Im going to do 600mm first as this is where the lens isn't sharpest see how it goes. I did the tokina 11-16 yesterday which gave me a -3 very good software I must say, very thorough and tell you if you lens is OK etc Another issue is having the laptop teathered to it, unless I have the tripod close to the ground it's a carry affair, I was thinking about rigging up an old surface pro 2 a bit lighter. #Cn i use reikan focal pro with a cannon camera and a sigma lens software# I think you have to see what the different values are and you can calculate the far distance then.
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