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TPO 152mm f/6 newtonian ota

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#1 dmgriff

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Posted 17 November 2019 - 05:34 PM

TPO or Third Planet Optics (OPT house brand) D=152mm F=916mm f/6 newtonian ota, rings/dovetail, 199usd shipped.
 
 
Included are ota, 6x30 straight thru finder, 2in single speed Crayford, rings/dovetail. Steel tube weight = ~14 lbs, tube length = ~34in. Marketed as visual/photography.
 
Nice affordable newtonian ota. The single speed Crayford is hefty and functional. Needs a 2in/2in extension tube for visual focus in my use, one of my Borg 1.25in helical/insert should work for fine focus adjustment, instead of the extension.. Tube weights as much as my OOUK aluminum f/8 ota. Might be sturdy enough for some AP.
 
Add at least a EQ3 or appropriate alt/az (~300usd), and for a total of about 500usd you have a nice entry level visual set up. If you have a 900-1200mm fl, you already have a set of eps.
 
A couple of images....
 
On a Vixen Porta II
DSC00162

Some jitters,  usable with the slomos.

 

On a Astrozap GEM (manual lxd75)

DSC00165

Nice and sturdy.

 

The best 4.5in f/8 is a 6in f/6.....

 

Have not had a chance for astro viewing, of course....

 

Good viewing,

 

Dave


Edited by dmgriff, 17 November 2019 - 05:37 PM.

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#2 james7ca

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Posted 17 November 2019 - 06:10 PM

Here is a link (on CN) to a first light report that I did in April 2016 on this same scope (TPO 6" f/6):

 

  https://www.cloudyni...n/#entry7166212


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#3 dmgriff

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Posted 18 November 2019 - 07:19 AM

Image with Borg #7315/7316 1.25in helical focuser with 1.25in insert adapter for fine focus, substituted for 2in extension tube.
 
DSC00170

 

 

2in/2in extension tube and helical add about the same amount of travel...

DSC00169

 

 

Borg #4317 &  7315 1.25in helicals and #7316 insert adapter:

https://www.sciencec...s/html/7315.htm
https://www.sciencec...s/html/4317.htm
https://www.sciencec...s/html/7316.htm

 

There are also many similar helicals on the net...

 

Good viewing,

 

Dave


Edited by dmgriff, 18 November 2019 - 07:53 AM.


#4 Jon Isaacs

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Posted 18 November 2019 - 08:37 AM

If you want to upgrade the focuser to a two speed, Agena Astro sells a kit for the GSO focusers:

 

https://agenaastro.c...pgrade-kit.html

 

They're $60. 

 

Jon


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#5 howardcano

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Posted 18 November 2019 - 12:00 PM

I bought my TPO 6" f/6 Newtonian mostly for low magnifications, but I have been pleasantly surprised by its planetary performance, even with the relatively large central obstruction.

 

It works nicely on a dual-drive Skyview Pro GEM.


Edited by howardcano, 18 November 2019 - 12:02 PM.

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#6 belgrade

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Posted 18 November 2019 - 01:16 PM

Nice... I like it. I have a Celestron Omni XLT 150 and I love it. I’m amazed how much one can see with these on a sturdy mount!
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#7 dmgriff

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Posted 20 November 2019 - 08:25 AM

The TPO f/6 will replace my 6in f/8 dobsonian (Hardin DSH6), as it is too heavy for me to carry around anymore.
 
The TPO 6in f/6 on the Porta II is lighter than the dob, light enough for me to move around. Also, the whole setup transports well in my Dodge Caravan. Everything basically lays down flat in the van, a lower profile than a dob. Also, more aperture than my refractors on the Porta II.
 
I can use the f/6 ota on a manual eq5 I have in the back yard, or on the Porta II as a g&g/travel scope.
 
I believe I will be satisfied with the f/6 newtonian (assists my OOUK 6in f/8 ota).
 
DSC00174 (2)
I adjusted the slomo controls on the Porta II for my use with the reflector, added a 9x50 raci,  a inclinometer (use as desired), and a chair.

 

 

Good viewing,

 

Dave


Edited by dmgriff, 20 November 2019 - 08:42 AM.

