Hi! I had the same problem recently with my Canon EOS 60D with the same lens you have. Well, as far as I am concerned I had to film a scene with no lot of light, with dim light. After my first test, I could see some light flickering. So I tried a longer shutter speed and reduce the aperture to keep the same exposure I would, and it was better like this. I don't know for your scene it can work but you can try!

Maybe you must to set your shutter time so low as possible.

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I too have a Canon 550D and use the lens you are using. I have virtually no light flicker. I make sure I'm on manual mode, I turn off auto lighting optimizer, turn the lenses' IS (Image stabilization) off, set a custom white balance, and then make sure to activate the shutter a good distance away from the set and return to the same general position each time I take a shot. Wearing dark clothing can help as well.

Occasionally I will have some light flicker (sometimes its cause I just lightly bumped a lamp just a tiny bit. This can affect it.) When I do have flicker, I go in and adjust the brightness of the problem frames individually until they are in line with my other ones. This actually works quite well and does not take too long depending on what software you use. Hope some of this helps! Let me know if you have any questions.

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Basically, the light flicker is caused by the canon lens.
- the aperture opens to get max light onto the sensor,
- just before the actual picture is taken, the aperture closes to the set value,
- after the picture is taken, the aperture opens up again.

So each picture, the aperture closes to the set value, but unfortunately, it does so a little bit differently each time: sometimes the aperture is a little bigger (more light) sometimes a little smaller (less light). Ergo: light flicker! Makes sense?

Solution: use lenses that keep the aperture REALLY fixed. For OBD (see sig) I use 40 to 50 year old manual lenses: pentacon with an M42 mount and an adapter. These are not terribly expenive where i live... I got 3 lenses plus adapter for under 80 euros.

I got this information from the DragonFrame site...

Last edited by boardron (February 15, 2012 (01:11pm))

Yeah that matches up with what I read on SMP, even though I do use dragon. What lenses to you use? I've wanted to get some old M42 lenses for a while, but I'm not sure what the best ones are. I see a lot of old lenses for old pentax cameras (I actually have one) in charity shops, but they are made to fit the pentax k series, so it may be hard to get an adaptor. I'll look out for M42 lenses at boot fairs when they start again, I'd just like to have an idea what to look out for. 35mm and 50mm are good animation lenses I think, right? Thats what mobiledeli uses I think, with close focus adaptors (which I've got).

And thanks too ANP, although I think that if that was the problem I would have had this problem for ages, I've used the same lights now for years.

Thanks for the help everyone

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Okay, thanks a lot!

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