johnortt Posted December 1, 2015 Share Posted December 1, 2015 Hi Everyone, I am hoping for a little help with something that has been confusing me recently. I have seen a lot of posts in the forums where people are saying things along the lines of the 56mm f1.2 Fuji lens should really be considered as a f1.8 when compared to lenses on a full frame camera? Is this correct? The thread I saw it in most recently was: http://prometheus.med.utah.edu/~bwjones/2014/08/fuji-56mm-f1-2/ specifically the following post: Please don’t compare the 1.2 Canon FF-Lense with an Apsc-Lens regarding the size. Full-Frame needs more light and thus a bigger front-element to capture it. If you already say, 56mm is 85mm in FF, then also point out, that the aperture would be a F1.8 compared to a Full format. And the FF-Lenses with 85mm F1.8 are similar in size and weight. Or use the 85mm 1.2 from canon with a speedbooster on the fujifilm and you have got a real 1.2 Aperture, (or get a F. 0.8 for the apsc) not a cropped one. Please don’t forget to add the crop-factor to the aperture too. Companies do it to fool people, but they do it on purpose. Tobias K I understand the theory, (ie bigger lenses mean more light) but surely this has all been factored into the Fuji lens calculations to ensure the comparisons are accurate. There are also factors such as the sensors proximity to the back of the lens on mirrorless cameras that to some extent must cancel the size issue out. I would really appreciate some help understanding this one. Thanks John Quote Link to post Share on other sites More sharing options...
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