[AZ-Observing] Re: APOD picture of the duh Peaks

 
I wouldn't be so quick to conclude that the image must be a composite. The  
premise that you can't go that deep without trailing the foreground no longer  
applies. Modern DSLR's can produce very sharp images at exceedingly high  
ISO's. The Nikon D3 can shoot at ISO 6400 with amazing sharpness. You can even  
bump it up to an ISO of 25,600 and get good results. If the image was shot on a 
 
pro DSLR by somebody who knows their way around CS3, I could believe it being 
 the edited version of a single exposure.
 
Bill in Flag
 
In a message dated 4/16/2008 6:24:15 PM US Mountain Standard Time,  
bas@xxxxxxxxxx writes:
It's just occurred to me that the Duriscoe shot of the  Peaks
_must_ be a composite.  The reason simply is that Earth still  spins:
you can't get a sky shot that deep without having the  foreground
smeared out from trailing at least a little bit.  So there  might
be just two shots taken back-to-back---maybe the slight trace  of
illumination on the cloud-cap isn't from the east side of  Flagstaff,
but instead from a bit of morning  twilight.








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