Short description
Quick Overview
- Designed for Pentax LX camera systems.
- Interchangeable matte field for clear viewing.
- Includes 20mm scale for scientific measurement.
- Ideal for high-magnification and macro photography.
- Features precise horizontal and vertical markings.
- Ensures accurate composition for technical subjects.
- High-quality optical material optimizes brightness.
- Facilitates easy, accurate manual focusing.
- Quickly swaps with other Pentax screens.
- Essential tool for specialized photographic work.
Product Description
The Pentax SI-20 is a specialized interchangeable focusing screen designed exclusively for the Pentax LX 35mm SLR camera system. It features a fully matte surface that facilitates clear, unobstructed viewing across the entire frame, making it particularly effective for compositions where central focusing aids like split-image prisms might be distracting. The screen is treated with Pentax’s proprietary Clear-Bright-Matte coating, which significantly enhances light transmission and provides a brighter viewfinder image compared to standard ground glass, especially when using lenses with smaller maximum apertures.
Distinct from the standard SE-20 matte screen, the SI-20 is etched with horizontal and vertical scales calibrated in millimeters. These engraved reference lines are positioned across the matte field to assist photographers in determining exact subject size and magnification ratios. This makes the screen an essential tool for high-precision technical applications, including macrophotography, bellows work, and architectural photography, where geometric alignment and scale accuracy are paramount.
The SI-20 is part of a modular system that allows for user-level replacement through the camera's lens mount using a specialized pincette tool. Because the Pentax LX utilizes an Integrated Direct Metering (IDM) system—which measures light reflecting off the film plane rather than through the viewfinder—the installation of the SI-20 requires no exposure compensation. Its lightweight construction (approximately 1.3g) and precise dimensions (35 x 25mm) ensure a perfect fit within the LX's advanced viewfinder housing, maintaining the camera's professional-grade optical standards
| In The Box | "Pentax SI-20 Interchangeable Matte Focusing Screen, Pincette Tool, Storage Case" |
|---|---|
| Condition | Used |
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