On 3-02-2002 at 11:47 [EMAIL PROTECTED] (Familie Scheffler) wrote: > Hi Artur, > > would you like to explain "bracketing" and 18%-rule and "AutoBracketing > feature", please?!
Bracketing - suppose you're about to shoot a scene with difficult light or lot of contrasty elements or something. You're not sure what the final effect will be if you shoot the scene relying on parameters chosen by your camera. So you take several shots of the scene (usually two, three) - the first shot based on the camera reading, the next one(s) compensated. AutoBracketing - if you bracket manually, you have to set different parameters for each shot with by yourself and this is time-consuming. When using the AutoBracketing feature, the camera sets all the compensations for you - you only have to set the "range", increments and "direction" for it (which is usually done with one or two simple moves) and then just press the button. The MZ-5n provides the AutoBracketing feature - three consecutive exposures can be done within the range of compensation of +3 to -3 EV and with 1 or 0,5 EV increments. It is controlled by two switches on the left side of the control panel. 18% grey rule - each and every built-in light meter is calibrated in a certain way. It assumes that the measured light is reflected by elements of average tonality - 18% grey. Thus, if the photographed scene consists of such elements, or of both the dark and bright elements in about the same numbers (which is usually the case), the overall reflected light is close to the average level and the metering is correct. However, if the scene is dominated by the bright or dark elements, the final reading will be incorrect because the meter will be fooled - it will underexpose in case of bright elements domination and overexpose in case of dark elements domination. In other words, it'll make white snow as well as black cat appear grey. The solution is to compensate for the bright or dark elements - in "+" in the first case, in "-" in the second case. This rule applies to each metering system. However, matrix metering tries to simplify our life and compensate for such cases. Unfortunately, the matrix algorhytms aren't perfect and are also often fooled this way. Thus their exposures should be bracketed (or AutoBracketed:)) in case of difficult scenes, at least until the matrix behaviour is fully known to its user. HIH Greetz Artur ----------------------------------------------------------------------- Harry Potter vs Henryk Portier. Kto wygra? Kliknij! < http://www.harry.wp.pl > - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
