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dweller25
sage
Reged: 08/30/07
Posts: 250
Loc: 53.6°N - UK
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I believe both scopes use FPL-53 glass so it would be very interesting to compare the doublet to the triplet.
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Be true to your teeth and they will never be false to you.
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BarrySimon615
Pooh-Bah
Reged: 03/01/04
Posts: 1279
Loc: New Orleans, LA
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I cannot speak about the comparison above, but.....
I had an Orion ED100 with FPL53 glass. The views were great and well corrected. The freedom from false color was about equivalent to my Tak FCT76 as well as the TV102.
So I bought a new TAK TSA102....why do that? Not sure why, but I wanted one. A comparison between the TSA 102 and the ED100 showed me quite clearly how much better the TSA was - tighter, smaller and brighter star images as well as a noticeable increase in faintest stars seen and clearly seen better color correction. I would imagine that the TSA120 vs. Skywatcher 120 ED would yield similar results.
At least the comparison validated my impulsive purchase.
Barry Simon
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LLEEGE
Running out of Oxygen
Reged: 03/03/05
Posts: 9056
Loc: Cloud-chester,NY
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Quote:
I would imagine that the TSA120 vs. Skywatcher 120 ED would yield similar results.
I agree.
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"Okay! You draw the straws. I'm-a taking the parachute."
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drago
member
Reged: 01/11/08
Posts: 95
Loc: Latvia
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xmm... compared mercedes with volkswagen? very, very interestingly 
imo mechanics and optics on this both is not comparable, as so, as they prices...
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Sky-Watcher 100ed refractor on old HEQ5
Sky-Watcher 15075 refractor on EQ5 with motors
Orion Optics Europe 200 F6 newton
wo 66sd on modified synta AZ3
npz 8x50 seeker
18x50 beer bottle telescope
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jrcrilly
Refractor wienie no more
Reged: 04/30/03
Posts: 25195
Loc: NE Ohio
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Quote:
imo mechanics and optics on this both is not comparable, as so, as they prices...
True enough. The number of elements is probably not the most significant difference between those two. To see the difference between a doublet and a triplet it would make more sense to compare the Chinese doublet to one of the many Chinese 115mm FPL-53 triplets available.
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John C
Urban Observatory
A&M/Astreya 76mm F/6 APO
TMB/LOMO 80mm F/7.5 APO
Tak FSQ-106N F/5 APO
Meade 178ED F/9 "APO"
Meade ETX-125AT
C14
Teeter 20" F/3.8 truss Newt w/ServoCat
CI-700, NJP, GPDX/SS2KPC, CG5-GT
ST-10XME, DSI Pro
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Clive Gibbons
Mostly Harmless
Reged: 05/26/05
Posts: 13431
Loc: Oort Cloud
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The Tak TSA-120 has just come out, so no user reports yet.
Certainly no analytical tests to compare.
The TSA-102 is better represented and more quantitative data is available.
Best examples of the 120ED doublet show it compares very favorably. High Strehl ratio and basically as "apo" at visual wavelengths.
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A few telescopes of dubious value.
Understanding wife, two curious cats and one sadly departed.
"Semper ubi sub ubi"
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