Alpha Acids

[Isolec82]

I am sure that this has been asked many times. If i have a recipe that calls for Saaz at 4.2% and i have Saaz at 2.4%, is it as simple as using the direct ratio, and using 1.75 * the weight, or are there other factors at play here?

 

[Hoppy]

Yes for bittering, aroma remain the same, although some commercial breweries adjust their aroma by alpha.
BR
Hoppy