it in digitally, creating odd edges and details that are quite ugly too. Its hard to prevent these things with a dslr, best thing to do is avoid highly detailed subjects like brick walls or shingles on roofs, especially from a distance. Doesn't matter what resolution or frame rate you are recording.
Dec 18 2011 8:59PM
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[J_Gasper]
Posts: 2983 - Karma: 1,594
alright thanks, its a lot clearer now. so you recommend shooting RAW for video to? does it even apply for video?
Dec 18 2011 9:03PM
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eheath
Posts: 61603 - Karma: 123,098
RAW does not apply to video, that's why people buy RED's, they shoot in a RAW format similar to photos on a dslr. at 4k/5k a RED's still frame is basically a DSLR picture. Its crazy shit man.
Dec 18 2011 9:05PM
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[J_Gasper]
Posts: 2983 - Karma: 1,594
ah okay, that's why I was kind of confused. I heard people talking about filming RAW, and it also kinda confused me because its in the video settings for my t3i. so that whole list where gives me JPEG, JPEG+ RAW, and RAW itself means absolutely nothing towards my video image?
Dec 18 2011 9:07PM
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eheath
Posts: 61603 - Karma: 123,098
Yes, thats all photo stuff.
Dec 18 2011 9:12PM
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[J_Gasper]
Posts: 2983 - Karma: 1,594
damn, okay. thanks for the help.
Dec 18 2011 9:13PM
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the.cheat
Posts: 2859 - Karma: 171
i always shoot raw unless i don't care about whatever i'm shooting at the time and i'm just humoring someone, i switch to jpg to save space. also if i'm gonna be bursting a ton it can't keep up so i switch over.
Dec 18 2011 9:38PM
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[J_Gasper]
Posts: 2983 - Karma: 1,594
sorry, forgot to ask. i know the fs100 shoots uncompressed 4:2:2, and the scarlet and epic shoot uncompressed RAW, so wouldnt the workflow pretty much be the same? like as in grading being the same?
Dec 18 2011 9:53PM
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Mkvackay
Posts: 1903 - Karma: 5,465
i would ultimately like to shoot everything raw, including timelapses, but raw takes up an enormous amount of memory per photo
Dec 18 2011 9:55PM
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[J_Gasper]
Posts: 2983 - Karma: 1,594
can it keep up with 2 photos per second?
Dec 18 2011 9:56PM
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Mkvackay
Posts: 1903 - Karma: 5,465
you mean a photo every 2 seconds, and yes.

with my 16gb pro extreme, raw lets me take about 600 photos. not quite enough if im looking for a day timelapse, although i usually only take ~300 with stars
Dec 18 2011 9:59PM
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[J_Gasper]
Posts: 2983 - Karma: 1,594
haha yeah, sorry, long day on the mountain.

thats pretty solid. most of the timelapses I do require a lot more photos unfortunatley. never really play'd around with RAW, gotta try that tonight when I go out!
Dec 18 2011 10:02PM
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eheath
Posts: 61603 - Karma: 123,098
It CAN do 422 to an external recorder, but thats a $2k add on. I shoot avchd, 420 codec at around 28mbps. Its better than a dslr h264 codec, but its no where near a RED.
Dec 18 2011 10:12PM
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[J_Gasper]
Posts: 2983 - Karma: 1,594
yeah okay. is 420 codec compressed?
Dec 18 2011 10:15PM
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eheath
Posts: 61603 - Karma: 123,098
Yes, dslrs h264 codec is 420. 422 and 420 are refering to color space. RAW color space is 444. Read this if you have a minute and want to learn more about color space http://dvxuser.com/articles/colorspace/
Dec 18 2011 10:23PM
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[J_Gasper]
Posts: 2983 - Karma: 1,594
ohh okay. thanks a lot!
Dec 18 2011 10:24PM
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