Spot Meter Measurment of Transmission Densities by R, Eugene Smith

[dr bob]

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(there was a url link here which no longer exists) - Spot Meter Measurment of Transmission Densities by R, Eugene Smith

By R, Eugene Smith (Dr. Bob)

. INTRODUCTION

All serious photographers using classical materials have at some time found it desirable to produce a film response curve, to check film speed variance of their equipment, materials, and/or developing techniques. This usually dictates the use of a densitometer. A good densitometer can significantly impact the budget and Ansel Adams indicated that although most photographers do not possess a densitometer, “...it is well worth the effort to...

(there was a url link here which no longer exists)

 

[tcullen]

Is there a published of reflective densitometer values or ranges that correspond to Zones?

 

[ic-racer]

Good technique. Everyone should know how to do this. I used to do the same before I got my densitometer. Of course now days a densitometer can be found for a fraction of the price of a spot meter

On a related note, anyone needing to find 0.1 for film speed tests can use just about any meter (doesn't need to be a spot meter) and just hold the film over the sensor. Look for a 1/3 of a stop drop in the reading.

 

[Louis Nargi]

This seems like something I'LL try.

 

[naeroscatu]

Thanks Dr. Bob, I was actually struggling to get decent results using a scanner as densitometer but I got confused due to the formula there containing three variables. This method seams straight forward and is close enough to the densitometer measurements. What a relief...