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Ernst Leitz Wetzlar Hektor f=20cm 1:2.5 projector lens Wetzlar
Height 10 cm 
Diameter 8 cm 
Condition: used, outer lens without scratches, rear lens has minor scratches and small dust particles - Other sizes can be seen in the photo 

Likely Coverage:

8x10" Negative: It is highly unlikely that a Leitz Hektor f=20cm 1:2.5 projection lens will fully cover an 8x10" negative, even at closer focusing distances. You would likely experience severe vignetting (darkening at the edges) and significant fall-off in sharpness towards the corners.
5x7" Negative: There's a possibility of coverage for 5x7", especially at portrait distances (around 1-2 meters). At infinity focus, it's less likely to have full coverage without significant vignetting. The sharpness at the edges might also be compromised.
Conclusion:

While it might be tempting to adapt a fast lens like the Leitz Hektor f=20cm 1:2.5 for large format photography due to its wide aperture, its design as a projection lens makes it unsuitable for full coverage of 5x7" and definitely not for 8x10" at infinity.

You might be able to get some interesting results for portraiture on 5x7" due to the potentially larger image circle at closer focusing distances and the shallow depth of field. However, be prepared for potential limitations in edge sharpness and possible vignetting.

If your primary goal is sharp, edge-to-edge coverage for 5x7" or 8x10" at various focusing distances, you would need to invest in lenses specifically designed for large format photography.

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Leitz Hektor f=20cm 1:2.5 Projection Lens

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Leitz Hektor f=20cm 1:2.5 Projection Lens

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