3.5X Fisheye Conversion Lens

Navitar's 3.5X Fisheye Conversion Lens (1-24207) is designed to work with lower cost projectors that do not have replaceable lenses. This is an ideal solution for planetariums that want to upgrade their existing systems, but can't afford to buy new projectors or replacement lenses. The new 3.5X Fisheye will also work in many applications where users simply want to project a very wide projector angle onto a curved screen, such as simulation, immersive environments, and amusement parks.

Features

• Allows many projectors to be used on a curved screen
• Even brightness from center to edge
• Lower pixel distortion at the corners
• Maximizes the pixel usage of the prime lens

Applications

• Planetariums
• Museums
• Immersive Environments
• Projection Tunnels
• Sark Rides
• Amusement Attractions
• Simulation

Navitar’s 3.5X Fisheye Conversion Lens is designed to turn most entry level, home grade, and professional projectors into fisheye solutions that help create immersive experiences. It’s the ideal solution for projectors without interchangeable lenses and for integrators who want to create a unique immersive experience without the cost of a full replacement HemiStar lens.

Active Image On a Dome Surface

When using a standard lens to project on a curved surface the image would cover the area indicated by the dark blue shading below. When used in conjunction with the 3.5X Conversion Lens the image would expand to the lighter blue areas. The magnified image is not limited to a flat surface. 

The magnified image is capable of focusing on a curved surface.  The illustration shows the range of converted angular sizes for a 4:3 image and a selection of prime lens throw ratios. At the widest range, a 1.3:1 prime lens can produce a 199°H x 125°V image (4:3 aspect ratio) with the 3.5X conversion lens, as seen below.

The 3.5X conversion lens provides remarkable value for installations where fisheye replacement lenses aren’t an option. Please use part number 1-24207 when ordering. 

Specification:

3.5X Fisheye Conversion Lens

• F#: 2.5
• Image Circle: 40 mm
• Max FOV: 200 degrees
• Focusing range from front of lens (m): 1.5m - Infinity
• Imaging Quality (%MTF): 55% Center @73lp/mm, 10% Edge @ 50lp/mm
• F-Theta Distortion: <-9.0% Max
• Transmittance: 89.8% Axis
• Relative Illumination: 80.5% Horizontal Field
• Relative Illumination: 89.6% Trans related
• Relative Illumination: 65.9% Dist. related
• Back Focus: TI 4K DLP