You shouldn't thing in terms of '35 mm equivalent'. It only describes the field of view equivalent, not the viewing angle per pixel.

Do the calculation: What is the angle per pixel?

But it still could be an interesting cheap guide cam. Just need a old Thorlabs 160 mm 2" doublet for example. 3D print the housing and off you go.

I have designed a 50 mm guide scope with a Thorlabs 200 mm doublet using my 3D printer, some lathe-work and a piece of carbon fiber from e-bay. It works superb!
Super light weight at only 200 grams -including the Touptek IMX290 camera-, yet is as good as a-thermal and can be well focused.

Cheers! Bart

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