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Fs 102 for a TSA-120

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#1 paul

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Posted 23 July 2019 - 03:09 AM

Hello,

I have a chance to get a TSA 120 but in order to do it I will have to sell my awesome FS 102

The 102 is a beautiful scope with perfect views.

Is it worth it???? Is a TSA 120 that much better??

Help!!

Thanks

Paul

 



#2 agmoonsolns

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Posted 23 July 2019 - 03:20 AM

For me, absolutely yes!


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#3 Marcus Roman

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Posted 23 July 2019 - 03:33 AM

Hello,

I have a chance to get a TSA 120 but in order to do it I will have to sell my awesome FS 102

The 102 is a beautiful scope with perfect views.

Is it worth it???? Is a TSA 120 that much better??

Help!!

Thanks

Paul

The FS102 is a Fluorite (Ca2F) doublet, Fraunhofer design: be very cautious, its visual performance is to my eyes on pair with my ultra premium Pentax 105SD. Try to watch in a TSA 120 before to sell your FS102...My humble opinion...



#4 StarDust1

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Posted 23 July 2019 - 04:18 AM

The TSA that I had, the Optics was perfect to my eyes. So, does the optics of the FS102 that I have.

Choosing between these two I would more worry about portability and cooldown. The TSA is heavier then the FS102, if you don’t mind the longer cooldown and weight of the TSA, then yes, I would go for the TSA120.
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#5 junomike

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Posted 23 July 2019 - 06:19 AM

I see you also have the  FC100 in you Signature so the TSA makes perfect sense IMO.


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#6 bobhen

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Posted 23 July 2019 - 07:08 AM

I had a superb 105mm F6.25 triplet apo with killer LZOS Russian optics. I was hesitant to sell it but I wanted a little more aperture. The aperture boost to 120mm was not earth-shaking but it was noticeable and worthwhile. 

 

I purchased my Tak TSA 120 10-years ago. I still have the TSA 120 and would make the same trade today.

 

The TSA 120 cools reasonable quickly for a triplet and just about any mount that will hold a FS 102 will hold the TSA 120 so you really don’t lose much if anything in portability.

 

The TSA 120’s optics are fantastic with zero color, even in the star test.

 

Do it. You will not regret it. They only thing I wish Tak would do is make a TSA 90mm.

 

I can’t recommend a TSA 120 enough.

 

Bob

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#7 RAKing

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Posted 23 July 2019 - 08:44 AM

My TSA-120 was a wonderful scope and as long as you can hang onto your FC-100, then I would go for the deal.

 

Best of luck,

 

Ron


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#8 CounterWeight

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Posted 23 July 2019 - 10:09 AM

I thought the TSA-120 a great optic, though in my case I was comparing to the FS-128, and it compared very well.  A bit different presentation when it comes to color but there was not that I remember a time or object when one scope showed something the other did not show.  Advantage and ease of use go to the TSA-120 in the comparison I did.  I kept the FS-128 as it's my reference scope, and someday thought to make a BV pair, I have 2 FS-128's.

 

The one advantage I think you'll get is mainly from the aperture increase and the tradeoff when higher power viewing where you experience dimming and floaters from exit pupil.


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#9 Scott in NC

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Posted 23 July 2019 - 11:34 AM

Since you have both a FC100 and FS102, I think it's reasonable to sell one or the other to get a TSA120.  On another note, I've owned a FS102 for 5 years, and so far my opinion has been that I don't want to sell that particular scope for anything!  But then again, that's my only 4" apo.


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#10 CounterWeight

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Posted 23 July 2019 - 11:57 AM

From 2017, here is the TSA 120 on an Orion Skyview pro mount (with the mount extension), my preferred straight through planetary way to view.  I would never try this with my FS-128!

 

rdx 4 CN TSA120 Sirius mount 20170508_221538.jpg


Edited by CounterWeight, 23 July 2019 - 11:58 AM.

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#11 paul

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Posted 24 July 2019 - 12:01 AM

Hello, Thank you for the replies.. Actually I would have to sell them both to do this. Does that change anyone's mind.

I am honestly kind of stuck on this decision so all the opinions are very helpful

Thanks all

Paul



#12 Kunama

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Posted 24 July 2019 - 12:23 AM

Like trying to choose which is your favourite child....

 

 

If it is going to be your only refractor I would say yes, sell the two 4" ones and get the TSA120. 

As mentioned above, the TSA120 is no more difficult to mount than the FS102.  The advantage of the aperture is visible on all targets.

 

If you could manage with selling only one of the 4" I would sell the FC and keep the FS102 to pair with the TSA120.


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#13 agmoonsolns

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Posted 24 July 2019 - 01:10 AM

What about selling both so you can get the TSA-120 and then get a smaller used Takahashi, would that work? Then you would have one for hard core observing and another smaller, super portable one for grab-and-go observing when you don't have the time/energy to set up the larger scope.


