I was having trouble finding the ISO charts for that one...Originally Posted by Joel Eade
This one plus a 1.4 extender would probably have pretty good IQ above 1300mm..... but you have to sell your house to get one
http://www.the-digital-picture.com/R...ns-Review.aspx
and if I sold my house where would I live. I guess I could push this lens around in my grocery cart.
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