The Sightron SJH-75UF is a 75mm f/5 full-frame astrophotography refractor that claims diffraction-limited performance across a 44mm image circle. That sounds almost too good to be true, so I tested it with a ZWO ASI6200MM / Sony IMX455 and a 2x drizzle integration on M13 to see how sharp this telescope really is.

In this review, I look at the Sightron SJH-75UF as a real imaging telescope, not just a spec sheet. We go through the hardware, the focuser, the 6-element optical design, the full-frame image circle, the spot diagram, the Airy disk, Strehl ratio, sampling limits, and the real-world images I captured with it.

Sightron website (use in-browser translator): https://bit.ly/4gayGNo

Buy at Astro Hutech: https://bit.ly/sightronhutech

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#Astrophotography #Astronomy #Telescope

00:00 - Intro - Is This Telescope Possible?

01:56 - Sightron - The Company

02:47 - The Spec Sheet

06:51 - The Price Point

07:29 - Diffraction Limited Optics

10:34 - The Image Scale

11:24 - Resolution Test: M13

13:05 - Further Images

13:32 - The Sightron Experience

13:46 - Limitations

15:33 - Conclusion