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12-26-2010, 05:33 PM - 1 Like   #16
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QuoteOriginally posted by Rense Quote
Don't know this work...will look for it. I hope it's still available second hand?
The link is to the Amazon listing which at this moment says: 75 available from $0.09, so everyone should BUY IT RIGHT NOW!!!

12-28-2010, 08:04 AM   #17
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QuoteOriginally posted by newarts Quote
First remember that when a lens with F-Number N is extended so it has a magnification of M, it has an effective F-Number of N(1+M).....we will use this later.
...
Thanks for the thorough explanation :-)
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