It is a great tool. Under certain circumstances you can get some extreme results. This (the fifth picture I made with K10D): http://i106.photobucket.com/albums/m265/dagthrane/_IGP0005.jpg
was made hand held at 1s exposure time with FA50mm @ 1:1.4. It´s not completely sharp, but it was a bit dark for the AF as well... This is a more realistic example, with DA70 at 1/15s and 1:2.4 and is very sharp: http://foto.no/cgi-bin/bildekritikk/vis_bilde.cgi?id=284758 DagT Den 15. jan. 2007 kl. 07.41 skrev Sandy Harris: > Pentax claim their shake reduction is worth "2.5 to 4 stops". Some > Canon ads describe some of their lenses as having "3-stop" or > "4-stop" IS. > > Are these claims anywhere near believable? What are actual users > of K100D or K10D finding? > > If those claims are real, then an F 2.8 lens with three-stops of extra > tolerance for low light will (in some ways) match an F 1.0 lens. Wow! > Even if it is only one stop, or 1.5, that's still a very useful gain. > > If Pentax's "2.5 to 4 stops" claim is accurate, then like a Sigma > 18-50/2.8 zoom (equivalent to 28-75 on 35mm) then becomes > awfully attractive. That one lens could handle nearly all of the > shots I take. > > If the claim is accurate, then even a fairly slow lens like the > Pentax 20-35 F4 becomes quite usable in low light. > > What if you use a fast lens? An F 1.2 prime plus the claimed 2.5-4 > stops gives F 0.5 or better. Even a 1.8 becomes remarkably good > in low light. > > Or is this all just too good to be true? > > Yes, I do realise that a shake reduction system will neither allow > fast > shutter speeds for stopping motion nor give the reduced depth of field > that a fast lens will. Also, that no magic is going to make a poor > lens > perform like a top-of-the-line one, or a zoom like a good prime, in > sharpness, color rendition, etc. > > But, given a decent lens, what sort of low light performance should > one expect? > > -- > Sandy Harris > Quanzhou, Fujian, China > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net DagT -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
