>We can assume that Pentax knows that the bandwidth doesn't extend into > the frequency range of the vibrations caused by mirror/shutter actions > or the potentially relatively fast vibrations set up by buffeting > winds etc, hence their advisory.
This paper specifically states handheld vibrations. Kenneth Waller ----- Original Message ----- From: "Digital Image Studio" <[EMAIL PROTECTED]> Subject: Re: Pentax DSLR Shake Reduction Question - Why turn it off on whileon tripod? > On 14/01/07, J. C. O'Connell <[EMAIL PROTECTED]> wrote: >> Could somebody please explain the theory why >> the Pentax AS should be turned off while using >> a tripod?? >> >> I dont understand how it could hurt, >> and intutively it seems like It might help >> if the tripod isnt perfectly stable due to >> wind, camera mechanism vibrations, etc. > > It's speculative since the technical information is limited and no > users to date have shared any technical test results of the Pentax SR > systems response and sensitivity. The SR system is based around a set > of movement detectors (gyroscopic according to link below) and an > oscillating plate driven by linear motors which carries the sensor. > > As you would expect the system will have a limited response bandwidth > which may be a due to a combination of the speed of the SR processor, > movement sensors and the moving systems mass vs the motor response. We > can assume that Pentax knows that the bandwidth doesn't extend into > the frequency range of the vibrations caused by mirror/shutter actions > or the potentially relatively fast vibrations set up by buffeting > winds etc, hence their advisory. > > See: > http://www.pentaxslr.com/files/scms_docs//PENTAX_SR_Description_091506.pdf > > -- > Rob Studdert > HURSTVILLE AUSTRALIA > Tel +61-2-9554-4110 > UTC(GMT) +10 Hours > [EMAIL PROTECTED] > http://home.swiftdsl.com.au/~distudio//publications/ > Pentax user since 1986, PDMLer since 1998 > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
