davide sorasio Posted July 18, 2017 Share Posted July 18, 2017 Hello everyone, maybe this is a silly question but it has been in my head for a while. Once I have a close and far focus chart for a certain focal lenght, could it be used for the same focal lenght of another set of lenses that have the same T-stop when wide open? For example, shooting at the same settings on the same camera with a 75mm Master prime using a diopter +1 would give me the same far and close focus if switching to another lens with the same wide open T stop? and if not, which are the factors that influence close and far focus on diopters except from the diopter's gradation? Thanks in advance Quote Link to comment Share on other sites More sharing options...
Kar Wai Ng Posted July 19, 2017 Share Posted July 19, 2017 If the other lens is a 75mm Master Prime, then you would have the same near and far focus point; with another make of lens like a Cooke 75mm, however, you would have slightly different results because the entrance pupil is different. I don't think it would be dramatically different. A +1 diopter would still put your infinity at 1 meter in front of the diopter, theoretically. Quote Link to comment Share on other sites More sharing options...
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