Re: [OM] IMG: Sunrise, Moonset

[Chuck Norcutt]

While it's certainly adjustable it's definitely not arbitrary.  The 
required resolution depends ultimately on print size, viewing distance 
and (especially in the case of Moose) human visual acuity.  If you want 
every dot resolved on an 8x10 print at 300 dpi you need to resolve 50 
lines/mm (which actually means line pairs).  You probably can't do that 
without a solid tripod.
Chuck Norcutt


On 10/24/2014 12:53 PM, Mike Lazzari wrote:
> > I have never used an "arbitrarily defined spread" and neither should
> > you.  I compute my own CoC and get exactly what I want.
> It's "arbitrary" in the sense that _you_ define it. (suggest a different
> word Piers)  I'm sure that you do not choose arbitrary criteria. I
> suspect Moose would choose different criteria. Surely we're not just
> throwing darts at a target. ... oops! Someone already did and engraved
> it on my lens!
>
> >   I can tell you that this Leica
> > scale assumes a resolution of approximately 30 lines/mm.  That's often
> > sufficient for me.  Want a more stringent parameter?  Shoot at one stop
> > smaller (f/11) while continuing to assume the 10 feet to infinity given
> > by f/8 on the scale.  That ups the assumed resolution value to 40
> > lines/mm.  Still not good enough. ....
> This very statement shows the arbitrariness... kinda like the adjustable
> wrench of the photographer's kit. However I would liken the ticks on the
> lens to an adjustable wrench with the thumb wheel welded in place.
>
> Mike
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