Re: Another OA Reflector

From: Ratboy99 (ratboy99_at_aol.comet)
Date: 10/08/04 

Date: 08 Oct 2004 17:35:43 GMT

Stephen Paul wrote:

>A well executed 3.6" OA should be stiff competition for a 100mm apo on a per
>unit of magnification basis.

No, a well executed 3.6" OA reflector should be stiff competition for a well
executed 3.6" APO.

<<Any marginal gain in brightness with the
additional 10mm aperture,>>
 
Um, I would hardly call it marginal. A 4" aperture has more than 25% more light
grasp than a 3.6". I notice a significant difference between the two (but, even
4" IMO is still in the "relatively puny" aperture range).

<< and any gain in contrast owing to an apo lens
design over a well figured mirror, quite possibly will not justify the cost >>

As far as "justifying the cost" goes, that is a very subjective variable to
calculate, and entirely up to the individual making the purchase.

rat
~( );>

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