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Realistic refractors for an Az GTi mount?

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#1 25585

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Posted 01 August 2020 - 05:14 AM

What refractors have, do, or might you use with an Az GTi mount or the Star Discovery?

 

I have a TV Pronto & 85, 66 & 80 Equinox, plus a Vixen A80M in its weight capacity. However I use heavy optics, diagonals and eyepieces, plus the usual 8x50 finder & RDF.

 

Wanting to dip my toe into GOTO, to gain experience before deciding on a larger mount.   

 

 


Edited by 25585, 01 August 2020 - 05:39 AM.


#2 starryhtx

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Posted 01 August 2020 - 07:59 AM

60-80mm doublets, or even a 4" doublet, i wouldn't put a triplet on one of those. 


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#3 AaronF

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Posted 01 August 2020 - 10:14 AM

Hi!

I recently finished assembling a travel telescope kit with the AZ-GTi mount:

traveltelescopepacked

 

The telescope is the TS 80mm f/7 doublet with FPL-53 which weighs 3kg.

The mount handles it, but I wouldn't want to put anything heaver on it, as I feel it would start to struggle.

 

I usually use it with a Baader T2 flip mirror which is quite light, but have some balancing issues with some heavier eyepieces, so I tend to use my 17.5mm Morpheus as my main low power eyepiece.

 

(I haven't tried using my Maxvision 40mm with it, either - I think I'll de-cloak it first! :D )

 

I don't have many decent photos of it, only this one from a few weeks ago - hunting Comet Neowise without a diagonal:

traveltelescopecomet
 
Oh, and here's having found it :D
c/2020 f3 neowise median stacked stretched

 


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#4 J_D_Metzger

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Posted 01 August 2020 - 01:11 PM

I have a Sky-Watcher EvoStar 72 72mm APO on my AZ-GTi, and am very pleased with it.  The looks match the mount too.. smile.gif

 

Here's a pic I found on the web.  It looks just like my setup...

 

fileMZK3M88M.jpg


Edited by J_D_Metzger, 01 August 2020 - 01:19 PM.

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#5 25585

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Posted 01 August 2020 - 02:13 PM

Thank you for replies so far. My 66, 70 & 80, all being short tubed seem appropriate. Keeping to 1.25" eyepieces probably.



#6 Robhatherton

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Posted 01 August 2020 - 05:35 PM

I’m using an Altair Astro Ascent 102ed f7. It weighs about 4kg and I use a 9x50 finderscope and 2” diagonal. For visual the mount copes perfectly well as long as the scope is balanced front to rear. 


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#7 MJB

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Posted Yesterday, 12:51 AM

i'm using the AZ-GTi with a Tak FC-100DZ. I would't go much heavier than that, but it seems to cope with that load (plus binoviewer) without much problem. Anything over a slight breeze can get things moving. so next move for me is a tripod upgrade from stock. However, I'm really liking the grab and go nature of the setup. It should work fine with your OTAs, and for the price it's a lot of fun. 



#8 Robhatherton

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Posted Yesterday, 01:45 AM

Sorry forgot to mention, mine is mounted on a heavier tripod the one by Skywatcher similar to the eq5 just with a different bolt on top.



#9 sg6

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Posted Yesterday, 08:25 AM

I use a 72ED mainly as I have a 72ED.

Do not intend to try the 81 triplet and by weight the Megrez 90 should fit but it looks a bit more then I feel safe with - don't care about the mount, do care about the scope.

 

80mm doublets seem common, thinking the Skywatcher 80ED here.

 

People have tried 102's but I have a 102 and it looks way too much, even if it is less then the quoted 5Kg, just not a lot less.

 

So 80mm doublet of reasonable length for moments of inertia and the motors, seem to be the sensible.

However as I sit saying that - when has sensible ever really come in to things?


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#10 Bowlerhat

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Posted Yesterday, 09:15 AM

On the long thread there's a pic of converted AZ GTi with a wedge with astrophotography setup, quite amazing (davidpark's)

https://www.cloudyni...-for-eaa/page-3

gallery_277126_9320_17763.jpeg

The problem is not being able to use it in alt/az, but rather how much load you can put until the gear gave in. The quality control seems to be varied, some people having problem with the slouch, some people can use it accurately even for non guided AP. I have seen people opening it up to give modification to address it. However I'm not sure if they've rolled another update for it.

 

I also have seen people mounting SCTs, think 5/6"? You can also plug in a weight on side to balance it out. 

Use a long bolt (was it m12/16?) on side, put weight on it. I heard using suppression pads with added weights improves it's load.


Edited by Bowlerhat, Yesterday, 09:16 AM.

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#11 Droro

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Posted Yesterday, 01:46 PM

I use a es80ed, handles it easily on modified az3. Plus I replaced for the adm bracket.


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