Aren't there other issues concerning the image quality that haven't been addressed? I can think of:
(1) The enlarging lens must not only have the ability to transmit the UV radiations which are to expose the paper, it must have the ability to form a high quality, well-focused image in the wavelength range which is relevant.
(2) If the photosensitive paper has any appreciable sensitivity to wavelengths outside the UV range, for example to wavelengths in the visible range, then the enlarging lens must bring these other wavelengths to the same focus as the UV or else they must be excluded from the illumination.

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