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#8 james7ca

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Posted 20 November 2019 - 05:00 PM

If you want to upgrade the focuser to a two speed, Agena Astro sells a kit for the GSO focusers:

 

https://agenaastro.c...pgrade-kit.html

 

They're $60. 

 

Jon

That looks like a pretty good upgrade, but it will NOT fit my TPO 6" that I purchased in 2016 since my focuser doesn't match the product description (requirements). I don't know about the OP's focuser, but based upon the earlier pictures it looks to be the same.

 

That said, it appears that at least one of the customer comments on the Agena website says that the upgrade can be "made to work" on some focusers that don't conform to the product requirements.


Edited by james7ca, 20 November 2019 - 05:05 PM.


#9 dmgriff

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Posted 20 November 2019 - 05:43 PM

One of the low cost asian helicals with appropriate adapter from the net would be about 60usd, I believe.

 

Just need to know the correct thread and size of the male/female adapter(s).

 

Good viewing,

 

Dave

 

 

 



#10 dmgriff

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Posted 06 December 2019 - 09:14 PM

I took the TPO/Porta out early tonight for a little lunar viewing.

 

Eyepieces were 26mm Meade LP SuperPlossl, 15mm TV plossl, 12mm UO ortho, 9mm AstroHutech ortho, Antares (Japan) 2x 3-element, 3x barlows. All very sharp in native FL. The 15mm and 12mm barlowed nicely at 7.5mm, 6mm (1mm exit pupil) and 5mm. Very sharp and contrasty along the terminator. 

 

Like stated previously some jitters, and it is usable with the slomos for me.  About 2 seconds dampening time. I think about 180x with the 5mm equivalent is the highest magnification for me with the  g&g TPO/Porta setup due to the jitters. I think that is sufficient for g&g. Should handle much more magnification on the AstroZap GEM.

 

This is a great visual scope in my brief use. Do not think it would disappoint anyone.

 

Good viewing,

 

Dave

 

 

 


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#11 dmgriff

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Posted 12 December 2019 - 04:59 PM

Since my Borg #7315 helical and adapter are 1.25in, and I normally have it on my Vixen A81M refractor with a 1.25in diagonal, I purchased this Svbony 1.25in helical with 2in insert adapter for ~40usd for the 6in f/6 newtonian as a fine focus.

 

https://www.amazon.c...SSYY82QWFFZY2JY

 

The Svbony has tighter/stiffer movement than the Borg #7315, but it is about 1/3 the price of the Borg and adapter.

 

Svbony also sells the 1.25in helical only for ~30usd. If you want a 1.25in adapter insert, you will need a 1.25in T thread insert adapter, maybe a gender bender adapter to fit (on Ali express I believe). Total will be similar to the above.

 

The same 1.25in_helical/2in_adapter is mentioned in this CN thread:

 

https://www.cloudyni...er/?hl= helical

 

Additionally, I took the Borg #4317 (rotating helical) and 1.25in adapter off  another scope and it is much more smooth/sensitive to the touch than the non-rotating Svbony. The Borg #4317 and adapter is about twice the cost of the Svbony. The Borg will probably wind up on the TPO, but, I'll give the Svbony a try on the f/6 newt. Maybe, I can use the Svbony with some of my refractors for straight thru somehow?

 

Good viewing,

 

Dave


Edited by dmgriff, 13 December 2019 - 07:26 AM.


#12 dmgriff

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Posted 14 December 2019 - 05:03 PM

Just a FYI, FWIW, on the Svbony 1.25in helical with 2in adapter with my TPO/GSO 152mm f/6 newtonian as fine focus on a Vixen Porta II:

 

Just playing with the setup, the Svbony is really stiff to me in the general movement of the non-rotating focuser. My setup with the Porta II is subject to some jitters as is. The stiffness of the overall general movement of the Svbony makes it unusable on this particular setup for my use.

 

I have moved the Svbony to my C80ED kit.

 

 

Therefore, the Borg #4317 rotating helical and #7316 adapter are going on the 6in f/6 scope for fine focus.

.

 

Good viewing,

 

Dave


Edited by dmgriff, 14 December 2019 - 05:05 PM.



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