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Orion ST80 is back

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#126 LDW47

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Posted 04 December 2020 - 08:01 PM

A finder for what?

I thought you mentioned you use the 80ST’s as finder scopes not stand alone viewing ? Maybe I misread, misinterpreted ? Sorry if I misread your posts 12, 49, 51, 106 and your slight critic in post 115, it surely was my error ! Clear wide field skize !


Edited by LDW47, 04 December 2020 - 08:11 PM.


#127 Cali

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Posted 04 December 2020 - 08:11 PM

Finish the joke for * sakes, don’t leave us all in suspense !   LOL !

The bartender looks over the bar at the horse and says, "Why such a long face."


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#128 LDW47

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Posted 04 December 2020 - 08:14 PM

The bartender looks over the bar at the horse and says, "Why such a long face."

I thought it was an astronomy joke !  LOL !


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#129 Jaimo!

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Posted 04 December 2020 - 08:52 PM

I thought you mentioned you use the 80ST’s as finder scopes not stand alone viewing ? Maybe I misread, misinterpreted ? Sorry if I misread your posts 12, 49, 51, 106 and your slight critic in post 115, it surely was my error ! Clear wide field skize !

Chas has had more scopes than most of us...  combined.  smile.gif



#130 LDW47

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Posted 04 December 2020 - 09:27 PM

Chas has had more scopes than most of us...  combined.  smile.gif

So what are you saying ? What do mean ?



#131 BlueTrane2028

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Posted 05 December 2020 - 01:34 AM

I'd have to actually gather them together and count.

As for my own personal feelings with the ST80, It's about a 50/50 chance it ends up rehomed to an alt-az mount and pressed into service for terrestrial spotting.  Not enough aperture to tickle my fancy.  Would be a fantastic finder on a truly large telescope.  I do want to get such a thing at some point, so it will stay in my possession.

Mine was $45.  Had fungus on the objective but it cleaned up nicely.  I just pulled apart the included EQ1 mount, going to clean it and grease tomorrow. Today? it is 1:35am...



#132 CHASLX200

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Posted 05 December 2020 - 07:20 AM

I thought you mentioned you use the 80ST’s as finder scopes not stand alone viewing ? Maybe I misread, misinterpreted ? Sorry if I misread your posts 12, 49, 51, 106 and your slight critic in post 115, it surely was my error ! Clear wide field skize !

I used the ST as stand alone and then it was used a finder for back weight for a top heavy 6"ED.



#133 Ihtegla Sar

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Posted 05 December 2020 - 09:29 AM

Collimated ? What do you mean collimated, an ST 80 of any brand ?


I mean lining the focuser up with the lens cell so your out of focus star images produce concentric circles instead of comets. Yes. Any brand of ST-80.

At 16:00 of this video the technique for collimating an ST-80 is explained. https://m.youtube.co...e&v=Ylb7xnc_03U

#134 tony_spina

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Posted 05 December 2020 - 09:34 AM

A Porta II will be even better !

A Vixen Porta II  is $120 more than a VersaGo II. Not necessarily to spend that much for a mount for the ST80 

 

If money is not an issue then spend more and get a StellerVue M2C that is better than both the other mounts 



#135 LDW47

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Posted 05 December 2020 - 09:49 AM

I mean lining the focuser up with the lens cell so your out of focus star images produce concentric circles instead of comets. Yes. Any brand of ST-80.

At 16:00 of this video the technique for collimating an ST-80 is explained. https://m.youtube.co...e&v=Ylb7xnc_03U

I’ve owned several, never had an issue with collimation, great views ! Boy I am a lucky astronomer, never had a problem with it in any of my scopes !



#136 LDW47

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Posted 05 December 2020 - 09:53 AM

A Vixen Porta II  is $120 more than a VersaGo II. Not necessarily to spend that much for a mount for the ST80 

 

If money is not an issue then spend more and get a StellerVue M2C that is better than both the other mounts 

I agree but the Porta II is so much more smoother than the VersaGo or AZ4 that I sold my 3 and bought 3 Porta II’s ! The tension system of the Versa’s, the non stop sticking no matter the attempted adjustments is atrocious but if one wants to put up with that its great, its a great $ saving !



#137 tony_spina

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Posted 05 December 2020 - 10:12 AM

I agree but the Porta II is so much more smoother than the VersaGo or AZ4 that I sold my 3 and bought 3 Porta II’s ! The tension system of the Versa’s, the non stop sticking no matter the attempted adjustments is atrocious but if one wants to put up with that its great, its a great $ saving !

I disagree. Just because you had issues with the VersaGo doesn't mean everyone has. Lots of folks including me use the VersaGo with no issues at all.

 

You have a right to your opinion,  but don't bash other choices 



#138 CHASLX200

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Posted 05 December 2020 - 10:12 AM

I don't even have a mount for ST80.  Maybe i can make it work with the 90mm Orion ALT- AZ mount or maybe the rings will fit the ST80. I had no plans to start buying stuff again as i can't control myself and go off the deep end but i need a old SP mount or something close.


Edited by CHASLX200, 05 December 2020 - 10:13 AM.


#139 LDW47

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Posted 05 December 2020 - 10:19 AM

I disagree. Just because you had issues with the VersaGo doesn't mean everyone has. Lots of folks including me use the VersaGo with no issues at all.

