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YiNuo-photography
 
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Details about  18% Gray card set 8x6" 6x4" for White balance exposure

18% Gray card set 8x6" 6x4" for White balance exposure See original listing
18-Gray-card-set-8x6-6x4-for-White-balance-exposure
Item Sold
Item condition:
New
Ended:
Jun 19, 2012 10:44:17 PDT
Price:
US $8.50
[
History:
]
Shipping:
FREE Standard Shipping | See details
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Item location:
from Hong Kong, Hong Kong

Description

eBay item number:
260884617115
Seller assumes all responsibility for this listing.

Item specifics

Condition:
New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is ... Read moreabout the condition
Brand:

mennon

18% Gray card set 8x6" 6x4" for White balance exposure

 

Introduction

18% grey is used in the grey card as a base color. Both grey and white surfaces of the grey card have their own function. Whatever you used in film or digital photography, an 18% grey card can control expose value and balance the color so that it helps to revert the color truly and perfectly by measuring the exposure value, white/grey balance value and color temperature.
 
A grey card had been invented based on the optical principle and the characteristic of photosensitive film. The camera exposure value is in direct ratio with the logarithm of characteristic curve. Characteristic curve shows two important features of photosensitive material (they are: contrast factor and exposure latitude), and it is in coordinate with the sense of human sight in reflection to the colors in ray. When color changes as geometric progression, its density will change as arithmetic progression. If we try to get a series of density values like 1:2:3:4:5……, the exposure value will be increased like 1:2:4:8:16…., always in multiple.
 
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.
 
Look at those density values above, from number 100 to 3.125, the ratio is 32:1. The exposure latitude in this ratio is exactly included in the photosensitive range among in color negative, black/white negative, color reversal film and CCD. We’ll see that 17.68 is just right in the middle of those series of numbers. Thus, it will be excellent and precise to take 17.68 (approximation of 18%) as a base value, which controls the exposure value, photographic density and color balance.
 
In manufacturing of photosensitive products, 18% grey had become a standard in theory because of its special characteristic. 18% grey as a foundation used in the photographic sensitivity of the film, the exposure value of exposure photometer, CCD and CMOS sensors.

Specification:
 

Gray side: Reflectance 17.8%; Density 0.74
White side: Reflectance 92.0%; Density 0.036
Max. Deviation of reflectance: 2%
Max. Error in exposure measurements: 1/8 of F-stop
Card sizes: 4"x6"and 6"x8"
Core material: high density paper based composite
Gray side material: special paper with spectrally flat 18% coating
White side material: special paper with spectrally flat 18% coating

 

Package Contains:

• 4"x6" Grey/White Card x1 
• 6"x8" Grey/White Card x1
• English User Manual (A CD Card) x1
• Original Manufactory Package

 

 

Shipping term:

è      All items are directly shipped out as “gift” by normal international airmail via SwissPost Office (http://www.Swisspost.com).  It normally takes approximately 7-21 working days for arrival.  

è We will ship the item to you within 3 business days after clearance of payment.

è Items will be delivery by HongKong post .And the following list is the approx delivery time:

Country

Approx Delivery time

United States/United Kingdom/Australia

10-21 Working days

CanadaSpain

10-21 Working days

Brazil/South/America/Russia / Ukraine

May take up to 5-7 weeks due to strict Custom Inspection

France/ Turkey/Germany/Eastern Europe

May take up to 5-7 weeks due to strict Custom Inspection

 

No Tracking Number.

You can choose registered post with tracking number provided by paying an extra US$3.00 for the postal insurance. It is highly recommend the buyer to pay insurance (send by registered mail) if the buyer want tracking number.
We are not responsible for any loss in the mail if the item is not insured (non-registered mail).

 

è We only ship the item to the address listed according to paypal payment information. Buyer should make sure shipping address is correct.

 

Payment:

è We accept PayPal only.

è All payments are expected within 5 days after the last winning auction is closed. All unpaid auction will be forfeited.

è By bidding on our auction, we will assume that bidder had accepted our terms & conditions.

Return Policy:

è No refunds are offered. Only defective product will be offered exchange or store credit.

è Defective products must be returned within 30 days from the date you placed your order and It may take up to 3 business days to process your return after we receive your product.

è Warranty only apply on the stated warranty period products.

è Warranty is void if the products has been improperly charged,installed or misused in any way, or if the label and/or bar coded warranty label has been removed or tampered with.

è Where applicable,all requests for warranty returns must be accompanied by a proof of purchase and be made through the dealer or outlet where the products was  originally purchased.

è All shipping and handling cost will not be refunded.

è We are not responsible for any custom duty or import tax.

Evaluations:

 

è When we receive the evaluations we will do the same to you.

 

è If you judge us negative, please connect us before leaving evaluation.

 

è If you are not satisfied with the items for any reason , Please feel to contact us. We will respond within 24 hours,Please do not hide your email address when sending messages. Email sent through eBay's "Ask seller a question" link or ebay "My Messages" have the option to hide your email address. If we do not have your email address, we will not be able to respond, Feel safe shopping with us!

 


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