Config timer for input capture 328p chip

For 16Mhz clock source, the following configuration is used to create 0.5us tick:
I know that CS11 is an 8x prescale.

    TCCR1A = 0;
    TCCR1B = _BV(CS11);
    TCCR1C = 0;

How can I keep 0.5us tick for an 8Mhz clock source?
Thanks!

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There is no prescale of 4 so you have to use a prescale of 1 (Set only CS10) and divide the elapsed time by 4 after you capture the value. If the 8 MHz clock rate is too fast and your timer overflows, use the timer overflow interrupt to increment a byte. That will extend your 16-bit timer to 24 bits.

In the input capture interrupt handler, if the timer count value is small and the Overflow flag is set there is a pending overflow interrupt so add 1 to the overflow count when you use it.

The direct answer is, you can't. Prescalers only come in a few flavours and after 1 there's 8. The real question is, what do you want to do with a 0.5us tick? There are other ways.

Thanks for your information!
Your answers are helpful!