Yes, but just to clarify, what I posted regarding the relationships of the handheld shutter speeds needed for APS vs. FF sensors is still true with IS/SR, assuming both the APS and FF cameras have same IS/SR performance characteristics, its just everything shifts downward to slower overall shutter speeds being usable... You will still need 50% faster shutter speed on a APS camera with IS as you would on a FF camera with IS with same focal length in mm lens. Only if you use a shorter lens to get same AOV would the APS camera be able to use same shutter speed as the FF camera, even with IS (on both APS and FF cameras). And YES, IS essentially throws the old 1/focal length rule out the window, its probably more like 4.5/focal length in mm for FF and 3/focal length in mm for APS, assuming about a 2 stop improvement (~ 1/4 as fast shutter speed needed without IS) due to the IS. JCO
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Paul Stenquist Sent: Wednesday, November 29, 2006 6:12 AM To: Pentax-Discuss Mail List Subject: Re: Reciprocal of the Focal Length with DSLR I agree. As a long lens shooter who has worked a lot in handheld situations, I have found this to be the case. It is significantly harder to handhold a 400mm lens at 1/500th with my D than it was with my LX. Of course, shake reduction has changed all that completely. Paul On Nov 29, 2006, at 3:57 AM, J. C. O'Connell wrote: > The way I analyze it, my conclusion is as follows: > > Its all about angles --- > > If you use the same focal length in mm lens, the image > will show more blur relatively speaking with > the current DSLRS because you are only using > a smaller portion of the image circle and magnifying > it more than with with FF. > > If you use same AOV focal length with the DSLRS > then the blur is relatively the same as it would > be with the longer lens on FF. > > To sum it up, if you use the old 1/focal length > rule as your minimum speed for FF, then you would need > to use a new 1/(focal length * 1.5) for the smaller > than FF sensored current Pentax DSLR bodies. i.e > you need a faster shutter speed with these DSLR to compensate for the > narrower AOV/higher magnification. > > jco > > > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf > Of Roman > Sent: Wednesday, November 29, 2006 3:34 AM > To: [email protected] > Subject: re: Reciprocal of the Focal Length with DSLR > > > http://roman.blakout.net/?blog=20060510145807 > > ^^^ This one here is 1/80 at 270mm, but admit, a lucky occasion. 200mm > is still 200mm, it's only a cropped sensor that make FOV narrower than > 35mm full-frame. That's the way I see, and with good grip and steady > hand you can try shooting 1/300 at 200mm, but I try double focal > length for sure shots, e.g. 1/500 for 200mm or so... > > Roman. > > was: > > Joseph Tainter <[EMAIL PROTECTED]> > Subject: Reciprocal of the Focal Length with DSLR > > > Considering the > crop/magnification factor of the Pentax DSLR's, a 200mm lens = a 300mm > lens (Let's not get into the argument about this, please). So, would > one ideally shoot at 1/300 second hand held? > > -- > new photos ever so often... <http://roman.blakout.net/> > > -- > 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 > -- 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
