'Brevet d. invention s.g.d.g. - Derigy Opten - a Paris'

Dating Derogy lenses  is not so easy, still following the engraving, the lens can be dated in the early 1860ies.

This Convertible lens featured a unique bayonet system, which makes it easier to take out the front and the rear group., This way it is easier to use the front achromat part as a landscape lens. In this case the focal lenght is aprox. 600mm at F10.

Condition: The lens is in very nice condition, showing only minimal wear to the housing. The rack & pinion is complete and working quite well. The glass is in a good condition. There are some cleaning marks here and there, but overall clear and  shows a nice sharp image on the ground glass.

This lens has about 290mm focal lenght (11") and an open aperture of about F3.6. It will cover 8x10 and might even work for 10x12  format with quite some petzval character and vignietting especially at portrait distance.

Lens comes with a fitting flange.

height: 22cm
width: 10cm
weight: 1900gr

Insured and tracked shipping cost:

Germany - 20 eur
EU* - 30 eur
Worldwide - 90 eur

*(the site offers only 2 shipping variations, DE and worldwide. buyers from EU please either contact me beforehand for a reduced EU cost, or after buying so i can send a refund over the difference)

Importent Note: This item comes from my private collection and is around 100 years old (antique). I try my best to describe all the faults and major damage which are relevant for the function of this item. But the actuall item can show signs of wear and also some cosmetic blemishes/damage which is not described in the auction text! When buying this item the buyer agrees to this terms.