Yes it is, but I prefer as I first learned ASA as they are the same
While looking this up to be correct, I found a problem with Dentists
Dental Radiography: Doses and Film Speed
Tin Can
From the Pentax Spotmeter manual:
"When taking black-and-white pictures of a colored subject, you know that the areas adjacent to each other having little difference in light reflection, although different in visible colors, will not be reproduced on the film in proper contrast. In such a case, a proper filter is selected and used to properly reproduce the contrast.
It is difficult, however, to select a proper filter to be used for that purpose. The Asahi Pentax Spotmeter helps select proper filters. Put the filter over the objective lens of the Spotmeter and read the difference in the L.L. readings.. . use different filters until the difference in the L.L. readings (contrast) of the picture areas in question will become greatest. Select that filter which gives the greatest difference in the L.L. readings to properly reproduce the contrast.
The Spotmeter will also help correct illumination not only in color but also in black-arid-white photography. The reproducible contrast of a picture area is limited within a certain range as stated earlier. The Spotmeter readings of the various important picture areas will indicate which areas should be additionally illuminated."
In other words, just put the filter in front of your meter.
If you happen to disagree from experience; then compensate accordingly.
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Niels
nitoplait - that odd advice has little or nothing to do with conventional filter factors, but about manipulating overall contrast through specific filter selection. Perhaps there was some application in black and white movie or TV studio sets where that method was hypothetically used, but I've never heard of anyone doing it in still photography where simple development changes work best.
Flickr Home Page: https://www.flickr.com/photos/alanklein2000/albums
One of my favorites is in Weston. lol
And one of my favorite lens/shutter is in US stop.
A couple of time mine were in twenty-something degrees Fahrenheit, when I accidentally dropped the meter is snowmelt streams.
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