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Brian L
super member
Reged: 11/17/08
Posts: 116
Loc: The garden paradise of Pittsbu...
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Does anybody know whether the eyepiece adapter that Televue sells for the Questar is compatible with older Questars- specifically those from the 1960's that were sold with the Erfle oculars instead of Brandons? I'm a Questar newbie...
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WO FLT-110 f/6.5, TEC optics
Losmandy G-11 Gemini
Meade 10" LX200 GPS/UHTC
Questar 3.5" Standard
Vixen VMC-110L
Canon 450D, unmodified
Assortment of TV Panoptic, TV Radian, Vixen LVW, and WO eyepieces
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Erik Bakker
professor emeritus
Reged: 08/10/06
Posts: 530
Loc: Haren, The Netherlands, Europe
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Hi Brian,
If you use the QUESTAR on it's forkmount, you can normally insert any 1 1/4" eyepiece. My experience is that they will stay put, so I never bother screwing in an adapter with a setscrew.
Clear skies,
Erik
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Visual astronomer, main instruments:
Fully mounted Questar 7 P-BB
Celestron C 102F f/8.8 fluorite
Vixen FL 70S f/8 fluorite
Celestron C 55F f/8 fluorite
Sets of Zeiss, TeleVue and Brandon eyepieces
Zeiss 7x50 Marine B/GA
Zeiss TM german equatorial
Gitzo 224 with Manfrotto 501 fluid head
Unitron alt-az mount
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Brian L
super member
Reged: 11/17/08
Posts: 116
Loc: The garden paradise of Pittsbu...
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Hard to see how the ocular would fall out even if you had the scope pointed at the zenith. I know you can do this with a Questar, but it isn't a particularly comfortable viewing position. I think the Erfles have 1-3/16 x 32 threads rather than the 1.26" threads that the Brandons have. So, the eyepiece adapter tube on these older models is a little narrower. I think that both the earlier and later eyepiece adapter tubes have .925" threads on the side of the control box. Just wondering if any Questar users out there know this for a fact.
--------------------
WO FLT-110 f/6.5, TEC optics
Losmandy G-11 Gemini
Meade 10" LX200 GPS/UHTC
Questar 3.5" Standard
Vixen VMC-110L
Canon 450D, unmodified
Assortment of TV Panoptic, TV Radian, Vixen LVW, and WO eyepieces
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Eric P
sage
Reged: 04/04/05
Posts: 390
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Yes, the Televue adapter works on my '68 for both the top eyepiece and rear axial ports. You just have to unscrew and remove the eyepiece barrel in order to use the Televue adapter.
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Brian L
super member
Reged: 11/17/08
Posts: 116
Loc: The garden paradise of Pittsbu...
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Thanks, Eric!
--------------------
WO FLT-110 f/6.5, TEC optics
Losmandy G-11 Gemini
Meade 10" LX200 GPS/UHTC
Questar 3.5" Standard
Vixen VMC-110L
Canon 450D, unmodified
Assortment of TV Panoptic, TV Radian, Vixen LVW, and WO eyepieces
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AV in CMH
sage
Reged: 11/07/05
Posts: 461
Loc: Columbus Ohio
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Brian,
I have a 1958 model and TV 1.25" adapter works great.
Anthony
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Billydee
super member
Reged: 01/23/08
Posts: 183
Loc: Winter Haven, FL
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Brian,
Why don't you get the adapter that Questar will sell you. It is a little better quality and it only costs $82. It is really the part that Q started installing in all Qs in 1995. It accepts all Brandons and normal 1.25" EPs. You can replace it yourself by just unscrewing the old one and screwing in the new one.
Luck, Bill
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