Understanding the bellows factor - mamiya C330

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J Rollinger

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My Mamiya C330f has a focus screen with markings and a needle so you can adjust the exposure for the bellows extension but i dont know how to make the correction. The marks are as follows - 1.5 - 2 - 2.5 - 3 I know this cannot mean 1.5 stops and up to 3 stops, can anyone help me understand how to adjust the exposure using those numbers?
 

Q.G.

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The numbers translate thus :
1.5 = +1/2 f
2 = +1 f
2.5= +1.5f
3 = +2 f
The steps are in 1/3 stops:

1.5x = +0.6 stop
2x = +1 stop
2.5x = +1.3 stop
and 3x = +1.6 stop

But when you can't set 1/3 stops, it indeed (almost) translates to the 1/2 stop list above.
Almost, because it would be 'closer' to round 1.6 down to 1.5, not up to 2.
 

benjiboy

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There is also a plastic paralax correction plate that fits under the focusing hood to give correct index marks for the 55 and 65mmwide angle lenses
 
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