> Is there any way to figure out or calculate which hood goes with 
> which lense?

It's simple trig.   I wrote an excel spreadsheet
to calculate the maximum (ideal) hood length
for a given filter thread, focal length, and hood
diameter. It's still posted at:

http://jcoconnell.com/HOODCALC.XLS

TRY IT ITS free!!!
jco

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