Re: Something of interest from his Thomishness
Interesting read. I only use my VR on my Nikon lenses below 1/250. Really saves on batteries. Dave On Tue, May 4, 2010 at 9:57 PM, William Robb wrote: > This is eerie. > http://is.gd/bUqH3 > And safe to read. > It's off Thom Hogan's Nikon thingie (note spelling please Tanja), but it > seems applicable to Pentax as well. > > William Robb > > > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. > -- Documenting Life in Rural Ontario. www.caughtinmotion.com http://brooksinthecountry.blogspot.com/ York Region, Ontario, Canada -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Something of interest from his Thomishness
On Wed, May 5, 2010 at 10:36 AM, Miserere wrote: > I have found my K10D's SR to be useful when hand-holding my 600mm > mirror lens, but much less useful than at lower focal lengths. I would expect that at the longest focal lengths, the system just can't move the sensor fast enough to keep up. (Either because of lag in the system, or because the actuators can't apply enough force.) -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Something of interest from his Thomishness
On 5 May 2010 08:45, Graydon wrote: > > I think it's pretty much good for user-induced shake all the time. > (800mm mirror lens hand-held, for example.) It's a question of when the > user-induced shake is the dominant contributor to the image being > blurry, and if it's useful then. (so far as I can tell, if you get to > 1/15, the answer is no, because the amplitude of the shake is too big in > relation to the shutter speed.) > > -- Graydon I have found my K10D's SR to be useful when hand-holding my 600mm mirror lens, but much less useful than at lower focal lengths. With a 50mm lens I can consistently shoot sharp at 1/10s (which is about 3 stops of "help"), but with the 600mm I can't go much slower than 1/400s or so (which is about 1 stop of "help"). I keep meaning to test setting the SR to 800mm when using the mirror lens to see if that improves things. Cheers, --M. -- \/\/o/\/\ --> http://WorldOfMiserere.com http://EnticingTheLight.com A Quest for Photographic Enlightenment -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Something of interest from his Thomishness
On Wed, May 05, 2010 at 08:29:51AM -0400, Doug Franklin scripsit: > On 2010-05-05 1:49, Larry Colen wrote: > >I've not actually done any comprehensive tests. I also always figured > >that at high shutterspeeds there'd be little enough range of movement > >that SR being on or not would be moot. > > I haven't specificially tested for it, but I have done spot checks, > and it appears, without the scientific rigor, that SR on the K10D > has had a positive effect on my hit rate while panning at shutter > speeds up to 1/250 and focal lengths up to 400mm. It doesn't do > much for the direction I'm panning (horizontal) but definitely seems > to help with the vertical. This is based on some very informal > head-to-head testing I did with the *ist D and K10D when I first got > the K10D. I think it's pretty much good for user-induced shake all the time. (800mm mirror lens hand-held, for example.) It's a question of when the user-induced shake is the dominant contributor to the image being blurry, and if it's useful then. (so far as I can tell, if you get to 1/15, the answer is no, because the amplitude of the shake is too big in relation to the shutter speed.) -- Graydon -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Something of interest from his Thomishness
On 2010-05-05 1:49, Larry Colen wrote: I've not actually done any comprehensive tests. I also always figured that at high shutterspeeds there'd be little enough range of movement that SR being on or not would be moot. I haven't specificially tested for it, but I have done spot checks, and it appears, without the scientific rigor, that SR on the K10D has had a positive effect on my hit rate while panning at shutter speeds up to 1/250 and focal lengths up to 400mm. It doesn't do much for the direction I'm panning (horizontal) but definitely seems to help with the vertical. This is based on some very informal head-to-head testing I did with the *ist D and K10D when I first got the K10D. -- Thanks, DougF (KG4LMZ) -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Something of interest from his Thomishness
