UV Objectives for CCD Cameras

For imaging applications in the UV a series of objectives is being built which feature high aperture ratios, excellent UV transmission and adequately high resolution. They are for imaging on scientific CCD cameras, image intensifiers or video cameras. In these objectives only synthetic lens materials (fused silica and CaF2) are used so that the transmission reaches the theoretical limit (about 160 to 180 nm as determined by the fused silica). In the IR too the transmission is limited by the fused silica, it ends around 3 µm with OH absorption bands at 1,3 µm (weak), 2,2 µm und 2,8 µm (strong). All lenses leave the polarisation properties of the light unaltered because only isotropic materials are used.
The objectives are optically corrected for a wavelength range from about 195 to 450 nm. In this wavelength range they are achromatic with a maximum variation of back focal length of 0.8 % of the focal length (resp. 0,25 % between 215 and 450 nm). The objectives are apochromatic in the wavelength range from 195 to 900 nm, their resolution does not degrade in the visible and near IR.
They are developed to produce an image in a finite field (e.g. onto a CCD chip or an image intensifier) and are suitable for image fields of 19 to 22 mm diameter.
As technical objectives the mountings are not equipped with internal focusing but are designed to be focused in their application setups or to be focused in photographic bellows; different focusing adaptors are available for all models. For the same reason they do not have internal variable f-stops.

UV Objective with 100 mm focal length - 50 mm free aperture - f:2

This objective is designed for one infinite conjugate m = β' = 0, i.e. focusing of parallel light. It employs 5 uncemented lenses (CaF2 and synthetic fused silica), and is delivered without AR coating as a standard. It is designed for an image diameter of 19 to 22 mm and detector pixels of 25 to 50 µm.
For finite imaging scales the quality of the objective changes only little up to 5:1 (M=β’ = -0.2; this is achieved with an imaging width of 720 mm object-image); for 2.5:1 (M = β’ = -0.4; imaging width of 490 mm) the image quality degrades significantly, particularly towards the edge of the imaging field.
We have available for this objective a drawing of the holder dimensions with some additional data about integration and about the optical quality, inclusive of a table with MTF values. Furthermore the cross section sketch is given at the top of this chapter.
The holder is cylindrical (Ø 60 mm x 89 mm) with two metric mounting threads for focusing tubes or bellows on the image side. One thread is M42x0.75 (like the photographic mount "T2", at the end of the holder) with about 53 mm distance from image to thread stop plane. The other thread is M52x0.75 (like the E52 photographic filter thread), about 93 mm seating distance (in the middle of the holder, tube diameter 48 mm till there). On the object side the holder has a filter thread M55x0.75 (E55 photographic filter thread). → OUC 2.50

As an accessory we can deliver a focusing tube for mounting the objective OUC 2.50 on various technical and scientific cameras. With two extension rings (8 mm, 16 mm) for higher magnification ratios
without camera adaptor ring  → MUC 2.50.0

Camera adaptor rings for

• C-Mount → MUC 2.50.1
• LaVision StreakStar → MUC 2.50.3
• DRS Hadland Imacon 486 → MUC 2.50.4
• PCO Dicam Pro → MUC 2.50.5
• LaVision IRO → MUC 2.50.6
• Roper Scientific PiMax → on request
• other cameras → on request

Extension rings (8 mm, 16 mm, 32 mm, 64 mm) for higher magnification ratios 
→ on request

UV Objective with 64 mm focal length - 32 mm free aperture - f:2

In its optical construction this objective resembles the type with 50 mm free aperture and as well employs 5 lenses (CaF2 and synthetic fused silica). Despite the higher field angles an image diameter of 19 to 22 mm could be achieved here too with a similar resolution as in the OUC 2.50.
→ OUC 2.32
It is most likely that the objective OUC 2.32 can be mounted in the focusing assembly OUC 2.50 with an objective adaptor ring, then it can be mounted on cameras with the camera adaptor rings MUC 2.50.x.
Adapter ring for focusing assembly → on request

UV Objective with 150 mm focal length - 60 mm free aperture - f:2.5

This objective is designed for a magnification ratio M = β' = -0.4, i.e. 2.5:1 imaging. It employs 5 uncemented lenses (CaF2 and fused silica Suprasil), and is delivered without AR coating as a standard. It is designed for an image diameter of 23 mm (detector pixels of 50 to 100 µm).
We have available for this objective a drawing of the holder dimensions with some additional data about integration and about the optical quality, inclusive of a table with MTF values.
The holder is cylindrical (Ø 70 mm x 199 mm) and has a metric mounting thread M62x1 with about 85 mm distance from image to thread stop plane at M = β' = 0.4. With filter thread M67x0.75 (E67) On the object side → OUC 3.60.4
For the objective OUC 3.60.4 is available a focusing assembly for mounting on an optical bench (drawing on request)
without camera adaptor ring→ MUC 3.60.0
Camera adaptor rings → see objective OUC 2.50
Extension rings (8 mm, 16 mm, 32 mm, 64 mm) for higher magnification ratios
→ on request

Available on special order

• Coatings:
  These objectives can be AR coated for single wavelengths or wavelength ranges. → on request
• Other focal lengths:
  We are currently considering a range of lenses like the type OUC 2.50 with other focal lengths. → on request
• Objective OUC 2.20 (f = 40 mm, f:2) → on request
• Individually designed UV objectives → on request