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some technical stuff:

• using the 210 lens - if the bellows length = 210 

NO COMPENSATION NEEDED

• if bellows = double the length of the lens, so...... 210mm lens = 410mm bellows extension 

YOU NEED TO PLUS 2 STOPS

• if bellows = half the length aditional to the lens, so....... 210mm lens = 210 + 105 = 315mm bellows

YOU NEED TO PLUS 1 STOP

TODAY

i am using the 210mm lens and the bellows are 25cm. As a result i need to add half, so half a stop.


instead of adding stops i am changing the light instead as i want to keep at f.16. Therefore my light is now on 378