hop_phan Posted February 12, 2008 Share Posted February 12, 2008 Hi, A friend of mine use his 50mm1.8 II on his XTi and realizes that the closest focusing distance becomes much closer than then he uses on his filmcamera ( Elan 7E). He asks me why ? I do not know the answer . I'm using a 5Dand just tried the closest focusing distance with my 50mm 1.4 . Here are theresults : distance from subject to front glass of lens : 0.36 meter; distancefrom subject to film(sensor) plane : 0.46 meter ( lens specification : 0.45meter ). The closest focusing distance is measured from the subject to where ? to front glass or to film ( sensor ) plane ? Is the closest focusingdistance of a lens varies depending on camera types such as film camera ,FFDSLR and cropped DSLR ?Please give me the answer. Thanks . Link to comment Share on other sites More sharing options...
andrew robertson Posted February 12, 2008 Share Posted February 12, 2008 Actually, his XTI has a smaller sensor than 35mm, so the image looks more magnified, but the minimum focus does not change. Link to comment Share on other sites More sharing options...
bobatkins Posted February 12, 2008 Share Posted February 12, 2008 The minumum focus distance is exactly the same on all EOS bodies, film and digital. The magnification on the sensor is also exactly the smae, but APS-C digitals cover a smaller area. Link to comment Share on other sites More sharing options...
bueh Posted February 12, 2008 Share Posted February 12, 2008 Minimum focus distance is measured from subject to film/sensor. At the left side of the viewfinder, close to the mode wheel, is a small symbol (looks a bit like ∅) that shows where the sensor plane is. Measure from there. Link to comment Share on other sites More sharing options...
PuppyDigs Posted February 12, 2008 Share Posted February 12, 2008 Maybe it appears that way because he's viewing the XTi image on a large computer screen vs. a slide or negative... Sometimes the light’s all shining on me. Other times I can barely see. - Robert Hunter Link to comment Share on other sites More sharing options...
bob_sunley Posted February 13, 2008 Share Posted February 13, 2008 The minimum focus distance is determined by the lens, not the camera body. Now a crop sensor digital will appear to focus closer as it has a narrower angle of view, but the image/film plane to subject distance will be identical for the same lens. Link to comment Share on other sites More sharing options...
hop_phan Posted February 13, 2008 Author Share Posted February 13, 2008 Thanks for all the replies. I do not own an XTi myself so I don't know what was happening. Maybe he never focus this close with his Elan 7 and the picture looks more magnified so he thinks that the distance gets closer. I was confused myself with the question and now I know. Thanks. Link to comment Share on other sites More sharing options...
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