| v1 · 0.7× | v2 · 0.8× | |
|---|---|---|
| prescription | WienRC1524 8852 Reducer 0.7x V0.txt | WienRC1524 Reducer 0.8x freie Höhen V00.txt |
| reduction | 0.7× (F/8.3 → F/5.81) | 0.8× (F/8.3 → F/6.64) |
| EFL (model) | 8853.7 mm | 10114.6 mm |
| plate scale | 23.30″/mm · 0.233″/px (10 µm) | 20.39″/mm · 0.204″/px (10 µm) |
| design full field | 1.0° (image Ø 154.5 mm) | 0.9° (image Ø 158.9 mm) |
| KL6060 FoV (61.4 mm sq.) | 23.8′ × 23.8′ | 20.9′ × 20.9′ |
| corrector layout | cemented triplet + singlet + field flattener · 6 air-glass surfaces | cemented doublet + cemented triplet · 4 air-glass surfaces |
| glass path (axial) | S-FPL51 112 mm / S-BSL7 20 mm / S-BAL42 10 mm | S-FPL51 82 mm / S-BAL35 18 mm / S-BSL7 10 mm |
| corrector front behind M1 vertex | 434.2 mm | 520.0 mm |
| vs. rear flange (480 mm behind M1, unconfirmed) | corrector straddles it: S4 vertex 434 mm behind M1, glass extends to ~510 mm | corrector fully behind it: S4 vertex 520 mm behind M1 |
| largest lens Ø | 246 mm (clear aperture) | 228 mm (physical, drawing) |
| glass envelope length | 195.7 mm (clear apertures) | 140.9 mm (physical, drawing) |
| BFD (last vertex → image) | 79.36 mm | 91.61 mm |
| rim → image clearance | 51.6 mm at the OSLO clear aperture; no lens drawing available | 61.2 mm physical rim from the Objektiv drawing: concave surface polished to Ø 185, then a flat annular back face at 30.4 mm behind the vertex out to the Ø 210 rim |
| margin to CFW9-5 wheel front (OBFD 37.2 mm) | 14.4 mm | 24.0 mm |
| vignetting | corner vignetted by design: full illumination to ~0.467° (Ø 144 mm), ~70 % at the 0.5° corner | unvignetted: 100 % at the 0.45° edge, full illumination to 0.48° (with the physical apertures from the drawing) |
