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Originally Posted by ausastronomer
Geoff,
Your 100% correct here. A reasonable telescope it might be, a True APO it won't be.
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Originally Posted by janoskiss
Don't be so sure.  |
Of course your right, WTFWIK. I am still on "L" plates.
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Originally Posted by ausastronomer
Eliminating chromatic aberration in a 120mm refractor is significantly more difficult and will usually require the introduction of a flourite element or a 3rd lens element...
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Originally Posted by janoskiss
The page linked in Houghy's first post states that the ED120 does use a fluorite element.  |
So you think because Synta have stuck a flourite lens element in it, that now qualifies it as an APO ? My wifes Hyundai has Continental tyres on it just like the guy next doors Mercedes. That similarity alone doesn't make my wife's Hyundai a Mercedes. A bit more to making a 5" APO than sticking a flourite lens element in it.
The scope may well turn out to be superb, but I am a little sceptical. I am guessing its likely to be pretty good and a good level above the 5" achromats, but still a notch behind top grade 5" APO's like the Takahashi TOA 130 or the Televue NP 127, or even a good 5" Flourite doublet like the TAK FS-128. You don't get silk purses out of sows ears. I am just warning prospective buyers that producing a 5"/F7.5 APO is a LOT more difficult, and particularly when cost constrained, than it is to produce an 80mm/F7.5 APO. Hence buyers should approach it with an open mind as its performance "could" be a little down on what they may be expecting. The day will come when the Chinese produce a good 5" APO, I don't know that they are quite there yet.
Try before you buy if possible.
CS-John B