The Flea Market Petzval Lens

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The Revitalised Petzval lens

The lens was stripped down and the elements removed for cleaning at the same time the brasswork was cleaned.

Finally a set of Waterhouse stops were made from Aluminium sheet and painted matt
black, the interior of the lens barrel was also painted matt black at the same time.

Finally the lens was mounted to a lens board for a Speed graphic for tesing, the focal lenght was measured with the lens focussed at Infinity.

The Focal lenght is 8" - 200mm and it was then possible to calculate the full aperture - f4.8
and the apertures of the home made Waterhouse stops.

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