freddie bonfanti Posted July 21, 2006 Share Posted July 21, 2006 hi all im testing my new 814xl´s internal meter with a sekonic 558. i noticed a few stops of difference and i was wondering why...i think that the problem is that i set my meter at 64 when probably the camera´s one is preset to a different ISO number. but then i dont understand why the camera suggests to shoot at 5.6 and the sekonic incidental reading at 2.0, i mean i doubt the camera is preset at a higher ISO number... is the meter faulty? Link to comment Share on other sites More sharing options...
Daniel Stigler Posted July 21, 2006 Share Posted July 21, 2006 To compare a reading taken with an incident lightmeter to a reading taken through the camera (spot) the camera needs to be pointed at a greycard. Did you do this? Link to comment Share on other sites More sharing options...
freddie bonfanti Posted July 21, 2006 Author Share Posted July 21, 2006 yes, and i also forgot to say that the sekonic is working fine as it was tested not long ago. Link to comment Share on other sites More sharing options...
Guy Bennett Posted July 21, 2006 Share Posted July 21, 2006 The readings from your camera and light meter are going to differ, independant of whatever techniques you might use to take a light reading, because of the light absorbed by the lens elements and the viewfinder, and the longer the focal length, the more light absorbed. My camera (a Nizo 801m) shows anywhere from 1/2 stop to 3-3 1/2 stops difference at shortest and longest focal lengths, when compared to readings in the same light from my light meter (a Gossen Lunapro Digital). The difference between them is described as the difference between f-stops and t-stops. Link to comment Share on other sites More sharing options...
freddie bonfanti Posted July 22, 2006 Author Share Posted July 22, 2006 The readings from your camera and light meter are going to differ, independant of whatever techniques you might use to take a light reading, because of the light absorbed by the lens elements and the viewfinder, and the longer the focal length, the more light absorbed. therefore what should i trust? should be the incidental lightmeter, right? Link to comment Share on other sites More sharing options...
Daniel Sheehy Posted July 22, 2006 Share Posted July 22, 2006 (edited) Are you sure comparing using an 18% grey will work? Wouldn't it be better to meter an average scene...?(no strong back light etc) just curious. Edited July 22, 2006 by dsheehy Link to comment Share on other sites More sharing options...
freddie bonfanti Posted July 22, 2006 Author Share Posted July 22, 2006 hi, metering a grey card was my safest option, the sekonic l 558 has a spotmeter function so i made measurements with both spotmeters. the camera´s one was 2 stops over. the i took an incidental reading in a room and i took another reading with the camera and still, 2 stops over. id rather rely on the sekonic as i always use it Link to comment Share on other sites More sharing options...
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