Re: [ATM] Betr.: 48" Dob at OMI

[Alexis Cousein <al@sgi.com>]

Scope Builder wrote:
> Hold on a second!   I guess you lost me.
> 
> I thought that a 48" mirror collected more light to make things brighter, so 
> that your eye could see them better, and pick out more details.  Versus an 
> 8" mirror, it's collecting 36 times more light.  Regardless of what you are 
> looking at, 36 times more light = brighter.
> 
> Lets compare apples to apples.  If you are viewing the Lagoon Nebula at 50x 
> in the 8" and at 50x in the 48", 

The thing is that you *can't* look at 50x in the 48" and use all of the
aperture. By definition the exit pupil will be almost one inch, and
your pupil will be only 7mm large...


-- 
Alexis Cousein                                  al@sgi.com
Senior Systems Engineer/Solutions Architect     SGI/Silicon Graphics
--
<If I have seen further, it is by standing on reference manuals>

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