Ricoh Flash Technique Advice?

[abluesky]

I'm trying to make good use of the fill flash, but I am coming up with inconsistent results.
Inspired by this thread: http://www.dpreview.com/forums/post/52172384

Here is the chart from Imaging Resource I've been trying to makes sense of, but can't seem to reproduce real world results: http://www.imaging-resource.com/PRODS/r ... rFLASH.HTM

And I've been trying to apply the principles in this article: http://jpgmag.com/stories/16072

Any advice or guidance will be greatly appreciated.

Thank you!

 

[autochrome]

First, you need to perform two steps:
1-framing you want for the desired photo, in automatic, measurement of exposure wide (weighted)
record the results (diaphragm and speed)
2-framing you want for the desired photo, in automatic, Measurement of reduced to the subject in the shade (spot)
record the results (diaphragm and speed)
if the difference between the two measures exceeds the tolerance of the sensor (in the past the exposition latitude of film)
it is impossible to properly render the highlights and shadows.
In this case a flash of deficiency will be welcome. But it will be necessary to align the two settings. (light of day * lightning bolt)
with a leaf shutter, the speed is indifferent.
By against the diaphragm necessary depends on the distance to the subject in the shade, and of the power of the lightning bolt. (That is to say of the GN)
in summary: the speed always be appropriate, but the opening used must be correct at the time for the lighting of the day and the accent lighting of the flash.
It will therefore adjust this accent lighting in seeking an adequate opening, or by varying the distance of the subject in the shade,
or by varying the power of the lightning bolt (if your flash allows) or even the three has the times !
The subject in the shade can be a little under exposed ,for the aesthetics,but not on-exposed!
good shots !

 

[abluesky]

Thank you! Merci beaucoup

Very thorough and interesting!

Questions:

A. after calculating the difference between (1) & (2) how do I know if the difference exceeds the tolerance of the sensor? ISO? can I raise the ISO?

B. How to calculate the correct aperture for both the lighting of the day and the subject?

Merci beaucoup encore!

 

[autochrome]

hi !
A/the difference between the values (1) and (2) is visible with the histogram curve, if your camera can display,
because what is outside of the histogram curve will not be recorded by the camera.
In the case or it may not the dump, Take a series of photos framed fixed (on tripod) of a subject sunny which includes areas in the shade , by making first a normal exposure weighted,an second, then a series of images by applying a correction of gradual exposure certainy know well in over-exposure that under-exposure; in this way you will be able to see clearly from what value over or under-exposure the detail are no longer visible in the high lights and in the shadows; the gap between these two value, that is exactly the fitting tolerance of your sensor; this fitting tolerance is in general very superior on a sensor of larger size than on a smaller.
nota:this value depend also with ASA value.

B/the value of opening a apply is not unique, all values of openness which are correct simultaneously for the two lights used (day light + flash) will be usable. Only the depth of field will vary.

good shots !