 

You have a right to your opinion,  but don't bash other choices 

I had 3 of them, all the same ! And with those tension pads, when you let the mount sit for a few days they seize up so that when you go to use it they have to be broke loose. From my experience I will bash them every time, its more than just my opinion ! As to choices my fellow astronomers are free to use whatever they want, as always ! Right my fellow astronomer ?


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#140 tony_spina

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Posted 05 December 2020 - 10:23 AM

I don't even have a mount for ST80.  Maybe i can make it work with the 90mm Orion ALT- AZ mount or maybe the rings will fit the ST80. I had no plans to start buying stuff again as i can't control myself and go off the deep end but i need a old SP mount or something close.

I'm sure you are going to love the ST80 sample you got from Rolo.  He stated in the Ad that it has great optics.  A while back I got an old Celestron/Vixen 80mm f5 from Rolo in excellent condition that also has great optics 

 

The ST80 doesn't require much for a mount since it is so light weight and compact.

If you want to go the ultra portable compact route a Stellarvue M1 head on a photo tripod works great 



#141 tony_spina

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Posted 05 December 2020 - 10:25 AM

I had 3 of them, all the same ! And with those tension pads, when you let the mount sit for a few days they seize up so that when you go to use it they have to be broke loose. From my experience I will bash them every time, its more than just my opinion ! As to choices my fellow astronomers are free to use whatever they want, as always ! Right my fellow astronomer ?

You made my point.



#142 LDW47

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Posted 05 December 2020 - 10:27 AM

You made my point.

And I didn’t even know it !



#143 Cajunchuck

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Posted 05 December 2020 - 10:34 AM

I am so close to pulling the trigger on one of these.  It would be a great complement to my 8' SCT on the secondary saddle of my AZ mount.  I see the ST80-T (terrestrial) version is in stock.  Very tempting indeed...



#144 LDW47

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Posted 05 December 2020 - 10:53 AM

I am so close to pulling the trigger on one of these.  It would be a great complement to my 8' SCT on the secondary saddle of my AZ mount.  I see the ST80-T (terrestrial) version is in stock.  Very tempting indeed...

I understand the only difference is a 90° diagonal with the A and a 45° with the T model. If you convert to a 2” focuser it won’t matter.



#145 Cajunchuck

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Posted 05 December 2020 - 11:16 AM

I understand the only difference is a 90° diagonal with the A and a 45° with the T model. If you convert to a 2” focuser it won’t matter.

Yes same scope but the A version also comes mounted in a ring versus the dovetail/tripod mount.  I can always rotate the focuser if needed for side-mounting.  I'm buying this little guy.  Too good of a deal to pass up.  I even have a spare 90 degree diagonal already.



#146 LDW47

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Posted 05 December 2020 - 11:54 AM

Yes same scope but the A version also comes mounted in a ring versus the dovetail/tripod mount.  I can always rotate the focuser if needed for side-mounting.  I'm buying this little guy.  Too good of a deal to pass up.  I even have a spare 90 degree diagonal already.

Sounds great !



#147 Jon Isaacs

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Posted 05 December 2020 - 12:04 PM

I'd have to actually gather them together and count.

As for my own personal feelings with the ST80, It's about a 50/50 chance it ends up rehomed to an alt-az mount and pressed into service for terrestrial spotting.  Not enough aperture to tickle my fancy.  Would be a fantastic finder on a truly large telescope.  I do want to get such a thing at some point, so it will stay in my possession.

Mine was $45.  Had fungus on the objective but it cleaned up nicely.  I just pulled apart the included EQ1 mount, going to clean it and grease tomorrow. Today? it is 1:35am...

 

It's F/5.  ST-80's are not about aperture, they're about field of view and exit pupil.

 

Add a 2 inch focuser:

 

31 mm 82 degree = 6.0 degree at 6.2 mm at 12.9x

35 mm 68 degree = 5.5 degree at 7.0 mm at 11.4x

41 mm 68 degree = 6.6 degree at 8.2mm at 9.8x

 

These are very special views, a larger scope can't go those places.

 

With the stock 1.25 inch focuser, it'll do nearly 4 degrees with a 24mm SWA or a 32mm Plossl..

 

Is your objective cell metal or plastic?

 

Jon


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#148 tloebl

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Posted 05 December 2020 - 04:28 PM

Has anyone tried the ST80 as a guide scope?



#149 CHASLX200

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Posted 05 December 2020 - 05:34 PM

It's F/5.  ST-80's are not about aperture, they're about field of view and exit pupil.

 

Add a 2 inch focuser:

 

31 mm 82 degree = 6.0 degree at 6.2 mm at 12.9x

35 mm 68 degree = 5.5 degree at 7.0 mm at 11.4x

41 mm 68 degree = 6.6 degree at 8.2mm at 9.8x

 

These are very special views, a larger scope can't go those places.

 

With the stock 1.25 inch focuser, it'll do nearly 4 degrees with a 24mm SWA or a 32mm Plossl..

 

Is your objective cell metal or plastic?

 

Jon

What would be the best choice for a 2" focuser?



#150 Ihtegla Sar

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Posted 05 December 2020 - 06:43 PM

I’ve owned several, never had an issue with collimation, great views ! Boy I am a lucky astronomer, never had a problem with it in any of my scopes !


Maybe I'm unlucky? I've had two Meade ST-80 clones (one Infinity amd one Adventure Scope) and one Celestron that was basically the same scope in a 102mm size all purchased new and all three were noticeably out of collimation under an out of focus star test.

Edited by Ihtegla Sar, 05 December 2020 - 06:44 PM.

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