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6 Days Ago - 1 Like   #1
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18% Grey?

Is the background color of the current Ricoh Pentax lens packaging box the 18% neutral grey as in a "grey card".

6 Days Ago   #2
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QuoteOriginally posted by doc58bc Quote
Is the background color of the current Ricoh Pentax lens packaging box the 18% neutral grey as in a "grey card".


I don't have a lens box, but if the lens packaging is similar to the box my KP came in it's probably too shiny (reflective) to be a reliable grey card ... I can't find an old grey card to compare the actual colour, but I remember them being relatively matt finish.
6 Days Ago   #3
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QuoteOriginally posted by doc58bc Quote
Is the background color of the current Ricoh Pentax lens packaging box the 18% neutral grey as in a "grey card".
No...about a stop lighter.


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6 Days Ago   #4
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I have a Kodak gray card from back in the day. If you look at the 'proud owner' graphic in kypfer's post above, the gray just to the right of the 'S' in 'istDS' is about the same to my eye. However, this comparison is affected by the brightness setting on my monitor and the illumination falling on my gray card. So, may not be that helpful.

4 Days Ago   #5
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A table of zones. Zone V represents 18% reflective - generated using html table tags, function hsl(0, 0%, 50%).



Of course on a display lightness may be off.
4 Days Ago   #6
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QuoteOriginally posted by doc58bc Quote
18% Grey?
Why not just use a X-Rite ColorChecker Passport, got all the bases covered then.
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QuoteOriginally posted by Kerrowdown Quote
Why not just use a X-Rite ColorChecker Passport, got all the bases covered then.
$$$


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4 Days Ago   #8
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QuoteOriginally posted by Apet-Sure Quote
However, this comparison is affected by the brightness setting on my monitor and the illumination falling on my gray card. So, may not be that helpful.
Monitor color balance is another consideration. For most purposes, it is best to not directly compare reflected and emitted light when doing a technical evaluation. That said, the meters on our Pentax dSLRs are calibrated against a standardized light source, but evaluated against 18% gray for CIPA certification.


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QuoteOriginally posted by stevebrot Quote
$$$Steve
Aye I guess... but if colours and balance are important, it's a great wee tool for getting the job done.
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QuoteOriginally posted by doc58bc Quote
Is the background color of the current Ricoh Pentax lens packaging box the 18% neutral grey as in a "grey card".
No it isn't.
4 Days Ago - 1 Like   #11
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I think the OP simply wanted a general idea of what 18% gray looks like. The chart by acoufap above does a nice job of this IMO. Not all questions need a deep technical answer.
4 Days Ago   #12
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QuoteOriginally posted by Apet-Sure Quote
Not all questions need a deep technical answer.
It's a bit off topic, but thanks for the reminder. I really need to apply this pearl more often in my other life.
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QuoteOriginally posted by Apet-Sure Quote
Not all questions need a deep technical answer.
True - but giving one can often lead to a more informative, wider ranging discussion. OTOH, the person who asked may just give up in frustration !
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Wow! ............. A lot of answers for the original question.

Something though I have to respond to is that a monitor is NOT a reflectance standard and can't be compared to a gray card. A gray card REFLECTS a given percentage of the light striking it and takes on a color cast depending on the ambient light (it exhibits a "self-adjusting" color temperature). No monitor should ever be used as a gray card. Color reference, yes. Gray card, no way.

If one wants a fair gray card substitute on the cheap (maybe not so cheap), RUST-OLEUM Satin Granite (for those in the US) sprayed on a white base (3 coats) comes close. It's a bit more shiny than a gray card, but again it's pretty close and has great neutrality (equal reflectance of all colors).

I think the OP just wanted a quick gray card substitute but I could be wrong.
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QuoteOriginally posted by Bob 256 Quote
Something though I have to respond to is that a monitor is NOT a reflectance standard and can't be compared to a gray card. A gray card REFLECTS a given percentage of the light striking it and takes on a color cast depending on the ambient light (it exhibits a "self-adjusting" color temperature). No monitor should ever be used as a gray card. Color reference, yes. Gray card, no way.
Thanks for expanding on what I added as an aside. I particularly appreciate the note regard color temperature. People tend to use use something white for in-camera custom white balance when a gray card would be much more appropriate.


Steve
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