Reply to thread

Message

<blockquote data-quote="WayneF" data-source="post: 345382" data-attributes="member: 12496">Nikon offers Matrix, Center Weighted, or Spot metering (a user switch).Matrix is &quot;affected by&quot; the focus spot, but there are many other factors over the full frame, and is much closer to full frame than to spot.Frame sizes vary, DX and FX.&nbsp;&nbsp; Speaking of the D7100 DX model:Center Weighted is an adjustable area, the DX 7100 offers 6, 8, 10, or 13 mm diameter (center weighted) in the 24x16mm frame.Spot metering is a 3.5mm spot (DX frame, about 2.5% of the frame) at the moveable focus point.The D800 FX frame says spot is 4 mm diameter (1.5% of 36x24mm frame) at the moveable focus point,and Center Weighted is 8, 12, 15, or 20 mm diameter.Camera metering (including Spot metering) is ambient only, TTL flash uses its own version of center weighted.&nbsp; My notion is a slightly smaller center area.&nbsp; And in many cases, flash is subject to a minimum shutter speed, which is not about ambient either.You are aware that Spot metering just makes the spot come out middle gray?&nbsp; Not &quot;correct&quot;, but middle tone, regardless.&nbsp; If on a human face, you will likely need about +1 EV compensation.</blockquote>

[QUOTE="WayneF, post: 345382, member: 12496"] Nikon offers Matrix, Center Weighted, or Spot metering (a user switch). Matrix is "affected by" the focus spot, but there are many other factors over the full frame, and is much closer to full frame than to spot. Frame sizes vary, DX and FX. Speaking of the D7100 DX model: Center Weighted is an adjustable area, the DX 7100 offers 6, 8, 10, or 13 mm diameter (center weighted) in the 24x16mm frame. Spot metering is a 3.5mm spot (DX frame, about 2.5% of the frame) at the moveable focus point. The D800 FX frame says spot is 4 mm diameter (1.5% of 36x24mm frame) at the moveable focus point, and Center Weighted is 8, 12, 15, or 20 mm diameter. Camera metering (including Spot metering) is ambient only, TTL flash uses its own version of center weighted. My notion is a slightly smaller center area. And in many cases, flash is subject to a minimum shutter speed, which is not about ambient either. You are aware that Spot metering just makes the spot come out middle gray? Not "correct", but middle tone, regardless. If on a human face, you will likely need about +1 EV compensation. [/QUOTE]

Verification