Derogy 290 f4 petzval

What a patina for that old derogy lens. It has been used a lot and my test shots are incredibly sharp!

Lenses are clean, rack n pinions works smoothly.

No waterhouse stops slot because front is a bayonet that allows inside diaphragm. Easy system to use that avoid internal dusts.

Covers 8x10 with few falloff at infinity and nice petzval swirly bokeh. Perfect for portraiture works.