Originally posted by Ishpuini Correction (see my earlier post, and the exchange on DPR): 30% light loss because of the mirror, this corresponds to roughly 1/2Ev (half a stop) less light reaching the sensor. Sorry to repeat this, just trying to avoid wrong information being propagated.
So it's not as dramatic as what you write, but of course the deductions from the resulting images stand.
Wim
How am I wrong, only 70% of the light gets through, if it was 50% it would be half the light. AKA 1 stop. 70% of light getting through is a loss of 3/5ths of a stop, which is larger than 1/2. It is 60% of a stop light fall off.
I am not wrong. Its just a different way of stating it.
I could state that its more than a 50% of a stop light fall off. which would also be right. Roughly 1/2 a stop is also right, although less accurate.