Re: [APML] To Push or Not To Push

[Wei-Hao Wang <astrophoto@gmail.com>]

Hi Wade,

It still depends what you really want.  If what you care is mid-tone 
density, then you could decrease exposure when you push.  Pushing
increases the density of mid-tone and highlight a lot.  Therefore 
decreasing exposure is not a bad thing to do if you care about 
accurate mid-tone density,  

On ther other hand, in most cases of deep-sky astrophotography, we 
hope bring out the weakest signal in the sky background, which is in 
the shadow.  In this case, exposing long enough is the key.  Pushing
helps us to do better, but it can never replace long exposure.

Cheers,
Wei-Hao


On 8/20/05, Thomas W. Earle <twade@bmi.net> wrote:
> Jerry,
> 
> I appreciate your expertise.  It appears, I have let my daylight
> photography expertise cloud my vision with respect to
> astrophotography (i.e. you can't compare apples to oranges).
> 
> It's apparent, I must calculate an exposure based on non-pushed
> film, but push it anyway.
> 
> Wade
> 
> 
> _______________________________________________
> Astro-Photo mailing list
> Astro-Photo@seds.org
> http://seds.org/mailman/listinfo/astro-photo
> 


-- 
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Wei-Hao Wang  :)

Institute for Astronomy at University of Hawaii

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