If I shoot 1/240 (or close to it) with 120fps will I get motion blur in the resulting slomo? If I further slow it in post to 30fps (8x) will that also show motion blur?
Motion Blur shooting 120fps ?
- Thread starter akdrone
- Start date
1/240S is ~4.2mS. Figure out how fast your object is moving to see how far in that time.
I’m intrigued by your question with plans to slomo. Care to share your plans?
Catfish …
You’ve got the right idea, and you’re spot on with the math. When you set that shutter to 1/240 while shooting at 120fps, you are basically painting a little bit of natural blur into every frame. Since that blur is captured the moment you hit the record button, it stays there no matter how much you slow it down later. When you drop it onto a 30fps timeline, you are just letting each of those slightly blurred frames breathe a bit longer. It is what gives you that smooth and buttery look rather than that choppy motion you see when the shutter speed is cranked up too high. It is the same principle whether you are flying your Mavic 3 Pro or the little Neo. The only thing to watch for is that on those brighter days, especially with the fast lenses on the newer Mavics or the Mini 5 Pro, you will almost certainly need an ND filter to keep that shutter down at 1/240 without blowing out the sky. Stick with that 1/240 setting because it is the secret sauce for making slow motion look like the real deal instead of a digital glitch.
thanks for that calculation and clearly I would need a very fast moving subject and not....dogs. I'm in Alaska and in a few weeks one of the major dog races will be held. This is a video from another such race. I thought it might be interesting to fly along side the dogs and film at high speed to be able to dramatically slow it down and wondered if there might still be some sense of motion blur but clearly not
. I will do some slomo and some follow along side with motion blur and not worry about trying to do both at once .slowing it down won't remove the blur that's not how it worksthanks for that calculation and clearly I would need a very fast moving subject and not....dogs. I'm in Alaska and in a few weeks one of the major dog races will be held. This is a video from another such race. I thought it might be interesting to fly along side the dogs and film at high speed to be able to dramatically slow it down and wondered if there might still be some sense of motion blur but clearly not
ea
each frame is like a short time-lapse that stayes there no matter whatthanks for that calculation and clearly I would need a very fast moving subject and not....dogs. I'm in Alaska and in a few weeks one of the major dog races will be held. This is a video from another such race. I thought it might be interesting to fly along side the dogs and film at high speed to be able to dramatically slow it down and wondered if there might still be some sense of motion blur but clearly not
FLDave
Well-Known Member
Slowing down frame playback isn't going to create motion blur. The blurriness is just whatever existed in the individual frames. In still photography high speed shutter is used to reduce or eliminate blurriness of a fast moving subject, so 1/240 second exposure will eliminate blurriness unless it is a fast moving subject up close. Blurriness is created when the subject moves while the shutter is open for just 1/240 second. It will be quite a sharp image. That same sharp image will be the same sharp image whether played back at 30 fps, 60 fps, or 120 fps. Playing back at a slow speed your eyes may perceive jerkiness of the sharp images shot at 1/240 second. Just try it and find out.
you dont lose it but you may perceive it differently you can try the and you get 240fps at 1080 and 120 at 4kthanks for that calculation and clearly I would need a very fast moving subject and not....dogs. I'm in Alaska and in a few weeks one of the major dog races will be held. This is a video from another such race. I thought it might be interesting to fly along side the dogs and film at high speed to be able to dramatically slow it down and wondered if there might still be some sense of motion blur but clearly not
thanks for that calculation and clearly I would need a very fast moving subject and not....dogs. I'm in Alaska and in a few weeks one of the major dog races will be held. This is a video from another such race. I thought it might be interesting to fly along side the dogs and film at high speed to be able to dramatically slow it down and wondered if there might still be some sense of motion blur but clearly not
Loved the video! When you were panning with the team (1:03) the dogs are not fast enough across the background to get much blur, but the dog legs are moving fast enough to need a faster frame rate. I look forward to next race video.
My Iditarod Race tangent ... A close motorcycling friend flew up years ago for the race and met a race-dog breeder. She learned about the litter runts (not big or fast enough to race) they must give away. She got a runt! And currently has her 3rd almost-Iditarod Runt!
Catfish ...
There seems to be some disagreement as to whether it would work. I won't make it my most important clip but I will put it on my list of clips I will plan to take. My biggest challenge will be the start of the race. I will use a 360 camera to get the dogs coming at me and going away more seamlessly than I could panning a video camera. After one or two dogs I'll grab my drone and get one or two more then race down the road to find crossing spot where I can toss my drone up.
With that in mind, instead of using a high shutter speed for motion blur I think a 60/30 combination would result in each frame exhibiting some motion blur and then, in post slowing down the motion by 2x or 3x. (4x would not work as it can't be divided into 30 evenly). That results in simply removing every other frame or every third frame and a slowmo effect that should be clean.
Any other thoughts on this?
I understand that simply using slomo or slowing down in post won't make any difference. I was wondering if I used 120fps and the shutter speed of 240 if motion blur would still be noticeable when it is played back at 30 or 60fps. If each frame exhibits motion blur I would expect it to work fine but if that shutter speed is just too fast, as it might well be for running dogs or running people then it won't. I would guess with a fast moving car a shutter speed of 240 could result in motion blur but now that I am thinking about it more I doubt each frame would show much if any motion blur with that shutter speed.
With that in mind, instead of using a high shutter speed for motion blur I think a 60/30 combination would result in each frame exhibiting some motion blur and then, in post slowing down the motion by 2x or 3x. (4x would not work as it can't be divided into 30 evenly). That results in simply removing every other frame or every third frame and a slowmo effect that should be clean.
Any other thoughts on this?
i would say have a word with Gemini about it. it will look for examples of people doing this and talk about how they dealt with it. i run a lot of stuff by it for an opinion, its not always right but it more accurate than most sources.
Kilrah
Well-Known Member
What is your actual goal? If you want motion blur shoot at the slowest speed you can (equalling fps). If you don't want it shoot faster. Run tests before the thing to figure out what you prefer.
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