AaronChicago Posted February 19, 2014 Share Posted February 19, 2014 I just picked up the Nikon Speedbooster for the Sigma 18-35. How do you accurately judge what F-Stop that you're at? It's numbered as 7 stops, which I'm guessing is up to f22. There's just no easy way to quickly jump to f4, or f2.8 if you need it without doing math. Quote Link to comment Share on other sites More sharing options...
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