There is a Wikipedia article on rolling shutter effect covers it pretty
well. You can also see it on the Q series when using a lens without a
leaf shutter, like a K mount lens on a simple adapter. since the Q
defaults to an electronic shutter for lenses without leaf shutters.
I tried several brands of LED's and stumbled into a brand called Living
Solutions that produced no banding. I tried a handful of other brands
but those all produced banding, as did incandescent and CFL bulbs.
The shutter speed does have an effect on it - see this post:
http://www.markcassino.com/b2evolution/index.php/pentax-k-1-banding?blog=9
Mark
Jostein wrote:
LOL well I hardly expected the first to figure it out. How nice that
Pentax has evolved the feature in K-1.
I'm too new to the method to actually be able to recognise what the
rolling shutter issue is about, I think. I use some el cheapo LED
lights from IKEA (Like this one:
http://www.ikea.com/no/no/catalog/products/60309355/ ). But I have a
Manfrotto Micropro2 too that I can test.
Jostein
Den 25.09.2017 01:21, skrev Mark C:
You can also set the K1 to use an electronic shutter in live view
mode, no pixel shift.
With the camera set to 3 second delay and electronic shutter, you can
minimize any kind of shutter shake almost as effectively as using
flash and minimizing / eliminating ambient light. But I found that
many artificial light sources create some degree of banding due to
the rolling shutter effect of the electronic shutter. LED, Tungsten
and compact fluorescent bulbs all produce it. I finally found a
brand of LED's that does not produce noticeable banding by trial and
error.
Aside from banding the problem with ambient light is that there can
be a surprising amount of movement in subjects due to minor air
currents or vibration.
Mark
Jostein wrote:
Eerily quiet from the List, so here's to check the throughput of the
transatlantic fibreoptics and whatnot.
In my enduring foray into extreme macro, I always come up at
vibration as the ultimate limiting factor to sharpness. Good camera
fundament is a must. Flash is a necessary evil. Mirror lockup is an
indulgence for vibrations in the sincerest catholic sense of the word.
But the shutter's guilliotine movement is hard to circumvent. Some
macro photographers like John Hallmén of Flickr fame
(https://www.flickr.com/photos/johnhallmen/), switched from a Canon
DSLR to a Sony mirrorless for studio work for that reason.
In the Pentax lineup, this issue makes the Q7 a very attractive
alternative, at least when megapixel cravings can be curbed.
However, one genious little thing about the Pixel Shift feature in
the K-3ii, K-1 and K-P, is that it does use an electronic shutter.
Combined with mirror lockup, the camera will flip up the mirror
_and_ open the shutter on the first press of the shutter button, and
then start the exposure on the next.
Geeky, I admit, but I thought that was neat. :-)
Negates the use of flash, though. :-(
Carry on. :-)
Jostein
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