Line/band in image.

[Carpy2001]

Can anyone explain why this happened please??.
Images taken on an Olympus EM10ii with 14-42ez, using off camera flash and remote trigger. I know some of the images are very bright, but I was playing with flash setting, trying to learn about them lol.
Please note that this only happened on a few images as shown in a screen shot below.
cheers Andy

 

[Dale.]

What is yor shutter speed and what is the sync speed of the EM10?

 

[Gav.]

Your sync speed on your body is 1/250, as Dale may be thinking above, your shutter speed may be above this.

Set your shutter speed to 1/250 or just below, with a lowish ISO and use the flash power mixed with a suitable aperture to control your exposure.

I use differant gear but my settings for macro are around the following.. (just as a starting point)

Manual mode
ISO 100
SS 1/250
f11-f32 (pick to use a DoF to cover subject)

Then increase the flash power to the 'correct' level to get a good exposure, remember subject distance to your flash/camera affects the power/exposure.

The dark patches in your images could be caused by the shutter curtains getting in the way by using a SS that's too fast.

 

[realspeed]

wrong post

 

[Phil V]

As above, it looks like you’re using a variety of shutter speeds including above sync speed.

At those kind of distances, you might be able to use HSS** if you really want to use a higher shutter speed, but generally I’d advise shooting either Manual* or Program mode with a flash to ensure avoiding this.

Manual including a fixed ISO, so you can control the ambient exposure, and ETTL on the flash to enable the camera to manage the flash exposure. In P mode your camera will take a guess as to the required ratio of ambient and flash, which many people are fine with, but I’d rather not take a risk, I like to control it.

*The flash whilst extremely fast needs to be able to expose the whole frame at once. And at higher shutter speeds the entire frame is never visible, the shutter is like a slit moving over the frame.
So Sync speed is where the first curtain has moved down the sensor and there’s a tiny amount of time before the second curtain moves to cover the sensor. During that time the flash fires.

**In a completely counterintuitive way, HSS (high speed sync) actually fires the flash for the duration of the exposure, so the flash burns for longer, which makes it work harder.