From: Guy Brandenburg 
To: William Mc Hale 
CC:  atm{at}shore.net
Reply-To: Guy Brandenburg 


It was an 8" belonging to Marty at Company 7 that I looked through.
The price on them has increased from about $13k to about $65,000 in the
past 12 years or so, according to Company 7. You are right about the
current price for 6" astrophysics apochromats.

I (or we at the NCA/CCCC TMW) have a fair amount of crowns and flints in
the 4" to 8" range, but I don't see the point in making an
achromatic doublet, given the amount of extremely difficult figuring that
would be required of **4** surfaces, of which **3** would be convex.

Guy

William Mc Hale wrote:
> On Mon, 16 Jun 2003, Guy Brandenburg wrote:
>
>
>>I always get a kick out of looking through really expensive SCT's and
>>then going back and looking through my home-made Newtonian. Guess which
>>one is brighter and clearer for a given aperture? And I've looked
>>through one of Roland Christen's 6" (or was it 8"?)
apochromats. It was
>>better than my home-made newt, to be sure, but was it $20,000 better? I
>>don't think so. (Heck, that's more than I just paid for a new car!)
>>
>
>
> Well Roland hasn't made an 8" for quite some time, but the
6" are a bit
> more affordable than $20K.  I think the current price is about $7K.  Still
> alot, more than enough to get a very big Dob with the best possible
> optics.
>
> Bill
>
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