Quite interesting. Yes it was an exercise to read. The false-negative bit re. tripod use was interesting also. On Wed, May 5, 2010 at 12:47 AM, Rob Studdert wrote: > On 05/05/2010, William Robb wrote: >> This is eerie. >> http://is.gd/bUqH3 >> And safe to read. >> It's off Thom Hogan's Nikon thingie (note spelling please Tanja), but it >> seems applicable to Pentax as well. > > The response of the movement sensors used in the Pentax bodies is no > where near as fast as 1kHz (though I suspect he's interpreting this > data incorrectly), basically they can detect sway and a certain degree > of jolt. Like Thom suggests there is a definite shutter speed limit to > which SR is useful, pointed out fairly eloquently by Falk Lumo on the > Pentax web forums. It's useful but it's no panacea and really I don't > think I'd miss it at all moving to a camera like the D700. > > -- > Rob Studdert (Digital Image Studio) > Tel: +61-418-166-870 UTC +10 Hours > Gmail, eBay, Skype, Twitter, Facebook, Picasa: distudio > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. > -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Something of interest from his Thomishness
Falk Lumo has posted an article about it on his blog too: http://falklumo.blogspot.com/2010/04/pentax-shake-reduction-revisited.html It's a bit tough on the braincells, but quite interesting. For the math challenged like myself, here's the conclusion: "Pentax delivers a capable shake reduction system able to provide up to 4 stops stabilization. However, it is designed to work best at exposure time around 1/20s and therefore, is most useful for normal and wide angle lenses used at low light or in video. Starting at around 100mm focal length, it is increasingly unlikely to see a positive effect from the SR system and beyond 200mm, the SR system cannot be used anymore to produce tac-shap images at lower than usual exposure times." Sadly, this matches my own experience pretty well. :-( Jostein 2010/5/5 Rob Studdert : > On 05/05/2010, William Robb wrote: >> This is eerie. >> http://is.gd/bUqH3 >> And safe to read. >> It's off Thom Hogan's Nikon thingie (note spelling please Tanja), but it >> seems applicable to Pentax as well. > > The response of the movement sensors used in the Pentax bodies is no > where near as fast as 1kHz (though I suspect he's interpreting this > data incorrectly), basically they can detect sway and a certain degree > of jolt. Like Thom suggests there is a definite shutter speed limit to > which SR is useful, pointed out fairly eloquently by Falk Lumo on the > Pentax web forums. It's useful but it's no panacea and really I don't > think I'd miss it at all moving to a camera like the D700. > > -- > Rob Studdert (Digital Image Studio) > Tel: +61-418-166-870 UTC +10 Hours > Gmail, eBay, Skype, Twitter, Facebook, Picasa: distudio > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. > -- http://www.alunfoto.no/galleri/ http://alunfoto.blogspot.com -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Something of interest from his Thomishness
On May 4, 2010, at 6:57 PM, William Robb wrote: This is eerie. http://is.gd/bUqH3 And safe to read. Interesting. He *seems* to know his stuff. I also peeked at a couple of his other pieces. Is he the person that Kennyboy thinks he is? It's off Thom Hogan's Nikon thingie (note spelling please Tanja), but it seems applicable to Pentax as well. A lot of it seems to, though with Pentax the stabilization is at the end, rather than in the middle of the optical path, so it wouldn't affect bokeh and the like. I've not actually done any comprehensive tests. I also always figured that at high shutterspeeds there'd be little enough range of movement that SR being on or not would be moot. -- Larry Colen l...@red4est.com sent from i4est -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Something of interest from his Thomishness
On 05/05/2010, William Robb wrote: > This is eerie. > http://is.gd/bUqH3 > And safe to read. > It's off Thom Hogan's Nikon thingie (note spelling please Tanja), but it > seems applicable to Pentax as well. The response of the movement sensors used in the Pentax bodies is no where near as fast as 1kHz (though I suspect he's interpreting this data incorrectly), basically they can detect sway and a certain degree of jolt. Like Thom suggests there is a definite shutter speed limit to which SR is useful, pointed out fairly eloquently by Falk Lumo on the Pentax web forums. It's useful but it's no panacea and really I don't think I'd miss it at all moving to a camera like the D700. -- Rob Studdert (Digital Image Studio) Tel: +61-418-166-870 UTC +10 Hours Gmail, eBay, Skype, Twitter, Facebook, Picasa: distudio -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Something of interest from his Thomishness
A useful read. Of course it does confirm my prejudices.
On 5/4/2010 9:57 PM, William Robb wrote:
This is eerie.
http://is.gd/bUqH3
And safe to read.
It's off Thom Hogan's Nikon thingie (note spelling please Tanja), but
it seems applicable to Pentax as well.
William Robb
--
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New;}}
\viewkind4\uc1\pard\f0\fs20 I've just upgraded to Thunderbird 3.0 and the
interface subtly weird.\par
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