Did some trial.
Not sure if the science is correct. My assumption is that the definition of 1:1 ratio is that the real life subject in Xmm will be exactly that as seen by the sensor, i.e. Xmm on sensor.
At x12 for FZ30 with the Raynox 250, I can take a pic 12mm x 9mm.
The FZ30 sensor is 7.18mm x 5.32 mm.
So dimension to dimension wise, the mag rate is 1 : 0.59.
This is the more technical way.
However, if I use the 35mm way
Where:
magnification factor = f / ( 1000 / d )
f = focal length in 35mm terms
d = dioptre value
than mag rate at x12 or 420mm, dioptre of Raynox 250 is +8, than Mag rate is 1:3.36
So frankly, I am not sure which way is right.....I just shoot and take pics!
Not sure if the science is correct. My assumption is that the definition of 1:1 ratio is that the real life subject in Xmm will be exactly that as seen by the sensor, i.e. Xmm on sensor.
At x12 for FZ30 with the Raynox 250, I can take a pic 12mm x 9mm.
The FZ30 sensor is 7.18mm x 5.32 mm.
So dimension to dimension wise, the mag rate is 1 : 0.59.
This is the more technical way.
However, if I use the 35mm way
Where:
magnification factor = f / ( 1000 / d )
f = focal length in 35mm terms
d = dioptre value
than mag rate at x12 or 420mm, dioptre of Raynox 250 is +8, than Mag rate is 1:3.36
So frankly, I am not sure which way is right.....I just shoot and take pics!
