R5 weird "stuttering lines" shutter

Sittatunga wrote:

Ephemeris wrote:

Sittatunga wrote:

Karl Petersson wrote:

Thanks for the answer, so its basically damned if you do, damned if you dont.
Somedays I miss those old tungstens lights but then I remember the heat.

You need a continuous light source to achieve what you were trying to do. I've just tried with my EOS R in silent shutter (i.e., ES) mode, my hand moving across a ⅛s exposure lit by my domestic room light (a 13W 2700K Philips domestic LED bulb) and that didn't look too bad. That bulb takes ½s or so for its phosphors to stop glowing when it's switched off, which will even out its light output. There were continuous striations parallel to the direction of travel, but these also appeared with EFCS and when using both curtains, and I got similar striations using a halogen bulb torch for lighting, so I don't think they're from the LED bulb.

Is the 0.5s decay what occurs with that typical type of bulb? I recall reading about luminophore as a coating Philips were using but I don't recall the luminous decay time after the current is switched off. Interesting stuff.

I think most of our lamps are dimmable so the driver frequency is much higher.

Would you know if Philips have this in an article or data sheet?

This is just my observation, of my own domestic lighting. I don't think that particular bulb is dimmable, and I certainly wouldn't try that sort of picture under dimmed domestic lighting anyway, that's just asking for trouble. Use a lower powered bulb or move further away from it. Preferably use a photographic lighting panel, but that costs money.

I understand. The point of mentioning dimmable LED lamps, which are what we have throughout is that they are not driven at a multiple of the mains frequency. So banding is likely to not occur in the first instance. The bulbs can be used with a standard on/off light switch. May be worth a try?