[alt-photo] Re: Densitometer vs Scanner

[Francesco Fragomeni]

Pierre,

Looks like we have the same densitometer. Mine is an 810 as well (at least
I think it is as thats sounds familar and I googled it and it looks the
same as mine. I'm not home at the moment to check but I'm 99% sure thats
what it is). It isn't entirely unusual to see a very slight variance in
readings and as Kevin said, it could be due to slight fluctuations in
voltage. From what I understand, Kevin is also right in that the
densitometer is reading to the thrid place and rounding up in the value
that it displays. This makes it more precise in its readings. If you
haven't calibrated it recently you should definitely do that. If you don't
have the calibration step tablet and ceramic plate, X-Rite will send you a
set for a price. I can't remember but when I replaced mine I think it was
around $200.

-Francesco

On Wed, Jan 4, 2012 at 9:57 AM, Kevin Morris <kmorris at stouffer.net> wrote:

> I believe all the X-rite 810 models only read to two places. If you are
> getting a reading of 1.20 and sometimes 1.19 or 1.21 your calibration step
> wedge could actually be reading to the third place such as 1.206 and
> rounding up to 1.21. The .01 shift could be attributed to slight voltage
> variances. Our 810 is usually very stable but it will occasionally vary a
> tiny amount. The X-Rite 310 that we use for most of our production is a bit
> more finicky. There are days that it will need to be calibrated after every
> sheet that is being density inspected.
>
> It is our rule to always check the calibration of the densitometer before
> a sheet of film is ever read.
>
> Kevin Morris
> Stouffer Industries
>
> -----Original Message----- From: Globe Trotteur
> Sent: Wednesday, January 04, 2012 11:42 AM
> To: alt-photo process-list
>
> Subject: [alt-photo] Re: Densitometer vs Scanner
>
>
> Well, when i sample a value with my densitometer, sometimes it gives me a
> value of 1.2 and sometimes 1.19 or 1.21. Is that normal? I have the X-rite
> 810. I need to recalibrate it too. have not dione that in a while.So if i
> have 4 patches that i am sampling and they vary with 0.01, should I assume
> that they have the same values? The scanner will assume that.Thanks.PO
>
>> Date: Wed, 4 Jan 2012 09:10:08 -0700
>> From: fdfragomeni at gmail.com
>> To: alt-photo-process-list at lists.**altphotolist.org<alt-photo-process-list at lists.altphotolist.org>
>> Subject: [alt-photo] Re: Densitometer vs Scanner
>>
>> I have both my X-Rite densitometer (can't remember which model but it is
>> both reflection and transmission) and the densitometer (which is produced
>> my X-Rite as well) in my Epson V750Pro scanner and while the Epson is a
>> great piece of technology and I love it as a scannner, my X-Rite
>> densitometer is a precision machine designed for one specific purpose and
>> I
>> carefully keep it calibrated. I trust my X-Rite densitometer far more then
>> I'd trust the densitometer in the scanner when it comes to the most
>> important things.
>>
>> If you have a trusted densitometer and you keep it calibrated I would
>> probably go with that one. The densitometer in the scanner is more then
>> capable and an excellent option for anyone who doens't already own a
>> trusted dedicated densitometer but it is just a different piece of
>> technology and is not a dedicated and maintained device (meaning you
>> actively keep it calibrated in the same way that you would with a
>> dedicated
>> device). My $0.02, other's may have other opinions.
>>
>> -Francesco
>>
>> On Wed, Jan 4, 2012 at 8:33 AM, Globe Trotteur
>> <unglobetrotteur at hotmail.com>**wrote:
>>
>> >
>> > While calibrating the new Ilford Art paper, i tried both with my
>> > densitometer and my scanner. Now my question is, which one is more
>> > accurate.My X-rite densitometer is showing different values for pure >
>> white
>> > than the scanner does. It could be that the textured paper is affecting
>> > the
>> > readings.Which method should I trust more?Thanks.Pierre-O
>> >
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