dan_peffer Posted December 1, 2002 Share Posted December 1, 2002 My F5's focus point changes the meter reading by a 1/3 stop. Is this an error or is it a feature meant to fine tune exposure. When hand holding indoors, metering for ambient light, changing the focus point alters my reading in matrix mode. Thankyou for your answers. Link to comment Share on other sites More sharing options...
jonathan_ratzlaff Posted December 1, 2002 Share Posted December 1, 2002 Are you using a D lens and what type of lens? It may be that the focusing point may tell the matrix metering to emphasisze the segment that the focus point is in. this could change your exposure depending whether the tonality in the focus point is different than the rest of the image. Link to comment Share on other sites More sharing options...
dan_peffer Posted December 1, 2002 Author Share Posted December 1, 2002 Jonathon I was using a 50mm 1.4 auto focus and I assume D compatible. I placed the focus point on a lit painting and the to an area that was unlit. I was practicing my exposure compensation when I noticed the matrix was not constant regarding the focus point. Link to comment Share on other sites More sharing options...
ellis_vener_photography Posted December 1, 2002 Share Posted December 1, 2002 The 3d Color Matrix meter in the F5 isn't an averaging type meter and yes changingthe focusd on area will bias the meter to some degree to take into account your implied choice of most important area. it may also be affected by the different color of light in that area and also possibly by the movement ofthe lens' nodal point when focusing aon a different area (assuming that you are photographing a wall that is parallel to the film plane. Link to comment Share on other sites More sharing options...
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