Yep - the took this out a while ago and repaced it with a dob with
smaller diameter and better figure.
evan
David Staples wrote:
>There was a complete 40 inch at RFO at one time, I was able to observe with
>it twice. If I recall correctly it was about an f3.2 and had quite a
>problem with astigmatism. At one point they were trying to get an optician
>to make a correcting lens for it but I guess that fell through. I think
>they said that the rocker box and secondary cage were made with wood from an
>old chicken coop.
>
>Dave
>
>
>
>-----Original Message-----
>From: Evan Garber [mailto:evang@pacbell.net]
>Sent: Tuesday, August 31, 2004 10:50 AM
>To: The Astronomy Connection
>Subject: Re: [TAC] Robert Ferguson Observatory question....
>
>
>The secondary cage came from another potential Dob of similar dimensions
>that was not completed. - perhaps this is the one you are thinking of.
>
>The seeing is impaired by the proximity of the northern bay and by the
>fact that the wet evening air funnels up the valley of the moon- at
>least this is my theory. I never get the FWHM readings in MaximDl
>comparable to those at Lake Sonoma or Lassen.
>
>Best
>
>Evan
>
>Hope to see ou all at Calstar!
>
>
>Mark Wagner wrote:
>
>
>
>>At 8/30/2004, you wrote:
>>
>>
>>
>>> They were laying out a 40 inch dob that is in the process of being
>>>built ( just started the mirror - but have the secondary support
>>>completed.
>>>
>>>
>>Oh! I thought the 40 was operational some time ago. I wonder if it
>>is a rebuild.
>>
>>
>>
>>>The seeing up here is not very good - even up at 2000 feet - and the
>>>darkness does not match Lake Sonoma. To the south you get the light
>>>dome from Sonoma and to the north from Santa Rosa.
>>>
>>>
>>Is it usually poor seeing?
>>
>>Thanks for all the help...
>>
>>Mark
>>
>>
>>
>>
>>
>
>
>
Received on Tue Aug 31 11:11:28 2004