#setlights

[esem1994]

# Cinematography

# Flicker free equation

There are two ways to deal with pulsating light sources, magic frame rates, or magic shutter angles. If you pick a magic frame rate, you can use whatever shutter angle you want to get the motion blur and exposure you want. If you have to use a non-magic frame rate, you're stuck to pick one of the shutter angles that are "magic" for that frame rate.

Light sources that pulsate due to AC power produce light on both the positive and negative half cycles, so they pulsate at twice the power frequency, 100 Hz in the UK, 120 Hz here in the US. Your goal is to get the same amount of light in every frame.

 The first way to do that is to choose a frame rate that divides evenly into the pulse rate. That way each complete exposure and pulldown cycle of the camera corresponds to an integer number of light pulses. So, the shutter always opens at the same point in the light pulse cycle, and closes after admitting the same amount of light. That allows you to use any shutter angle you want. 24 works here, because 120 = 5 x 24. 25 works there, because 100 = 4 x 25.

For over or under cranking, the possibilities are:

120 = 1 x 120 = 2 x 60 = 3 x 40 = 4 x 30 = 5 x 24 = 6 x 20 = 7 x 17.143 = 8 x 15 = 9 x 13.333 = 10 x 12 .... = 20 x 6, etc.

If you can't use one of the magic frame rates, you're stuck with the more difficult approach. You have to find the shutter angles that, at the required frame rate, have the shutter open for an integer number of light pulses. Suppose you must use 25 fps with 120 light pulses per second. In that case, you want a shutter angle A such that

(1/25) x (A/360) = (N/120) where N is an integer. The possible N values are 1, 2 ,3, and 4, because at N = 5, the exposure becomes longer than the cycle time, so your shutter angle would have to be over 360 degrees. Working the math, we get:

A = 75 x N

So, the possible angles are 75, 150, 225, and 300. (The next one would be 375, but that's impossible.)

It should be clear that magic frame rates are the easy way, and 24 is plenty close enough to 25.

If you have some reasonable way of recording and monitoring what you shoot, you should be able to test and play back on the set to be sure if you have a problem. A great many light sources such as incandescents and modern flourescents don't follow the mains frequency, and work fine without any extra math or magic. I've seen problems with neon signs and advertising displays, though. Particularly, some of the LED chasers use their own frequencies, so you may have to experiment with them, or just get them off the set.

( Copied from John Sprung's post ) .

[corpusupir]

#day17 done run and full body #workout . It was a hard one as my knee went out , but I pushed through. Oh and the light are setup right thanks to my buddy Erik! #setlights #metalasmedicine (at Kelowna, British Columbia) https://www.instagram.com/p/B1vOSU2BWaS/?igshid=1vowg4eif6w08

[art-freak1]

Long Take Workshop. (3/3) Swipe 👉🏻 to see the Before and After of the Colour Grading process! . . . . . Shot on Sony FS7 in SLog-2. Graded on DaVinci Resolve 17. #colorcorrection #colorgrading #visualart #colorist #DaVinciResolve #setlife #setlighting #filmmaking #filmmaker #grainisgood #grading #visualarts #agameoftones #hues #yellowandblue #moodygrams #moodytones #aesthetic #filmgrain #sonyfs7 (at Whistling Woods International) https://www.instagram.com/p/CVHuC1pAOGf/?utm_medium=tumblr

[dixiecotton]

Repost from @crzystudiolighting • Behind the scenes of the content shoot for #TheBatman with @entertainmentweekly and @gizellehernandez ft. Robert Pattinson and Zoë Kravitz Check out our stories for the final results! @creamsource Vortex 8's, @arri Skypanels, @hudson.spider Mozzie and Redbacks, @litegear Litemat 4 & 2 Spectrums, @electronictheatrecontrols Source 4s, and @asteraofficial Titans all in play 💡💡 #onset #setlighting #behindthescenes #filmmaking https://www.instagram.com/p/CaD2FOHMJAr/?utm_medium=tumblr

[indiejonesjr-blog]

It’s been a blast to grip/gaff/AC ‘The Experience’. I’ve definitely learned a lot (as always) and I look forward to how many people this show will touch and reach. To see more visit Discovery’s website at: https://www.discovery.com/tv-shows/the-experience/ And @westonandjodi ‘s IG page 👈🏼 - - #filmmaking #film #video #filmproduction #onset #behindthescenes #filmincolorado #filminco #coloradosprings #colorado #television #tvshow #televisionshow #hmi #setlighting #setlights #1200 #theexperience #reddigitalcinema #redcamera #accessmediagroup #blue #setlife #gaffer #gafferlife #grip #griplife #life #love #all (at Boot Barn Hall) https://www.instagram.com/p/BvKO6oan3c2/?utm_source=ig_tumblr_share&igshid=1xf17gb6ydwa5

[osamaqadeer101-blog]

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A post shared by Osama Qadeer (@osamaqadeer101)

