Avoiding flickering at 500 of the second

K

kyriakides

Member
I have changed my setting to 24p of my European 25p Pal Panasonic AF101.
I like to try the 1/500 shutter speed but I saw flickering when lamps are on at interior. Can you tell me if there is any way to avoid that. That has something to do with the synchro scan?
Thanking you in advance.

Costas
 
Jassou Rolf,

I would like to keep my frames to 24p because of the film I am going to do should be transfer to DCP for theatrical viewing and because the most projectors now days are made for 24p I thought to change to 24p instead 25p.
Why 1/500 of the second? We should try it and see the difference. Someone is using his AF101 with that speed. Maybe it is steadier?

Costas
 
Thanks David,

I have read that before. But what about the projectors which support only 24p. They will not change them in a night. But maybe I am wrong. Do you know anything about it?
 
Almost all projections are in 24p this moment as I heard. That is because the films for cinema was done the old days and still now in 24p.
 
No disrespect, but how do you know your film is going to to receive theatrical release?

Also, have you thought about shooting 25p then a 4% slow down if needed?

It's been a while since I investigated digital projection, but from memory they can run at different industry standard frame rates.
 
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Hi David,
My last short had one why not the next one. I want to believe that I can reach this again and again. But our minister of culture will have a copy of my film in DCP if they decide is good enough to start it and that it is already written in my application 26-10-2011 this year.
I hope I don't seem very expert at those subjects because I am not. That is why am asking all those questions here. I am very happy to belong here and get all information and I respect each answer from you all so far.
 
What frame rate did you shoot your last film at?

Also you might want to take my advice and call some theaters. You just may be surprised!
 
My Last shot on 25p 1920x816 and they got it as mp4. The camera I use could do 24p but I thought to set it in 25p for the TV as well.
Now because of the DCP promise to minister of culture here in Cyprus instead of negative print I thought I need to work at 24p for DCP. But anyone here knows anything about Europes theatres what they are using mostly will be welcome to hear.
 
kyriakides said:
I would like to keep my frames to 24p because of the film I am going to do should be transfer to DCP for theatrical viewing and because the most projectors now days are made for 24p I thought to change to 24p instead 25p.
Why 1/500 of the second? We should try it and see the difference. Someone is using his AF101 with that speed. Maybe it is steadier?
Click to expand...

No - it's not "steadier" it will instead make movements harsher, like a strobe effect (sorry, don't have the english expression at hand right now ;-)) because you will lose motion blur. You'd want to shoot only if this is exactly the effect you want to create, if you have enough light and ... obviously ... if you are in-sync with the electrical grid.

Whenever you are on 25 p in a 50Hz grid frequency country (like Greece is to my knowledge), you will be in sync with the grid frequencies (same applies to 50p) and will only run into problems, when the lighting equipment is not in sync .... or if you shorten exposure time too much and phase shifting appears.

Now: You can shoot 24 p in a 50Hz country - but then you have to stick with certain exposure times or certain shutter angles. Try to read up on the links I gave you and work with the flicker calculator. But you maybe make things more complicated while you are on the shoot.

But - honestly: Try to check if it would not be the easier way, to shoot and edit in 25p and then change the film to 24p. I believe there are solutions around that do that for you even without frequency and time change - but I am not sure, because I have never transferred material to 24p.
 
Thanks very much for your answer Rolf,

I have try it today handheld with my rig and it seems steady. I do understand the flicker problem at the 1/500 and I think at 1/200 of the second it is no flickering. I do know that I need to work the double the fps i.e 25p use the 1/50th of the second should be the correct settings for natural movement. You know I have seen music video from someone who use the AF101 and looks great at 1/500. I do remember when I got my Canon 5d mark 2 with 50mm 1.4 and I have had no knowledge about correct shutter speed and use it fully open at 1.4 with no ND filter and the speed could go up to 1/4000 and then the results was very beautiful for my like. I thought why not to try it again. Maybe for some cases will look good ( like the music video ) and for some not.
 
Hi Costa,

you decide on the look. There is no right or wrong. That's what all we ever do is about.

And show us some material if you have it....
 
Thanks Rolf,

I will try to make some tests and show to myself first and then to you.
It was great talking to you.
By the way I like your work very much. I have seen all your tests in Vimeo.
Also the TIPOTA in your profile name is it from the Greek word which means nothing?
Many greetings from rainy Cyprus - instead of sunny we used to say. Weather has change. We never have had so much rain as now in the month November.
Costas
 
You should test as much as possible, because I still think 1/500 is way, way too short for next to anything - apart from maybe shoot 50p with 1/500 because you want to use Twixtor or Motion for slowing it down in post alter on.

And: Yes. It's "tipota" as in the answer for: "ti na kanume".... ;-)

(learned years ago "ligaiki" of "Pidgin-Greek")
 
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