Share 'A Direct Comparison Of 200mm f/4 and a 90mm f/7 Scopes'
I've had a few conversations recently about the difference between my Vixen R200SS and my Vixen ED103S.
Aperture: 200mm (8")
F Ratio: f/4
Aperture: 103mm (masked down to 90mm due to spacers in the light path causing unwanted diffraction spikes)
F Ratio: f/7.7 (but f/8.8 after the masking and f/7 after introducing the reducer)
Design: Apochromatic Refracto…
You can share this blog post in two ways…
Share this link:
Send it with your computer's email program: Email this