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#14 peleuba

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Posted 24 July 2019 - 08:12 AM

What about selling both so you can get the TSA-120 and then get a smaller used Takahashi, would that work? 

 

Right - a Sky90 and a TSA120 would be a very good combination.  Even an AT92 and a TSA120 would be nice. 


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#15 25585

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Posted 24 July 2019 - 08:48 AM

I would keep the FC100. Its light enough for g&g, and gives wider field views.



#16 RAKing

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Posted 24 July 2019 - 09:08 AM

Hello, Thank you for the replies.. Actually I would have to sell them both to do this. Does that change anyone's mind.

I am honestly kind of stuck on this decision so all the opinions are very helpful

Ouch!  That is a bummer!  Being forced to let both of your beautiful 4-inch Taks go to get the TSA-120 would be difficult for me - and I have owned two TSA-120s in the past seven years.

 

But I guess the question then becomes, "What about all those Dobs in your signature?"  Are they your primary observing instruments?

 

If the 4-inch or 4.7-inch refractor is only a part-time - or grab and go - scope, then you might as well keep the little Taks.  We all like shiny new toys, and I am one of the worst offenders, but sometimes what you already have is still wonderful. flowerred.gif

 

Cheers,

 

Ron


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#17 areyoukiddingme

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Posted 24 July 2019 - 01:29 PM

Well, this is the refractor forum afterall . . . 

 

Instead of "get a Dob!" . . . how about "get rid of a Dob!"

 

Those dobs are very closely spaced in aperture, why not sell one of those, keep a 4" for grab and go, and get the 120 for a middle-weight/easy to use scope?


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#18 Scott in NC

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Posted 25 July 2019 - 02:11 AM

Well, this is the refractor forum afterall . . . 

 

Instead of "get a Dob!" . . . how about "get rid of a Dob!"

 

Those dobs are very closely spaced in aperture, why not sell one of those, keep a 4" for grab and go, and get the 120 for a middle-weight/easy to use scope?

That's what I'd do.  But then again, I'm a refractor fanatic. :grin:


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#19 bobhen

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Posted 25 July 2019 - 07:40 AM

Right - a Sky90 and a TSA120 would be a very good combination.  Even an AT92 and a TSA120 would be nice. 

Yeah, I keep hoping that Tak will offer a new 90mm doublet (or even a 90mm TSA triplet) with a longer FL than the Sky 90, maybe something like F 6.5. That scope wouldn’t have the alignment issues of a really fast doublet and would be lighter and more portable than the 100 series. A scope like that could also compete with the AP 92 and CFF 92mm triplets, which seem to be in demand.

 

It would also fit “really well” with my Tak TSA 120!

 

Bob


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#20 starman876

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Posted 25 July 2019 - 02:47 PM

I am turning my Fs102's into binos so the TSA 120 will stay until I get me first view through the bino scope.  Maybe then the TSA 120 will need to go.   I have heard only a few report about Taks being used as a binoscope.


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#21 25585

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Posted 26 July 2019 - 06:35 AM

https://astromart.co...inoscope-wmount

 

https://www.cloudyni...a120/?p=7288659


Edited by 25585, 26 July 2019 - 06:41 AM.


#22 CounterWeight

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Posted 26 July 2019 - 11:02 AM

I feel for you, the 'worth it' part of things impossible to be certain of without seeing for yourself. IMO no bad or wrong choice when it comes to Takahashi scopes. I know according to some folks prefer the TSA 120 and or the TOA 130 to the FS-128 but the FS is the one I've held on to after comparing.  I think often in these small refractors observing minutiae often get blown out of proportion on the web forums.  You have large aperture with your Dob's so you understand the TSA would be a very small incremental step in anything related to resolution.  I'd expect the main difference would be exit pupil dimming at higher magnification if you have the skies for it.

 

Part of the reason I've held onto my 128 is that after years I am very familiar with it or them, I call them my reference scope.  Maybe a more painless path would be to buy a used SW 120 and see if that aperture scratches the itch.  It's not exact spec equivalent but close enough and a lot less ca$h to approach.


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#23 bobhen

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Posted 26 July 2019 - 11:41 AM

The aperture difference is pretty insignificant between a TSA 120 and a FS 128. As a matter of fact, when it comes to planetary performance, Mr. Yoshida, the experienced Japanese planetary observer, rates the TSA 120 and the FS 128 exactly the same.

 

The reason to purchase a TSA 120 over a FS 128 is for the TSA’s better color correction, especially for imaging and for the TSA’s lighter more compact OTA that can ride on a slightly smaller mount.

 

If you are purely visual and already have a mount for an FS 128 that you can use easily, then there is no pressing need to make a change.

 

If you have neither and have an opportunity to purchase one or the other, the TSA 120 checks off a few more boxes.

 

Bob


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