"How many people use spot meters versus incident/reflected?"
"What kind of meter do you use with your LTM?"
The question should have been worded, "How many people use a spot metering pattern versus some other metering pattern such as averaging, center-weighted, or matrix?"
Incident and reflected light meters are the two most popular types of light meters.
Incident light meters, also called illumination meters, measure the amount of light coming from a light source. Incident light meters are good for studio work, close-up work, and uniformly illuminated subjects or scenes.
Reflected light meters, also called brightness meters, measure the amount of light coming from a subject. Reflected light meters are good for distant scenes (such as landscapes), scenes that include a light source (such as scenes that include the sun or street lights), subjects that are light sources (such as the moon or a sunlit stained glass window), subjects that are unapproachable (such as a wild animal), and subjects or scenes that are not uniformly illuminated (such as stage performers lit by spot lights).
The light meters built into most modern cameras are reflected light meters. These built-in reflected light meters offer a choice of different metering patterns.
a. Averaging—measures the entire scene
b. Spot—measures a small area of the scene (usually a 1º to 5º angle-of-view)
c. Center Partial—measures only the central portion of the scene
d. Center Weighted Averaging—measures the entire scene but emphasizes the central portion of the scene
e. Bottom Weighted Averaging—measures the entire scene but emphasizes the lower portion of the scene
f. Multiple Spot Averaging—measures and averages a number of spot readings from different portions of the scene. Some cameras may average as few as three spot reading to more than fifty.
g. Multiple Zone Averaging (also called Multiple Pattern Averaging, Honeycomb Pattern, Evaluative Metering, Multi-Segmented, Matrix Metering, Multi, Zone, and Evaluative)—evaluates and averages multiple readings of different portions of the scene
Hand-held light meters may be incident and/or reflected light meters. Those that are reflected light meters most likely use averaging, spot, or multiple spot metering patterns.
So, in answer to the questions in this old thread, for my cameras that offer spot, center-weighted, or multiple zone, I usually select multiple zone. For those that offer spot, center-weighted, or averaging, I usually select center-weighted. For those that do not have a built-in light meter, I usually use a handheld reflective light meter when shooting outdoors. When shooting under studio conditions, I usually use a handheld incident light meter because I do not want my meter reading to be influenced by the color of the subject and/or background.
The only time I use a spot meter is when I am shooting theatre and cannot jump up on the stage and take an incident reading while standing next to the performer.
By the way, what is an "LTM?"
Light Meters by
Narsuitus, on Flickr