Rollei 100xl Flash Question for use with Rollei 35 S

I recently got the 100 xl flash for my Rollei 35 S. It says what f stop to use at what distance, and has a wheel on the back of the flash for me to enter my iso in order to calculate the f stop i should use, but mentions nothing about shutter speed. What shutter speed do I set the camera to when I want to use the flash as the key light?

Thanks!

The Rollei 35 has a leaf shutter. Such work with a flash at all shutter speeds.

@AgX Yes, but depending on what shutter I choose, the exposure will be brighter or darker, so how do I know WHICH shutter speed to choose?

No, as you had it about flash as "key" light.

The calculator is based on flash exposure (in a white room) without further lighting.
In case of additional continuous lighting for this part of lighting the exposure of course will be influenced by the exposure time.
You then have to meter the continuous light for the given flash-aperture and set the result in relation to the pure flash exposure and if necessary control the continuous part by the shutter speed.

Another aspect to be taken into account is motion blur for moving objects mainly lighted by the continuous part of lighting.

Daniel, shutter speed only affects ambient light, and has no bearing on the flash exposure. When dealing in 'normal' flash photography, the shutter speed has no affect at all on the final image.

If you were to shoot an indoor scene that would require a shutter speed of 1/15, but instead use a flash and set the shutter speed to let's say 1/250, all that will be captured is what's illuminated by the flash up to the distance that corresponds to your chosen aperture. You'll also get some underexposed stuff from the fall-off, but for argument's sake, it's the aperture that determine's the amount of light captured.