[pure-silver] Re: Densitometer
- From: "Ralph W. Lambrecht" <info@xxxxxxxxxxxxxxxx>
- To: PureSilverNew <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 14 Apr 2006 01:07:55 +0200
In addition, you can use the Stouffer step wedges to calibrate your darkroom
meter to read densities.
Regards
Ralph W. Lambrecht
http://www.darkroomagic.com
On 2006-04-14 00:31, "Richard Knoppow" <dickburk@xxxxxxxxxxxxx> wrote:
>
> ----- Original Message -----
> From: "Justin F. Knotzke" <jknotzke@xxxxxxxxxx>
> To: <pure-silver@xxxxxxxxxxxxx>
> Sent: Thursday, April 13, 2006 11:20 AM
> Subject: [pure-silver] Densitometer
>
>
>>
>> Is there anyone on the list who had a Densitometer who'd
>> be willing
>> analyze a roll of 120 film for me? Or, is there a shop
>> where you can
>> send your negs to who will analyze them?
>>
>> Thanks
>>
>> J
>>
>> --
>> Justin F. Knotzke
>> jknotzke@xxxxxxxxxx
>> http://www.shampoo.ca
>>
>
> In liu of a densitometer its not difficult to estimate
> the density using a step wedge. The eye is pretty good at
> matching brightness on a side by side basis. Good step
> wedges are available from Stouffer for around $10 each US.
> You don't need the more expensive "calibrated" versions.
> For a very rough estimate you can use the Kodak rule for
> roll and sheet film that is on a clear support. Place the
> negative on a sheet of printed paper, a book for instance.
> If the negative is for printing with a diffusion source the
> densest highlight that is to have detail should be just
> dense enough to block out the type. For a negative that is
> for printing on a condenser source the same highlight should
> be transparent enough to just allow seeing the type through
> it. The shadows that are to have detail should have that
> detail visible.
> One can even get a rough estimate of density by
> comparison with a Kodak Projection Print Scale although they
> are quite variable one to another. This scale is an actual
> silver transparency while some others are half-tone ink
> dots, the latter are useless for anything.
>
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
>
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