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How we research

Updated

This page explains exactly how our guides are made, so you can judge how much weight to give them.

Our sources

  • Manufacturer documentation. Specifications such as field of view, eye relief, close focus, weight, capacity and waterproofing come from the maker's own spec sheets and manuals.
  • Independent expert reviews. We read reviews from established optics and birding publications and note where they agree and disagree.
  • Owner feedback. We look for patterns across verified owner reviews, such as recurring leaks, fogging or app problems, rather than quoting single opinions.
  • Ornithology sources. Bird facts come from sources such as the Cornell Lab of Ornithology, Audubon, the RSPB, BTO and national bird organisations in each market.

What we do not do

  • We have not physically tested the products in our guides, and we do not claim to. When we start hands-on testing, articles will say so clearly.
  • We do not invent testers, quotes, star ratings or statistics.
  • We do not accept payment for placement, and brands cannot buy a better position in a guide.
  • We do not publish prices, because they change daily. Use the "Check price on Amazon" buttons to see the current price.

How picks are chosen

We start with a real question, such as which binoculars suit glasses wearers. We build a long list of current products, check their specifications, remove anything we cannot verify, and compare the rest on the criteria that matter for that question. Every pick gets a "Best for" and a "Skip it if" line, because no product suits everyone. If we cannot verify a number, we leave it out.

Keeping guides current

Each article shows the date it was last updated. We revisit guides when products are discontinued or replaced, and when better information becomes available.

Corrections

If you spot an error, email info@perchandglass.com with the page address. We check every report, correct confirmed errors promptly and update the date on the article.

Illustrative images

Some images on this site are AI-generated illustrations, and each one is labelled "AI-generated illustration, not a photo". They show the kind of scene an article describes. They are not photographs of products we tested, and they should not be used to identify a species.