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Forum: Pentax SLR Lens Discussion
08-17-2017, 09:39 PM
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Absolutely true that when going for blurring the background, the game changes depending on the distance of that background behind the subject, as well as the FL being used, and distance to the subject. Under some circumstances, a background will appear very blurred with an aperture of say f/4.5, while under other circumstances it will take f/2.4 or wider, with the subject filling the frame to the same degree. The older prime lenses of wide angle to mid FL or short tele, invariably had a very useful DOF scale right on the lens. Some still do.
Then there's a matter of refinement. Just how much blur is what you are looking for? Sometimes you want enough blur to make your subject stand out, but still have the background quite clearly recognizable. This would establish an environment that may be important to the context of your shot. On the other hand, you may want to make the background virtually disappear.
Compared to film use of olden days, practicing with a DSLR to get a good feel for results under varying conditions, and with various equipment, is much easier.
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