SLRs

SLRs is an acronym used in several fields. This article summarizes the main meanings in photography, climate science, banking, and research methods.

A single-lens reflex camera (SLR) uses a reflex mirror to direct light from the lens to an optical viewfinder. It offers through-the-lens viewing and interchangeable lenses. Film-era SLRs used photographic film; modern SLRs employ digital sensors. In recent years, many photographers have shifted to mirrorless systems, which omit the mirror while keeping interchangeable lenses and electronic viewfinders.

Sea level rise (SLR) denotes the long-term increase in the average height of the oceans, caused by thermal expansion and added water from melting ice. It is tracked by tide gauges and satellite altimetry. Projections depend on emissions scenarios and ice-sheet dynamics. Impacts include coastal flooding, erosion, and saltwater intrusion, prompting adaptation measures such as coastal defenses, land-use planning, and managed retreat where appropriate.

Statutory liquidity ratio (SLR) is a banking regulation requiring a portion of a bank’s liquid assets to be held to meet short-term obligations. The rule and its exact percentage vary by country; in some jurisdictions, it includes government securities and cash reserves. The SLR affects liquidity and the availability of credit.

Systematic literature review (SLR) is a methodical synthesis of research studies on a defined question. It follows a registered protocol, explicit inclusion criteria, and transparent data extraction. SLRs aim to summarize evidence, identify gaps, and inform policy, practice, and future research directions.