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Mike E.
Carpal Tunnel


Reged: 01/26/10

Loc: Moonstone Observatory
Re: Appreciating the Questar new [Re: Erik Bakker]
      #5852180 - 05/10/13 02:54 PM

Quote:

Bob,

Here is what my Q7 looked like on my picknicktable




Nothing compares to that Mystic Purple color scheme.


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bobhen
professor emeritus


Reged: 06/25/05

Re: Appreciating the Questar new [Re: Bill Boublitz]
      #5852231 - 05/10/13 03:41 PM

Quote:

Hi Bob!

Great question. It's never really been a problem. During winter months when ambient temperature is well below "out of the case" scope temperature, I typically get the scope out there by twilight and let it cool down with the rest of the air. When I polar align or start observing after dinner, it's ready. Usually stabilizes within a hour, two at most - no more.

The most shifting comes in Fall and Spring, when differences between air and ground temperature are greater. On these nights, I experience the mirror phasing slightly out of curve as it attempts to equalize to ambient temperature. Any 6" APO will be less affected in such an environment.

Questar puts a lot into their mirrors to counter these effects, namely using "Zerodur" instead of Pirex as a base. It's an option when you order. I highly recommend the Zerodur. The instrument is so well made and so well designed; if the night is bad enough to make the Q7's stability an issue, I probably wouldn't want to be out observing in the first place.

I tend to go for my 4" refractor when I know my time is limited, preferring the Q7 for longer sessions. Let me know what you decide. Good wishes ~ Bill





Thanks Bill.

Good to know.

I really love my AP 155 BUT I fear that someday a more compact scope might be in the cards Ė especially for Lunar/Planetary.

And even though the AP155 will cool faster, I donít set it up unless there is more than a reasonable chance of good sky conditions for at least 3-4 hours anyway.

I use my Tak 120 for the nights that are iffy.

I guess my back will tell me when itís time.

Bob


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greedyshark
professor emeritus
*****

Reged: 10/31/05

Loc: 3rd Rock
Re: Appreciating the Questar new [Re: Mike E.]
      #5854074 - 05/11/13 04:19 PM

Quote:


Nothing compares to that Mystic Purple color scheme.






Charles


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Bill Boublitz
super member


Reged: 05/04/13

Re: Appreciating the Questar new [Re: Erik Bakker]
      #5855026 - 05/12/13 08:51 AM

Sweet.

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mvw
super member


Reged: 03/07/13

Loc: Somewhere in the universe
Re: Appreciating the Questar [Re: John Zimmerman]
      #5855104 - 05/12/13 09:38 AM Attachment (21 downloads)

Just love my Questar too. The design, craftsmanship, optical quality....

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