For slide film just point the incident meter towards the camera...
Oh please! (#3)
The incident meter will give an average reading of light falling on the subject.
With slides, you main concern is not overexposing the highlights. The shadows will just have to fall where they will. There's not enough latitude in slide film nor can your vary development times to extend or reduce density Zone system style.
you might be better of to turn your fractions into decimals first,then average and turn the resultsback into the closest fraction ;good luck
With my spotmeter to average up to 9 1° spot readings you just press the average button, but this would do you no good at all in this case because with slide film to do what you suggest you will most probably find that that the difference between the the darkest shadow and the brightest highlight is too great for the film to be able to record because of the restricted latitude of slide film (about 2 1/2 stops) , there are two options I.M.O (1) spot meter the brightest highlight and let the shadows find their own level, or (2) take an incidental light reading.
The problem with averaging several important areas of subject matter, especially with an unforgiving medium like slide film, is that you may end up with none of them being exposed as you like.
With black-and-white film, one "pegs" to the shadows. One develops and/or prints to get desired contrast.
For color negative films, the same thing, but with more limitations, applies.
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