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The SV157 extension tube is commonly used with refractor telescopes and visual setups where additional back focus is needed
and professional-grade connection for demanding astrophotography setups
The SVBONY SV223 1
Attention: The SQA55 and all electronic focusers that appear in the illustrations are not included in this kit and are for display only
Askar FRA500 90mm f/5.6 Quintuplet Flat-Field APO Astrograph svbony sv535 The SV157 extension tube isAskar FRA500 f 5. 6 Quintuplet Astrograph APO Refractor Telescope The Askar FRA500 belongs to the renowned FRA (Flat field Refractive Astrograph) series. With a quintuplet, Petzval like design including two ED elements, it delivers a naturally flat field and excellent chromatic correction for full frame astrophotography and refined visual observing. Highlights 5 element Petzval style optical system (3+2) with two ED lenses for tight, colour pure stars
US$ 300.50
US$ 188.00
US$ 90.30
US$ 103.42
US$ 10595.00
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