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Showing results for tags 'doublet'.
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I kinda "force" my Astrotrac with my 102ED on top so I'm out shopping for something more appropriate... an 80 mm FPL53 is a must for both doublet and triplet. It will be used for astrophoto and visual g'n'g. After tons of reviews and articles I came with a very shortlist. And here comes my indecision, since the tubes are more or less "identical" but labeled by different companies. -triplet represented by Orion ED80T CF Astro-Professional APO 80 Carbon TS 80mm f/6 (not Carbon) Tecnosky Triplet FPL-53 APO 80/480 -doublet (more or less alike) made by TS 80/500mm Altair Lightwave 80mm F6.25 The budget is 1000$ (~800e) not a cent extra Altair Lightwave doublet and AstroProfessional triplet are my favorites, but can't decide which. thank you