On Feb 23, 2011, at 9:49 PM, Darren Addy wrote: >> 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, > I appreciate your replying to my request for input. However, I might > suggest that your cars are slightly less challenging than a magnitude > -5 dot traveling in low earth orbit at 17,200 mph (from a tripod or > not) with regard to sharpness and SR effect. I
All things being equal, shake reduction, tripod, focal length and shutter speed, shake should be equal whether you're shooting a car or a space station. Of course, you might get motion blur with a moving object, but the degree of shake should be the same. In fact, any lens shake will be magnified when shooting something that's closer to the lens. And in regard to motion blur, at the shutter speed you cite, I can't imagine that it will be a factor. In any case, I don't mean to be argumentative, just helpful. And I look forward to seeing your photographs. Paul > 'll have some results to > show sometime tomorrow, but I don't think I'm terribly happy with the > SR-on shots. Will try again next time without. > > For the record, I was pretty happy with a star image I shot before the > ISS appeared, and I taped the lens so it could not move focus from > that spot. I was slightly surprised to find it was exactly at the spot > designated for infinity by the Tamron SP. > > -- > 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.
