# A question on fast shutter speeds

Discussion in '35mm Cameras' started by Brian, Jul 27, 2003.

1. ### BrianGuest

If I use a faster shutter speed does this mean that the camera mirror
jumps out of the way faster or does the mirror move at the same speed
for all shutter speeds?

Regards Brian

Brian, Jul 27, 2003

2. ### SwashBuckleGuest

I am guessing here and from having scanned Gooooooogle with no answers, I
would say just 2 speeds. Those being working at a single speed for all
options or stopped (locked up).

swash

SwashBuckle, Jul 27, 2003

3. ### Rudy GarciaGuest

The mirror swings up at the same speed reagrdless (unless MLU is used of
course). Perhaps surprisingly, the shutter curtains also move at the
same speed across the focal plane, regardless of the shutter speed.
What determines the shutter speed is how quickly the second curtain is
fired after the first.

For example at the X-Sync speed for your camera, the second curtain is
not fired until the first curtain has traveled all the way to the end
(ie. the film frame is fully open to the incoming light). Faster
shutter speeds cause the second curtain to start its travel
progressively closer to when the first curtain started. This creates a
slit whose width is inversely proportional to the shutter speed (the
faster the shutter speed, the narrower the curtain).

Rudy Garcia, Jul 27, 2003
4. ### ColynGuest

Each camera has a set speed at which the mirror move upward. So
whatever shutter speed you select, the mirror moves up at the same
speed.

The shutter curtains also move at the same speed regardless of which
shutter speed you use. Shutter speed is determined by the width of the
slit between the first and second curtain.. The faster the shutter
speed, the narrower the slit and wider at slower speeds..

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Colyn, Jul 27, 2003
5. ### Michael ScarpittiGuest

No, the mirror moves up at the same speed.

Michael Scarpitti, Jul 27, 2003
6. ### Wes JGuest

Maybe a different question: When uing a camera like the F5 at 8 frames per
second, does the mirror actually go up and down 8 times a second?

Wes J, Jul 27, 2003
7. ### MxsmanicGuest

The mirror always moves at the same speed on a given camera. The
shutter will not open until the mirror is completely out of the way.

Mxsmanic, Jul 27, 2003
8. ### MxsmanicGuest

Yes, indeed, it does. The F5 mirror is amazingly fast. If it didn't
move for each and every exposure, you wouldn't be able to see what you
were shooting at 8 fps.

Mxsmanic, Jul 27, 2003
9. ### Bot-tasticGuest

also a Rangefinder does not have this .

Bot-tastic, Jul 28, 2003
10. ### MxsmanicGuest

It has very little mirror vibration as well. You hear it more than you
feel it, and it doesn't make much noise.

Mxsmanic, Jul 28, 2003