arri
14-Jun-2023, 14:48
Today I revised my Quarz glass lens, I have to change the position of the waterhouse stops to make it usable for 18x24cm/8x10"
It is a fused silica lens, made by Carl Zeiss in the 1990th. It were an element of the lithographic lenses Zeiss build for the chip exposuring.
It is an apherical lens so the focus length is a little bit difficult to messure but the extension at oo is 270mm and the used diameter ist max. 70mm (f/4.9)
For this sample I used a f/11 self made waterhouse blade.
The sharpness has is untypical, one reason is the not spherical corrected lens and the asperical surface.
The quarz glass let pass the UV light down to 185nm. The UM-MA has an UV sentivity of 320nm, I guess.
The Hanover company produced a similar lens in the early 1920th with the name Kalosat. It were a convex / concave miniscus lens. My lens is C/C as well but not so extreme.
Fujifilm X-Ray UM-Ma in 18x24cm
Sinar with rear lens shutter
1/2 sec., f/11
Wehner Developer
https://live.staticflickr.com/65535/52975472928_c676593e03_h.jpg
It is a fused silica lens, made by Carl Zeiss in the 1990th. It were an element of the lithographic lenses Zeiss build for the chip exposuring.
It is an apherical lens so the focus length is a little bit difficult to messure but the extension at oo is 270mm and the used diameter ist max. 70mm (f/4.9)
For this sample I used a f/11 self made waterhouse blade.
The sharpness has is untypical, one reason is the not spherical corrected lens and the asperical surface.
The quarz glass let pass the UV light down to 185nm. The UM-MA has an UV sentivity of 320nm, I guess.
The Hanover company produced a similar lens in the early 1920th with the name Kalosat. It were a convex / concave miniscus lens. My lens is C/C as well but not so extreme.
Fujifilm X-Ray UM-Ma in 18x24cm
Sinar with rear lens shutter
1/2 sec., f/11
Wehner Developer
https://live.staticflickr.com/65535/52975472928_c676593e03_h.jpg