Rolling shutter in Slow Motion - Video.

[LongQ]

Courtesy of DPReview.

http://www.dpreview.com/articles/7983095405/canon-...


Interesting background to understanding how things work.

Frozen in time? Hmm. Not quite - at any speed.

[Simpo Two]

Interesting - though not new!

[RobDickinson]

This is why you have a flash synch speed. The fastest shutter speed the entire frame is exposed at once.

[LongQ]

Simpo Two said:

Interesting - though not new!

No, not at all new but as you say, interesting.

Also slightly amusing that we think in terms of "shutter speed" when in fact the speed of the shutter as it moves is, within tolerances, always the same.

[Simpo Two]

I wonder how the electromagnetic shutter in the Nikon D70 worked? I could synch up to 1/2000th with that - so it must have done something differently. And why hasn't it been retained?

[RobDickinson]

Simpo Two said:

I wonder how the electromagnetic shutter in the Nikon D70 worked? I could synch up to 1/2000th with that - so it must have done something differently. And why hasn't it been retained?

D70 had a CCD sensor, a physical first curtain shutter and an electronic second curtain. CCD allows the whole sensor to be read at the same time and can effectivly stop exposure at that point.

Most cameras now use CMOS sensors that read data in lines, this takes some time ( up to 1/30th of a second irrispective of shutter speeds..!) means you cant have an electronic second shutter.

[Mogul]

Good post. Quite 'shocking' to see the mirror bounce like that.

When shooting in continuous mode, do the first and second curtains stay closed and return home before dropping again or are the even numbered shots taken with the curtains moving in the opposite direction?

[outnumbered]

I'm ashamed to say that I didn't realise digital SLRs still used mechanical shutters - I assumed it was all electronic.

[Simpo Two]

outnumbered said:

I'm ashamed to say that I didn't realise digital SLRs still used mechanical shutters - I assumed it was all electronic.

And the 'Ker-chunk' noise of the mirror whacking back and forth was just a sound effect?

'R' is for mirror