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Suggestions to mount a 4.5'' F8 reflector.

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#1 ngc 9999

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Posted 25 July 2013 - 07:35 PM

Hello,

I want to know what kind of mount I could get for my long 4.5'' reflector. Is it posible to use a alt-azimutal mount. I tried to modify the equatorial mount in which the telescope came, and modified to azimutal, but there is some play in the R.A axis.

#2 ngc 9999

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Posted 25 July 2013 - 07:36 PM

I also wonder if my Orion Paragon H2 tripod could support the weight of the telescope.

#3 hottr6

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Posted 26 July 2013 - 09:20 AM

4.5" Newts are quite lightweight, and there are many options.
Here are the Vixen Polaris and Tasco GEMs, both available on the used market.
Posted Image
Note that these GEMs can also be used in alt-az mode, and many people buy them for that exact reason.

I need slo-mo controls, and the Vixen Portamount II and ES Twilight alt-az are available new, though I have not tried them. I have used my 4.5" Newt on a AstroTech Voyager (NLA) and this mount is now being sold as the GSO Skyview alt-az.

The Vixen and Tasco GEMs and AT Voyager alt-az carry my 4.5" Newts extremely well, and are light enough to be considered a grab-and-go. Highly recommended.

#4 ngc 9999

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Posted 21 August 2013 - 05:00 PM

I have seen those mounts (Portamount II and AstroTech Voyager), but I'm not sure about the vibrations at high power and whether the telescope tube hits the tripod legs. Another solution might be getting somewhere a custom dobsonian mount, I don't have the patience to build one.

#5 obin robinson

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Posted 21 August 2013 - 05:56 PM

I have my 4.5" f7/9 on my skyview pro. It works great!

obin :jump:

#6 Jon Isaacs

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Posted 21 August 2013 - 07:41 PM

Hello,

I want to know what kind of mount I could get for my long 4.5'' reflector. Is it posible to use a alt-azimutal mount. I tried to modify the equatorial mount in which the telescope came, and modified to azimutal, but there is some play in the R.A axis.


My first thought would be to make the current mount work. With proper balancing, a little play in the RA axis shouldn't be a problem.

What mount are you using? Do you have a photo of how it is setup?

Jon

#7 ngc 9999

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Posted 22 August 2013 - 06:34 PM

I am using the cheap EQ mount in which the telescope came. It is in Alt-Az mode, but it vibrates while focusing at high power (150x). When pointed at zenith, it hit the legs in some directions.

#8 johnthomas

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Posted 25 August 2013 - 10:12 AM

Here's what I did for my 4.5 newt. I really like it. Although not shown in the photos, I also use a small digital level on the main OTA tube to give me full "push-to" capabilities.

Attached Files



#9 johnthomas

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Posted 25 August 2013 - 10:14 AM

Another view:

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#10 johnthomas

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Posted 25 August 2013 - 10:14 AM

Detail of the azimuth circle & "high-tech" pointer.

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#11 johnthomas

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Posted 25 August 2013 - 10:16 AM

Eypiece tray & carrying handle. The nylon case is for eyepiece caps &/or cellphone. Note the hand-weight/barbell on the bottom for stability.

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#12 johnthomas

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Posted 25 August 2013 - 10:19 AM

Detail of adjustable feet.

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#13 ngc 9999

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Posted 25 August 2013 - 01:31 PM

What about getting the Orion Versago II mount, it will be steady enough for focusing at high magnifications?

#14 tnakazon

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Posted 29 September 2013 - 08:26 PM

What about getting the Orion Versago II mount, it will be steady enough for focusing at high magnifications?

Yes, that mount will be very steady on a 114/900mm Newtonian (4.5" F/8 reflector). I use it on mine.

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