18% Gray Card Set 8X6" 6X4" for White balance exposure

Discussion in 'Linkdelight Photography Accessories' started by Link Delight Online Shop, Sep 14, 2010.

  1. Link Delight Online Shop

    Link Delight Online Shop Official Vendor Supporting Vendor

    Nov 4, 2009
    Likes Received:

    If we set the reflection ratio to 100% (as maximum) and decrease progressively as common ratio of 2, we'll get the density value of full-level diaphragm: 100, 50, 25, 12.5, 6.25, 3.125…… if the reflection ratio decrease progressively as square root of 2, we'll get the density value of half-level diaphragm: 100, 70.71, 50.35, 36.25, 17.68, 12.5, 8.84, 6.25, 4.42, 3.125…… Actually those values are just different grey values in different grades. We take it that the standard exposure value is 17.68, then those values beside it will be its exposure latitude.

    the price: $7.99

    more details:
    18% Gray Card Set 8X6" 6X4" for White balance exposure

    Blazzeo Octagonal 95cm Dia Studio Photo Flash Softbox


    Blazzeo Slave Trigger Receiver for Studio Flash 16-Channel


    1-2.5X Angle Finder for Canon Nikon Leica Pentax DSLR

    US$58.00 US$43.00

    Extension Tube Macro Ring for Canon DSLR Camera & EF Lens


    Multifunction Swivel Flash Mount & Umbrella Holder


    Nikon d3100 battery grip, LP-E5, LP-E6, LP-E8,BP-511A, CP-E4,NB-2LH, EN-EL3E, EN-EL9, EN-EL3A, SD-8A, MK-MH21, NP-FW50, FA-EB1AM, NP-FM500H, D-Li90, NP-400, D-Li90, SLB-1674, nikon d3100 remote shutter release , canon 550d battery grip , nikon d5000 battery grip, canon 7d battery grip, canon 60d battery grip, bge6, gigtube wireless , fotopro tripod , triopo, redhead halogen light
    Last edited: Apr 18, 2011

Share This Page

Search tags for this page
3.125 square root
grey card reflection
sq root of 3.125
square root 3.125

square root of 3.125


what is 3.125 square rooted

why is the reflective ratio 18%