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Tak fluorite doublets have a question mark over them for astrophotography. I note the latest model says 50% less blue halation around stars. You really want no halation not just reduced. False colour is the enemy of astroimaging and refractors.
I used to have an FS102 and an FS152. The 152 showed blue rings around bright stars and was really only a visual scope (where it excelled).
The TSA102 is a triplet and excellent correction and would be far and away the safe choice for imaging.
You usually pay a lot extra for that last 20-40% of performance.
$4400 for a William Optics GT102 sounds like a lot. I am sure it performs fairly well as do most of these FPL53 triplets. But is it in Tak triplet territory?? I doubt it.
Greg.
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