Methodology & sources
Three rules: every spec comes from the manufacturer's catalog, every page is dated, and nothing is invented.
Sources
- Manufacturer product catalogs (Sony, Canon, Nikon, Fujifilm, Sigma, Tamron) — focal length, maximum aperture, mount and coverage are taken from official product names and spec sheets.
- We deliberately do NOT store prices or weights — they change; check the retailer at purchase time.
What we never do
- No invented "ratings" or review scores — groupings reflect focal length and aperture facts, not opinions.
- No sponsored placements.
- No stale data presented as fresh — every page carries a "last verified" date.
Corrections
Spotted an error? Contact us with a link to the manufacturer page; corrections ship within days.