What's your "standard" shutter speed for 24P?

Whycome Canon didn't just make a shutter speed of 1/48 with their video DSLRs? Wouldn't that be the best for 24P? 48 is what I use with cameras like the DVX100 and XHA1.
 
cap10kirk said:
Holy cow, I've been using 1/50th all this time. What about when we're using tungsten lights? Do they fall into those lights, that are bad with 1/50th? I will take the advice of using 1/60th to be on the safe side.
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Tungsten and daylight are the two light sources you never have to worry about.
 
I've seen banding when I was shooting a projection screen and did increase the shutter speed and sure enough it shows it, but I guess I've been lucky with 1/50 because I have never seen banding under flourescents and I've shot under quite a bit with them with my 7D. Must be the fluorescents in the buildings ive shot in. I do know what it looks like as my D90 definitely showed it. Very strange.

I was shooting today at 1/500 for some shots outside for effect. Very different than 1/50 that is for sure!
 
Since I use "movie lights" at 3200 K, I always use 1/50 since this is closest to what the shutter speed of movie film cameras is, 1/48 sec. Any deviation will alter the motion blurring audiences worldwide have associated and internalized as "normal" when watching 35mm films projected in a movie theater. Obviously, you can always adjust this speed for special purposes, as long as you do it knowing the effects it will have with motion blurring. I have also shot tons of film at 1/48 sec and the only time I saw any strobing was when shooting with fluorescent lights that we could not relamp. Every other light (from sodium vapors to household tungsten) never strobed under 1/48 sec. Hope this helps...
 
Film won't show the same issue as CMOS though. Film has a more global exposure, not the line-by-line exposure of CMOS, so sodium vapors will show rolling bands on CMOS whereas on film they'll look fine.
 
Barry_Green said:
Film won't show the same issue as CMOS though. Film has a more global exposure, not the line-by-line exposure of CMOS, so sodium vapors will show rolling bands on CMOS whereas on film they'll look fine.
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Well this might indicate why my 7D hasn't really shown it where my D90 did, because the D90 has WAY WORSE rolling shutter. Which then begs the question if it will be less of a problem on the GH2 and AF100 if they are indeed faster.
 
The easiest way I've found to check for banding in footage is to scrub through it in FF, Its usually too subtle to pick up in regular motion but when you're speeding through footage, you can def tell.
 
Yep, scrolling through it or playin in fast forward is an excellent way to tell if it's there or not. As will slapping on a contrast filter and exaggerating the contrast; that makes the bands easier to detect.
 
With the newest magic lantern, it's possible to shoot at wacky shutter speeds like 1/53, would this eliminate the 1/50/50hz problem or just cause more?
 
Cause more, probably. What you want to do is match the frequency of the lights, so that each cycle of the light coincides with the exposure, evenly. Using an odd shutter speed would just throw things further out of cycle.

For NTSC territories you want to stick to even divisors of 120, so 1/120, 2/120 (1/60), 3/120 (1/40), 4/120 (1/30) and 5/120 (1/24). With PAL territories you want to stick to even divisors of 100, so 1/100, 2/100 (1/50), and 4/100 (1/25). I guess maybe 3/100 would work, I don't know, if you could get 1/333333 out of the new magic lantern, maybe that would open up an option?
 
Thanks for this thread! I read loads on using 1/60 but over here in the UK I pointed at the nearest source of light I had, and had a disgusting flicker so found 1/50 or 1/100 was much better. I thought I was doing something wrong because of this haha, so thanks for putting my mind to rest with this thread.
 
I may be the only one that shoots 1/45 with dslrs. Pretty much everything on my vimeo page is shot 1/45 be it canon or gh1.

There's a tad more light and Even though the 1/50 is probably not so noticeable to most, i can see it and it bothers me.

So, I use 1/45.
 
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