On Feb 23, 2011, at 7:25 PM, Darren Addy wrote: > the 1/focal length rule really only applies to film/4x6 prints.
The focal length is the focal length, regardless of format. And the shutter speed is the shutter speed is the shutter speed. Film vs. digital is definitely not a factor here. It's true that shake will be magnified on a larger print, but the 1/shutter speed suggestion is still generally accurate. And that "rule" is meant to apply to handholding. On a good tripod, any movement will be far below the critical threshold, even at a considerably slower shutter speed. But using shake reduction won't cause any problems. In literally thousands of long lens car pics that have to be critically sharp, I've found that on or off, shake reduction makes no difference. And I can easily achieve critical sharpness with a 250mm lens at 1/60th shutter speed -- on the tripod. Paul > If you > are going to crop (like I will have to on this baby) I assure you that > shutter speed alone may not be enough. I'm going to shoot with SR on. > > On Wed, Feb 23, 2011 at 5:44 PM, Paul Stenquist <[email protected]> > wrote: >> I've shot off the tripod both with shake reduction on and off. Doesn't seem >> to make a difference. But you definitely don't need it at 1/2500th. Mirror >> slap is not a factor either. Hell, mirror slap isn't a factor at anything >> over 1/125th or so. >> Paul >> On Feb 23, 2011, at 5:36 PM, Darren Addy wrote: >> >>> This may seem like a silly question, but... >>> I'm going to try to take a handheld image of the ISS (International >>> Space Station) on a flyover tonight. It goes darn near directly over >>> the top of me and is early enough that I should be able to get it for >>> almost it's entire arc of the sky. After doing some research, it >>> appears that you need a darn fast shutter speed to freeze the motion >>> of the thing, as it is really cooking along. I will be trying it with >>> my Tamron SP 500mm mirror lens. >>> The exposure I will be attempting will be 1/2500 @ f/8 ISO: 3200 on my K-x. >>> >>> I won't be able to use the mirror-up/self-timer so there will be >>> mirror slap followed by a 1/2500th exposure. Does anyone have any data >>> (or opinions) on whether shake reduction should be ON or OFF? >>> >>> (Even at an equiv. 750mm focal length, this is like shooting a >>> slightly large STAR. It is going to be small in scale to the frame). >>> Thanks for any input. I've got about 2-1/2 hours till flyover. >>> >>> -- >>> PDML Pentax-Discuss Mail List >>> [email protected] >>> 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 >> [email protected] >> 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 > [email protected] > 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 [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