Repost,By @osamaqadeer101 - 🎥🎬 look with different lenses from 20-200mm. What is your favorite focal length ?❤️ 🎬 🎥 . . . . . . . . . #filmgear #setlife #onset #shortfilmdirector #cameralens #videoeditor #cameraoperator #samsfilmaking #cameraman  #lightingsetup #wegoatpk #setlighting #artbyosamaqadeer #setlife 🎥🎬 #onset #directorofphotography #filmdirector #artdirection #filmset #filmmakerslife #filmmakers #videographer #videography #videomakers #filmdirector #directorslife #directores #canonlens #sonyalpa #filmindustry https://www.instagram.com/p/CU-cDscjsuY/?utm_medium=tumblr

[aristidesrubio]

[jmberrios]

Been a minute but somebody has to do it. ⚡️💡🎥 #flying #setlife #condor #electric #electrician #lighting #m90 #18k @arri #setlighting #tv #filmmaking (at Charleston, South Carolina) https://www.instagram.com/p/Bx710M6jld3/?igshid=1f92rpggeabku

[zebracloak]

Great BTS photo by @almariec from a recent music video project. #KeyGrip #gripandelectric #setlife🎥 #setlighting #zzge https://www.instagram.com/p/Bv2EowvhcZ_/?utm_source=ig_tumblr_share&igshid=w528x9tlry6

[actorakhi]

इक रात वो गया था जहाँ बात रोक के अब तक रुका हुआ हूँ वहीं रात रोक के اک رات وہ گیا تھا جہاں بات روک کے اب تک رکا ہوا ہوں وہیں رات روک کے ~ फ़रहत एहसास . . . . . . . . . . . . . . . . . . . . . . . . . . . . #lucknow #vaikhariyawalikar #indiapictures #filmmaker #cameradept #productionlife #setlighting #filmcrew #cinemalover #bombaytimesfashionweek #mumbai #bombay #writerslife #filmscreening #bollywood #actorlife #actorsofinstagram #movieactor #bollywoodactor #castingdirector #contemporaryphotography #indianactor (at Actor) https://www.instagram.com/p/CqAZGVKyTOw/?igshid=NGJjMDIxMWI=

[rowanfilms]

Ask me a question about this green screen setup. 🤗 * * * #greenscreen #gafferlighting #gaffer #setlife #setlighting #videographytips #videography https://www.instagram.com/p/Cnm6h4UPENz/?igshid=NGJjMDIxMWI=

[moderntumbler]

Posted @withregram • @southerngrip In the studio last week with DP @pellucid3000 and @cropcreativemedia We built out the 20x softbox rig with chroma q space force lights and skinned with bleach muslin. We put a few chain motors in the mix for safety and efficiency. Arri skypanel s60’s and 120’s for cyc lights and 2 camera cross keys with the s360 and Hudson spider on the ground for the big softy, key light. Cintennas made it all possible to dial in quick and easy. Nice to be working at home! Great job Killer crew . . . . #lightingandgrip #gripandlighting #filmlights #filmlighting #studiolighting #inthestudio #studiorigging #griprigstuff #griprigs #gripdept #setlighting #setlife #onset #southerngrips #localfilm #filminflorida #filminjacksonville #lightingdept #ledlighting #bts #behindthescenes #getagrip https://www.instagram.com/p/CiEO_XbvSmY/?igshid=NGJjMDIxMWI=

[art-freak1]

Set lighting at Mise-en-scène Workshop. (3/3) . Lighting designed by: @adityamathur01 @toshik.saraf @vanshikagarg31 @the.film.freak . . . . . #moodytones #setlighting #monochrome #warmtones #silhouette #silhouettephotography #setlife #filmmaking #miseenscene #agameoftones #moodyports #moodygrams #art #shadow #lightsandshadows #contrast #aesthetic #visualambassadors #visualart #vsco #vscomag #shotoniphone #gaffer (at Whistling Woods International) https://www.instagram.com/p/CUHdAL8pW1-/?utm_medium=tumblr

[studiohire]

BTS of some shoots we have done at our studio . ———————————— FOLLOW: @cineviewstudios VISIT: www.cineviewstudios.com ———————————— . *** #studiohire #london #videoshoot #bts #filmstudio #studiolife #setlighting #film #videography #filmset (at London, Unιted Kingdom) https://www.instagram.com/p/CdXr3EcIC42/?igshid=NGJjMDIxMWI=

[fluotec]

Posted @withregram • @iclsociety The International Cinema Lighting Society is a global group of cinematic lighting professionals dedicated to expanding the field of cinematic lighting. We seek to build our collective knowledge base, connect lighting communities around the world, and work towards intersectional gender parity in the set lighting department. If you’re interested in joining you can follow the link in our bio (applications are found in the Programs part of our website) or send us an email at info@iclsociety.com #setlighting #gaffer #rigginggaffer #lightingconsoleprogrammer https://www.instagram.com/p/CYJMUWwrj3i/?utm_medium=tumblr

[houseacuity]

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