TeleVue Filters " OIII Bandmate Type 2 filter (57798)

TeleVue OIII Bandmate Type 2 Filter (Model 57798)

The TeleVue Bandmate Type 2 OIII filter is part of a premium filter line designed to deliver consistent performance and precise manufacturing quality. Each filter is produced under strict quality control standards to ensure uniformity and reliability beyond typical market alternatives. All materials are sourced in Germany, and every filter undergoes multiple stages of testing to guarantee optical excellence and mechanical precision.

Each Bandmate filter is optically tested by TeleVue at high magnification to ensure that it introduces no image degradation. In addition, Astronomik verifies the coating performance using a spectrograph to confirm that it meets exact design specifications. Every filter is also mechanically checked for proper fit and cosmetically inspected for imperfections such as pinholes or surface defects. This comprehensive testing process ensures dependable performance for demanding observers and astrophotographers.

The OIII filter is a narrowband line filter specifically designed for observing emission nebulae. It transmits a very narrow 3 nm bandwidth centered at approximately 500 nm, corresponding to the doubly ionized oxygen (OIII) emission lines. By blocking nearly all other wavelengths, it significantly enhances contrast and reduces the effects of light pollution, making faint nebular structures easier to detect both visually and photographically.

Technical Specifications
Telescope connection: 2"
Frame size: 2"
Mount material: Aluminum
Optical coating: Multi-coated

General Information
Series: Bandmate Type 2
Type: Filter
Design: Line filter

Applications
Anti light-pollution: Yes
Suitable for astrophotography: Yes